Scarlet (or not) Sophronitis: The Return of the Red Hots

SO-phro-NOT-Cattleyas

A very fine late summer display of Sophronitis mantiqueirae in the author’s California collection. Did I say “red hots”? This cool-growing species is visually stunning despite its small flower size.

Red is a color particularly prized by gardeners in general and orchid growers in particular. Those orchid genera that contain relatively high numbers of red-flowered species, such as Disa, Masdevallia, Epidendrum and Sophronitis, are extremely popular with collectors and breeders.

A nice 1990s vintage colchicine-treated Sophronitis coccinea in my collection in Guatemala. Even run-of-the-mill modern treated plants show a great improvement in flower quality when compared to 20 years ago.

Sophronitis sensu amplo (Laelinae) is a small (eight more or less accepted species), easily recognized orchid genus with mostly localized species that are endemic to the uplands of southeastern Brazi although one (S. cernua) ranges more widely into the lowlands of eastern Bolivia, Paraguay and northeastern Argentina. They are characterized by their compact growth habits with yellow, orange, red, pink or magenta-colored flowers emerging together with new leaves, globular or spindle-shaped pseudobulbs and very succulent foliage, often with a dark midstripe on the leaves. Most species originate from low to upper elevation cloud forests between ~2,000-7,500’/~600-2,300 m, where they grow as both lithophytes and epiphytes in moisture-drenched environments. The one outlier, again S. cernua, is primarily a lowland species that ranges from coastal mangrove forests to about 2,000’/600 m elevation in very warm, often seasonally dry ecosystems where they can form immense colonies on older trees under optimal conditions.

Another late summer flowering species in California, Sophronitis bicolor.

Long popular with orchid breeders because they impart red colors and compact growth habits to their offspring (including many of the so-called Mini-Catts), Sophronitis are the “Sophro-“ or Sophra-prefix and -onitis-suffix to some laeline nothogenera (i.e. generic names created to denote hybrid origin). Most species have flower colors that are some shade of red, although S. wittigiana is pink or pale magenta. Some of the better-known red-flowered species also have orange and yellow forms in cultivation, variously labeled as forma aurea, flava, xanthina and xanthoglossa as well as under archaic varietal names such a var. lobbii. As more line bred and imported plants enter cultivation outside of Brazil, small numbers of splash-color type flowers have also appeared in the trade. Crosses of improved yellow and red flowered forms of S. coccinea have appeared on the market of late, mostly from Japan, and some clones I have seen appear to blend these primary colors well.

The classic Sophrocattleya Batemaniana (Sophronitis coccinea x Cattleya intermedia) is a very early laeline hybrid made in 1881 at the Veitch Nurseries in England. This cross, first flowered in 1886, was used in many hundreds of subsequent hybrids. The Veitch Nurseries followed Sc. Batemaniana with a variety of other primary hybrids involving S. coccinea, such as Sc. Calypso (x C. loddigesii), Sc. Eximia (x Guarianthe bowringiana), Sc. Queen Empress (x C. mossiae) and Sc. Saxa (x C. trianae) (Veitch 1906).

In Volume III of “The Cattleyas and their Relatives” (1993), Carl Withner includes a quite good overview of the genus with sound cultural recommendations and a few very interesting photos; unfortunately with a couple questionable IDs and generally mediocre color renderings. At that time, the yellow-flowered forms of Sophronitis coccinea and S. cernua were exceedingly rare in cultivation outside of Brazil, so only one image of this variant was provided, incorrectly labelled “Var. flava”. He provides a detailed list of the varietal names known at the time (often just color forms), as well as subspecific names for plants that have been described as such.

Sophronitis coccinea f. flava ‘Yellow Bird’ x sib in the author’s collection. ‘Yellow Bird’ was also selfed by Japanese breeders and the offspring are generally very good.

Given their great beauty, diversity and native status, it is not surprising that they are extremely popular with Brazilian orchid collectors where they are known as Orquídeas Vermelhas. Famed British botanical illustrator Margaret Mee painted a number of Sophronitis species from life during her time there working for the Instituto de Botânica in São Paolo in the 1960s. In “Orchids of Brazil” (1993) Australian orchid collectors McQueen and McQueen covered a selection of species and varieties known in country at the time. Hopefully, more of the unique color forms and distinctive ecotypes available to contemporary Brazilian collectors will be imported to the U.S. in the near future. They are also favored by Japanese orchid breeders, which is the origin of many (most?) of the improved plants in U.S. cultivation. A casual perusal of images online shows many outstanding clones and distinctive ecotypes grown to perfection by growers in both countries.

A large flowered, very fine form of treated Sophronitis coccinea bred in Japan. Grower: Tom Perlite, Golden Gate Orchids.

Because of their rather small flowers in nature, since the 1980s they are often chemically treated at seed or seedling stage to try and induce polyploidy and its often-resultant added flower size and plant vigor. “Tetraploids” or “4n” is a bit of a misnomer since many plants as well as subsequent generations haven’t been tested for ploidy, so “treated” or “probable polyploid” is more accurate.

Among some very rare color forms seen in the rose or pink-flowered species, Sophronitis brevipedunculata and S. wittigiana do produce very pale, caerulea and albescens-types. The only flower of this shade that I have seen in life was of the former species and was – sadly - and despite having nice shape, a muddy shade of pale whitish-salmon. Withner (1993) shows an image of the very pale colored ‘Ericka’, awarded an AM by the AOS in 1967. Pure albino forms of S. wittigiana do appear on the market from time to time, mostly in the EU and Brazil; the ones I have seen for sale recently in northern Europe were very expensive. Fowlie (1968) reported a pale ecotype of S. mantiqueirae from the Pico do Cristal in Minas Gerais state as var. veronica with yellowish to salmon colored flowers.

Sophronitis coccinea treated x S. coccinea f. flava. Grower: Tom Perlite, Golden Gate Orchids.

Several species other than Sophronitis bicolor produce individuals with scarlet petals and sepals with bright yellow lips, commonly called var. xanthocheila. While often an extra attractive feature in the other taxa, this is probably best considered a striking color form than a true variety.

I currently grow all of the recognized species except Sophronitis pygmaea. I also have several of the more noteworthy color variants in my collection, but am still looking for good examples of the splash-petals, salmons and albas.

An awarded, tested tetraploid Japanese Sophronitis coccinea has the dubious distinction of being, and by a very wide margin, the most expensive plant that I have ever purchased. The small division was maladapted from the git-go but did flower twice before beginning a multi-year decline that I could not arrest despite best efforts. Needless to say, I have seen several better quality plants for less than half the price in the years following its untimely demise.

Other than larger flower size, one of the key tells indicating colchicine-treated Sophronitis coccinea and S. wittigiana as well as their offspring is the shape of the lip. Most of these plants have very round lips, as opposed to acute/acuminate or narrow spade-shaped lips seen on flowers of plants of wild origin and their untreated offspring

Shown above, two untreated Sophronitis coccinea in California with typically small (<2”/5 cm) flowers. Left, the author’s S. coccinea f. flava, purportedly imported from Brazil and of wild origin; and right, an anonymous grower’s S. coccinea f. rossiteriana.

A very free-flowering Sophronitis cernua flowering in the author’s home. While flowers are of average quality, this clone reliably produces six+ flowers per growth.

Most species other than Sophronitis cernua produce only one flower per growth, although I have clones of both S. coccinea and S. wittigiana that produce twin flowers per pseudobulb on a fairly reliable basis. In contrast, my best mature examples of S. cernua will invariably produce six to eight flowers per growth.

Although many very fine Sophronitis specimens have been grown in pots over the past hundred plus years, I follow many of my friends and acquaintances lead in growing them mounted. While somewhat more attention to care, especially watering and fertilization, is required I find the plants are overall more floriferous and healthier when grown on cork mounts or in durable wooden baskets. I have also grown them successfully on tree fern plaques in Guatemala, which is a popular option with some Brazilian collectors. Another option for those with space for permanent display and very large clones they can divide is a large, suspended cork tube or standing hardwood log. Both these options are also employed by some growers in Brazil and videos and images posted on the internet by them show that they can produce very fine table or bench displays when in flower.

The “correct” generic name for orchids discussed here as Sophronitis remains a subject of some debate among orchid specialists. The prevailing widespread use of the generic name Sophronitis is frowned upon by the orchid taxonomy wallahs and Kew’s The Plant List. The rationale for lumping it into Cattleya is provided in “New Combinations in the Genus Cattleya” (van den Berg 2008) and summarized in “The New Cattleyas” (Higgins and van den Berg 2010) as follows:

“Because Cattleya, as previously circumscribed, is paraphyletic to Sophronitis s.l., it would require the creation of many new genera for the various subgroups of Cattleya thus requiring new nothogenera for hybrids. A more practical (and simpler) solution is to lump all Sophronitis s.l. species with Cattleya and classify these groupings at the infrageneric level (subgenus, etc.). In this way, future infrageneric changes would not require further binomial changes, providing also nomenclatural stability for artificial hybrids of species in this alliance. Some species of the former Brazilian Laelia and Sophronitis had originally been placed in Cattleya and van den Berge (2008) has renamed the other species.” (emphasis mine).

Flower detail on a very full-flowered form of Sophronitis brevipedunculata.

The American Orchid Society (AOS) had already weighed in on this a year earlier:

“There are effectively two solutions; creation of new genera for the various subgroups of Cattleya or lump all Sophronitis species with Cattleya and deal with these groupings as subgenera or sections of a greatly expanded Cattleya. This latter solution provides better nomenclatural stability for artificial hybrids of species in this alliance since changes would not result in transfers to new genera….

…At the World Orchid Conference in January 2008, International Orchid Committee met to discuss the situation and, with input from the RHS Advisory Panel on Orchid Hybrid Registration (APOHR), the authors of the additional studies, the Orchid Hybrid Registrar (the Registrar), the AOS and editors of Genera Orchidacearum agreed that sinking Sophronitis into Cattleya would be a better approach over the long term.” (emphasis mine).

In other words, “What a pain in the ass it would be for the registrars at the RHS and AOS to leave Sophronitis as a separate genus.”

As an alternative to this route, a very knowledgeable and practical-minded acquaintance familiar with this debate recently suggested that a better option is to “freeze” nothogeneric names under seniority rules governing standard botanical nomenclature and resist the temptation to change generic names of orchids solely to suit horticultural, pragmatic or taxonomic whims.

Despite the fact that more than a decade has passed since the taxonomic opinion was published by Cássio van den Berg most nurseries and private collectors in the U.S., as well as many in the EU, are reluctant to observe the decision to move Sophronitis into synonymy with Cattleya. Indeed, more than 10 years after the fact it is rather rare to see them offered for sale as Cattleya species outside of Brazil. This stands in contrast to widespread acceptance of the name changes of other “natural genera” of laelines such as the Mesoamerican Guarianthe and Rhyncholaelia.

Noteworthy publication dates for the genus are as follows:

Sophronitis cernua - Lindley 1828

Cattleya coccinea - Lindley 1836

Sophronitis - Berg and Chase 2000

Hadrolaelia - Chiron & V.P. Castro 2002

Cattleya - van den Berg 2005 and 2008

At this time the generally accepted species are:

Sophronitis acuensis Fowl. 1975. One of the smaller species, in both plant and flower size. These are upper elevation plants from the Brazilian state of Rio de Janeiro. Some color variation evident, with some forms being faintly splash-petaled with pink or magenta overlaying orange or red ground colors. Late winter/early spring blooming in California

Shown above, two color forms of Sophronitis acuensis. Left, a very free-flowering clone grown by Cindy Hill. Right, a single flower on a young plant of the author with some magenta showing on the edges of the petals.

Sophronitis bicolor Miranda 1991. A robust, very showy-flowered species from Espírito Santo state, formerly considered a variety of S. coccinea. Plants have an open habit, elongated pseudobulbs and very showy single bright orange or red flowers with yellow lips held well free of the foliage on an elongated peduncle. Late summer blooming in California.

Sophronitis brevipedunculata (Cogn.) Fowlie 1972. A very beautifully flowered species formerly considered a variety of S. wittigiana from Minas Gerais, Rio de Janeiro and Espírito Santo states. Its pseudobulbs are clustered and nearly globular, much like those on S. wittigiana and some S. cernua. Flowers are held close to the plant and can be very handsome on the larger-flowered forms. This species is a late fall to early winter bloomer in California.

The very attractive clone of Sophronitis brevipedunculata flowering in the author’s collection. Shape and color show its affinities to S. wittigiana.

Nice form on a young example of the orange form of Sophronitis cernua.

Sophronitis cernua (including S. alagoensis and S. pterocarpa) Lindl. 1828. A very widely distributed species across much of eastern Brazil, northern Paraguay, Uruguay and northern Argentina. Easily grown and there are many improved plants, included colchicine-treated stock, are in collections. Mature plants hold from three to nine flowers per inflorescence, with young plants sometime throwing singles or twins. Fall and winter blooming in California. As is also the case in S. coccinea, an old, very large, well-flowered colony is a spectacular sight. Most plants have small, cupped, pale orange flowers with narrow segments, but there are increasing numbers of improved plants with better flower form and color on the market and in collections. Color variations include both pale pinkish orange and a variety of bright yellows tones. A California Mini-Catt breeder, Peter Lin, has used this small species frequently in complex hybrids to create a series of tiny, showy-flowered laeline hybrids that he calls Micro Mini-Catts.

Sophronitis cernua ‘Spring Hill’ x self in the author’s collection.

A very fine treated form of Sophronitis coccinea growing in NZ spagnum moss in a clay pot. Growers: Alek Koomanoff and Golden Gate Orchids.

Sophronitis coccinea (Lindl.) Rchb. F. 1868. The poster child for the genus and a large, select form in full bloom is one of the world’s most beautiful orchids. From intermediate to middle elevations in mossy forests of the states of Rio de Janeiro, São Paolo and Minas Gerais. They flower mostly from late fall to mid-winter in California and the single or twinned blooms can last for several weeks in good condition if kept cool and dry. Flower colors range from pale yellow through deep orange and scarlet, with varying amounts of yellow on the labellum. While some of the muddy orange colored forms known as var. rossiteriana can be disappointing in person, f. Borboleta with its orange and yellow-splashed floral segments are very attractive. Unfortunately for foreign growers, this color form is not commonly available outside of Brazil at this time. While there are rumors of flowers on treated S. coccinea approaching 4”/10 cm in diameter, the largest flowers I have grown in my collection were ~3.2”/8 cm in diameter. I have seen a couple flowers in and images with scale references that were almost 3.4”/8.5 cm across. “Wild” type untreated examples of the species are considered excellent if they have good form and color with anything much over a 2”/5 cm spread.

Sophronitis coccinea f. flava ‘P’ in the author’s collection. This is a very large yellow-flowered clone of the species with intense color, nice form and 3”/7.5 cm wide blooms. The product of careful line breeding in Japan, apparently untreated.

Sophronitis mantiqueirae (Fowlie) Fowlie 1968. Another fairly wide-ranging, small flowered and color variable species from southeastern Brazil, occurring mostly at intermediate to upper elevation cloud forests in the states of Rio de Janeiro and Minas Gerais. As mentioned earlier, some ecotypes have very pale colors in nature (var. veronica), while others have brilliant red flowers with yellow lips (f. xanthocheila).

A young Sophronitis mantiqueirae flowering in the summer in California. This clone was one of those sold as S. pygmaea.

Sophronitis pygmaea (Pabst) Withner 1993. Carved out of S. coccinea by Withner. In his description he mistakenly refers to it as the smallest member of the genus, which is actually the miniature, lowland ecotype of S. cernua from Alagoas state formerly identified as S. alagoensis. It is, however, the smallest of the “scarlet” Sophronitis species, with flowers mostly ~3/4”/2 cm in diameter. I am not familiar with this species in life. Some plants sold in the U.S. under this name in recent years were subsequently identified as S. mantiqueirae when they flowered.

Sophronitis wittigiana Barb. Rodr. 1878. Another of the standouts in a genus replete with beautifully flowered species, S. wittigiana (formerly known as S. rosea in the trade), have large, full, very flat flowers, in shades of vivid pink and often overlaid with darker contrast veins and giving them a pin-striped look reminiscent of some modern hybrid Phalaenopsis flowers. From low intermediate to upper elevations in Minas Gerais and Espírito Santo states, plants should be grown under intermediate conditions for best flower color and life. My experience is that plants must be kept on the dry side during winter flowering or blooms will blast in short order. Colchicine-treated plants and their offspring now dominate selections offered by U.S. and Japanese nurseries, but wild origin plants can also often be of high quality and the better forms are definitely worth having in one’s collection.

Two exceptional Sophronitis wittigiana clones grown in California. Left, plant grown by the author and right, a clone grown by Cindy Hill. Images: R. Parsons.

Cultivation:

I have been growing Sophronitis species for over 20 years, starting in Guatemala with early treated S. coccinea clones from Orchids Limited and some of the other species from Mountain Orchids and New World Orchids. Accessions beginning in 2011 in California have mostly been from Golden Gate Orchids, two Japanese nurseries and gifts from various friends in the San Francisco Bay Area.

A nicely-flowered Sophronitis coccinea of Japanese origin and from a treated flask growing in the author’s California collection. A sibling of this clone often produces twin flowers. Specimen-sized S. coccinea can remain in flower for almost two months as new growths continue to mature while older flowers fade. Note several near mature flower buds emerging from new leaves as they unfold.

Sophronitis species require medium to fairly bright light, cool nights, excellent ventilation and plenty of atmospheric moisture to thrive. Pure water is, unsurprisingly, a big plus. Exceptions are S. cernua and some ecotypes of S. wittigiana originating from the lower part of its elevational range. Species such as S. brevipedunculata, S. bicolor and S. coccinea do well grown intermediate to cool, and S. mantiqueirae and S. acuensis only thrive under very cool conditions. After having grown them for years in pots in a variety of media and mounted on treefern slabs and cork bark, starting in 2014 I have opted to grow almost all of my plants on cork bark. One exception is the large S. coccinea probable 4n shown growing horizontally on an 8”/20 cm hardwood slat mount. I have found these types of wooden mounts to be excellent for mounting orchids that tend to ramble horizontally at specimen size, particularly some of the larger laelines and Malesian bulbophyllums.

Light intensity, nighttime temperatures and RH seem to have a greater impact on the intensity of color in the red flowered forms of Sophronitis more than any other orchid that I have grown except for Dendrobium cuthbertsonii. Beyond attention to these details to try and provide optimum conditions for the plants, many S. coccinea and S. wittigiana clones – even large ones – definitely exhibit on and off year flowering as well, where both flower size and number will usually vary significantly.

A trio of Sophronitis coccinea f. flava flowers on a mounted plant during mid-winter in the author’s collection in California.

It is worth noting to novices that Sophronitis, like some other delicate laelines, seem prone to drop flowers if moved to a different environment prior to the blooms fully expanding.

Several growers I know have succeeded with small Sophronitis coccinea grown in well ventilated terraria, and Withner describes an exceptional example flowered in a clear plastic hat box on a north facing windowsill in New York. I’m confident that all of the species will thrive in modern Wardian cases equipped with advanced lighting, ventilation and misting systems using pure water.

I have been extremely fortunate in having grown these plants under near ideal conditions in both Guatemala and California so don’t consider them difficult to succeed with. The most challenging plants in the genus for me have been the yellow-flowered forms of Sophronitis cernua, both from PTC and seed-grown. Some of these f. aurea/flava seem to require uniformly warm conditions and are maddeningly prone to “two steps forward, one step back”-type vegetative growth until they have some size on them. This requires patience and a bit of trial and error to find the right spot for individual clones. My somewhat limited experience suggests that they also greatly resent transplant, so get them on a permanent mount as early as possible. My fingers are crossed that I will finally flower a good one very soon (September 2019).

A special thanks to Tom Perlite of Golden Gate Orchids, Ron Parsons and Cindy Hill for sharing rare plant material, their very valuable insights into growing these fabulous miniature orchids, and permission to use photographs and plants in their collections as models.

 

 

 

 

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