Family : Orchidaceae
Text © Prof. Pietro Puccio
English translation by Mario Beltramini
The species is native to Madagascar, Mauritius and Réunion where usually grows in the humid forests on rocks covered by vegetable debris and moss, less frquently as epiphyte on the trees, from the sea level up to about 1700 m of altitude.
The name of the genus is the combination of the Greek substantives “κύων, κυνός” (cyon, cynós) = dog and “ὄρχις” (orkis) = testicle, with reference to the shape of the tubers; the specific name is the Latin adjective “purpurascens, entis” = tending to purple, with reference to the colour of the flowers.The Cynorkis purpurascens Thouars (1822) is a terrestrial species, epiphyte at times, deciduous, with two pubescent oblong fleshy tubers and one, rarely two, ovate-lanceolate basal leaves with acute apex and entire margin, 20-45 cm long and 4-12 cm broad, fleshy, developping usually the same time as the inflorescence.
Racemose terminal inflorescence, compact, on an about 25 cm long erect peduncle, bearing up to more than 30 flowers, on a pedicel and ovary 2,5-4 cm long, of pale pink to purple colour, of about 2,7 cm of diameter; is present in nature also in an albino form.Oblong dorsal sepal with acute apex, concave and curved on petals and column, about 1 cm long and 0,9 cm broad, oblong-falcate lateral sepals with obtuse or acute apex, horizontal, about 1,3 cm long and 0,6 cm broad, lanceolate petals, 0,6-0,8 cm long and 0,2-0,4 cm broad, trilobed labellum, 2-2,6 cm long and broad, lateral lobes with truncated and irregularly serrate apices and bifid median lobe with irregularly serrate apices; at the base of the labellum is present a 3-3,5 cm long spur.
The species is self-pollinating.
At amateur level it reproduces by division of tillered plants. Little cultivated species that should deserve a greater diffusion due to the long lasting blooming, of some months.
Deciduous, requires medium-high temperatures, 22-30 °C, when in vegetation, slightly cooler during the rest period.
The watering regime must carefully follow the trend of the vegetation, at the vegative restart, in spring, gradually begin the waterings, paying particular attention not to leave water on the emerging leaf, in order to maintain the substratum constantly humid, but without stagnations, at the end of the cycle, when the leaf falls, the waterings are to be suspended maintaining the substratum only just humid.
It is usually cultivated in pot with organic loam particularly draining and aerated, to renew frequently being the tubers easily subject to rottenness when the substratum tends to deteriorate.
Fertilizations, during the vegetative period, duly alternated with the waterings to avoid salts accumulations, utilizing a hydrosoluble balanced fertilizer, with microelements, at 1/5 the dosage, or less, than what suggested on the package.
The species is reported in the appendix II of the CITES (species whose trade is internationally ruled).