Polystachya subdiphylla
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Polystachya subdiphylla is a species of orchid native to Tanzania.
Taxonomy and history
P. subdiphylla was described by English botanist V. S. Summerhayes in 1942 based on a single specimen collected in 1935. It is placed in Polystachya sect. Cultriformes on the basis of its single-leaved pseudobulbs.[1][2]
Distribution and habitat
P. subdiphylla is known only from the Nguru and Uluguru Mountains in Tanzania.[3][4] It grows in montane forests around Template:Cvt above sea level.[2]
Description
P. subdiphylla is a herbaceous plant growing Template:Cvt tall. The conical pseudobulbs, each measuring Template:Cvt long and Template:Cvt wide, arise in clusters from a short, creeping rhizome. The leaves are lanceolate to ovate-lanceolate, measuring Template:Cvt long and Template:Cvt wide.[1] The inflorescence is a simple raceme measuring Template:Cvt long and bears up to 5 flowers. The flowers are mostly white, with red and yellow spotting on the labellum. The petals are obovate-lanceolate and measure Template:Cvt long and Template:Cvt wide. The dorsal sepal is lanceolate and measures Template:Cvt long and Template:Cvt wide. The lateral sepals are obliquely triangular and measure Template:Cvt long and Template:Cvt wide. The labellum is tri-lobed and strongly recurved, measuring Template:Cvt long and Template:Cvt wide with a covering of small hairs. The column measures Template:Cvt long.[2][4]
Conservation status
P. subdiphylla is listed as endangered by the International Union for Conservation of Nature under criteria B1ab(iii) and B2ab(iii), based on the small number of locations at which this species is present and the threat of habitat decline. P. subdiphylla is present within the Nguru South Forest Reserve, a protected area in the Nguru Mountains, however, other populations occur in unprotected areas that are at risk of deforestation due to agriculture.[3]
References
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