Tridactyle virgula (Kraenzl.) Schltr., Beih. Bot. Centralbl. 36(2): 148 (1918).
Angraecum virgula Kraenzl. in H.G.A.Engler (ed.), Pflanzenw. Ost-Afrikas, C: 157 (1895).
Listrostachys virgula (Kraenzl.) Rolfe in D.Oliver & auct. suc. (eds.), Fl. Trop. Afr. 7: 165 (1897).
Plants with stems in tufts, curved and rarely blanched, occasionally several metres long but usually 10-65 cm long, with smooth roots. Leaves linear, unequally bilobed at the apex, 9-16 cm long, 3-5 mm wide. Inflorescences 4-5 mm long, 2- to 4-flowered. Flowers greenish white or whitish; dorsal sepal ovate-elliptic, acute, 3-3.7 mm long, 1.6-2.2 mm wide; lateral sepals obliquely ovate, acute, 3.2-4 mm long, 1.9-2 mm wide; petals oblonglinear, acute, 2.5-3.6 mm long, 1-2 mm wide; lip cuneate below with fleshy auricles, 3-lobed in the apical part, side lobes spreading, short, subacute, mid-lobe slightly longer, acute, in total 2.5-3.3 mm long, 1.5-2.5 mm wide; spur decurved, slightly inflated at the apex, 8—12 mm long.
Epiphyte in undergrowth of montane forests; 1770-2500 m; flowering April to May and in September.
As given for the genus, cool to cold growing epiphyte.
E. Zaïre to Uganda
Angraecoid Orchids Stewart, Hermans and Campbell 2006; World Checklist of Monocotyledons. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/monocots/ accessed 21.03.2017
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