Satyrium coriophoroides A.Rich., Ann. Sci. Nat., Bot., II, 14: 274 (1840).
Satyrium macrostachyum Hochst. ex A.Rich., Tent. Fl. Abyss. 2: 298 (1850).
Satyrium coriophoroides var. sacculatum Rendle, J. Bot. 33: 295 (1895).
Satyrium sacculatum (Rendle) Rolfe in D.Oliver & auct. suc. (eds.), Fl. Trop. Afr. 7: 266 (1898).
Satyrium gilletii De Wild., Not. Pl. Util. Congo 1: 153 (1903).
Satyrium stolzii Kraenzl., Bot. Jahrb. Syst. 48: 388 (1912).
A terrestrial herb 4-10 dm. high, glabrous except for the roots; tubers ellipsoid to fusiform, 3-5.5 cm. long, 1-1.5 cm. in diameter, ± tomentose; roots slender, flexuous, pubescent. Sterile stem to 5 cm. high, 4-5-leaved; lower 2-3 leaves sheath-like, obtuse, the upper 1-2 lanceolate to elliptical-lanceolate, acute, up to 7-16 cm. long and 2.5-4.5 cm. broad. Fertile stem slender to rather robust, almost covered by adpressed sheathing leaves; sheaths 10-15, lanceolate, acute, up to 4-10 cm. long and 1-3 cm. broad. Inflorescence narrowly cylindrical, 8-23 cm. long, 1.5-2.5 cm. in diameter, rather densely many-flowered; bracts soon reflexed, lanceolate, acute, 1-2.5 cm. long. Flowers curved outwards, sessile, white to crimson-red; ovary ± 5 mm. long. Sepals and petals deflexed and ± rolled-up, united to one another and to the lip in their basal fourth; intermediate sepal oblong-elliptical, rounded, 5-6.5 mm. long, ± 1 mm. broad; laterals very obliquely elliptical-oblong, obtuse, equalling the intermediate, 1.5-2.-5 mm. broad, 2-veined. Petals oblong-oblanceolate, rounded, 4.5-6 mm. long, 0.-1 mm. broad, margins ± ciliolate, I-veined. Lip almost globular, with a narrow mouth, the apex shortly reflexed, 5-7 mm. long ; spurs parallel to the ovary, 11-17 mm. long, 1-2 mm. in diameter. Column inside lip, much curved, 3.5-5 mm. high; stigma erect, transversely elliptical, 1.5-2 mm. high, 2-3 mm. broad, rostellum porrect, 3-lobed, the side lobes short, tooth-like, the middle lobe a little longer, triangular, very fleshy.
Grassland, and at edge of woodland, dambo 1400–2300 m.
Satyrium sacculatum was separated from Satyrium coriophoroides by having spurs 8.5–10.5 mm long, as opposed to 11–17 mm; by usually having a pair of additional spurs whereas Satyrium coriophoroides never does; by rarely having white flowers rather than often white and by the mid-lobe of the rostellum being much longer, rather than slightly longer than the side lobes. The characters are not consistently linked, for example plants in Malawi which otherwise agree with Satyrium sacculatum have spurs 13–15 mm long.
As given for the genus, cool to cold growing, glabrous terrestrial.
Cameroon, the Democratic Republic of Congo (Zaire), Ethiopia, Kenya.
Orchidaceae of West-central Africa, vol. 1, Gdansk University Press Gdansk 2010; Orchids of East Africa Piers 1968; Flora of Tropical East Africa Orchidaceae Part 1 Summerhayes 1968; Orchids of South Central Africa Williamson 1977; Flora Zambesiaca Vol. 11 Part 1 Orchidaceae Pope 1995; Orchids of Kenya Stewart & Campbell 1996; Field Guide to the Ethiopian Orchids Demissew, Cribb & Rassmussen 2004; Field Guide to the Ethiopian Orchids Demissew, Cribb & Rassmussen 2004; Flora of Tropical Africa Vol 7, page 12, (1898) Author: (By R. A. Rolfe.); African Orchids: XXX V. S. Summerhayes, Kew Bulletin, Vol. 20, No. 2 (1966), pp. 165-199
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