126 CXXXIII. ORCHIDE# (ROLFE). [Polystachya. 
green; keel of the lateral sepals dull purple; lip white with minute 
purple spots on the disc and a light yellow line between the side lobes. 
Sepals villous; dorsal ovate or ovate-lanceolate, acute, 3 lin. long; 
lateral triangular-ovate, acuminate, 4 lin. long, slightly keeled outside. 
Petals subspathulate-oblong, acute, 24 lin. long. Lip recurved, trilobed, 
2 lin. long; side lobes erect, semiovate-orbicular ; front lobe ovate, 
acuminate; disc with a slightly thickened line or obscure fleshy keel 
between the side lobes. Column stout, 4 lin. long. Chin saccate- 
oblong, obtuse, 14 lin. long. _ 
Mozamb. Dist. British Central Africa, cultivated specimen ! 
Described from a plant introduced by Mr. J. Buchanan, C.M.G., which flowered in 
the collection of Mr. James O’Brien, in 1890. Remarkable for its softly villous- 
pubescent inflorescence, and the colour of the flowers which resembles the pale green 
of some species of Sphagnum. 
58. P. dixantha, Peichb. f. in Gard. Chron. 1882, xvii. 294. 
Stem somewhat terete, 2-leaved, straight. Leaves linear-ligulate, acute. 
Peduncle with three yellow sheaths; rhachis velvety, lax-flowered ; 
racemes simple. Bracts triangular, shorter than the pedicels. Pedicels 
puberulous. Flowers ochre-coloured; lip with purple side lobes and 
dark yellow disc. Dorsal sepal linear-triangular; lateral triangular, 
acuminate. Petals linear-falcate, acute. Lip cuneate-dilated from a 
broad base, pilose; side lobes quadrate ; front lobe triangular, apicu- 
late; disc with an orange, semiquadrate callus in the upper part. 
Chin large, obtuse. 
West Tropical Africa. Without locality. 
Only known to me from the original description, but apparently near P, afinis, 
Lindl., which the flowers are said to equal in size. It flowered in the collection of 
Mr. T. Christy, in 1882. 
59. P. affinis, Lindl. Gen. d: Sp. Orch. 73 (not elsewhere). Pseudo- 
bulbs dorsally flattened, suborbicular, approximate, 1-1? in. diam., 
2-leaved. Leaves oblanceolate-oblong, acute or shortly acuminate, 
34-7 in. long, 1—14 in. broad. Scapes 6-12 in. high, villous ; racemes 
simple or a little branched, 4-7 in. long. Bracts ovate, acuminate, 
distichous, 4—6 lin. long. Pedicels 2 lin. long. Dorsal sepal ovate- 
oblong, subobtuse, 24-3 lin. long; lateral obliquely ovate-oblong, sub- 
obtuse. Petals subspathulate-oblong, subobtuse, 24—3 lin. long. Lip 
trilobed, 3-34 lin. long ; side lobes broadly rounded ; front lobe ovate- 
oblong, obtuse ; disc with a linear, fleshy keel, which is pubescent at 
the sides. Column stout, 14—14 lin. long. Chin saccate, 2 lin. long. 
—P. bracteosa, Lindl. in Bot. Reg. 1840, Misc. 48; Bot, Mag. t. 4161; 
Reichb. f. in Walp. Ann. vi. 642. : 
Upper Guinea. Sierra Leone, Don! cultivated specimens, Loddiges! Whit- 
field! near Wallia, Scott-Elliot, 46278! Ashanti: Brafu Edru, on trees, Cummins ! 
Lagos, Millen! Lower Niger: Onitsa, Barter, 1863! 
This species has been confused with P. leonensis, Reichb. f, 
60. P. ceespitifica, Kranz. in Engl. Pfl. Ost-Afr. C. 155. Plant 
scarcely 4 in. high. Pseudobulbs narrowly cylindrical, 1-leaved, densely 
