108 CXXXIII. ORCHIDEX (ROLFE). [Polystachya. 
side lobes triangular-oblong, obtuse; front lobe rather larger, ovate, 
obtuse; disc carinate, farinaceous, puberulous. Column stout, 1 lin. 
long. Chin saccate, obtuse, 24-3 lin. long.—Rolfe in Gard. Chron. 
1888, iii. 648. P. afinis, Lindl. in Bot. Reg. 1839, Misc. 35 (not of 
Gen. & Sp. Orch.); Reichb. f. in Walp. Ann. vi. 642. 
Upper Guinea. Sierra Leone: Barter ! cultivated specimen, Loddiges ! Sugar- 
loaf Mountain, common on mossy rocks and old logs on the higher part, Scott-Elliot, 
5822! Cameroons: Ambas Bay, Lord Scarborough. 
Lindley confounded this species with his P. affinis, and then redescribed P. affinis 
as P. bracteosa. 
2. P. farinosa, Kränzl. in Engl. Jahrb. xvii. 51. Plant 1-14 ft. 
high. Pseudobulbs cylindric, elongate, about 6-8-leaved. Leaves 
oblong, linear, bidentate, 3—5 in. long, 3—5 lin. wide. Racemes simple, 
many-flowered, 1}4—3 in. long. Bracts triangular, apiculate, 4—3 lin. 
long. Pedicels 4 lin. long. Flowers white. Dorsal sepal ovate-oblong, 
obtuse, 14 lin. long; lateral very shortly and broadly triangular, obtuse 
or apiculate. Petals elliptic-oblong, obtuse, 14 lin. long. Lip 34 lin. 
long, trilobed ; side lobes ovate-oblong, obtuse, small; front lobe con- 
duplicate and deeply keeled behind, oblong, obtuse; dise densely pul- 
verulous with an oblong keel above the base. Column stout, 1 lin. long. 
Chin oblong, obtuse, 3 lin. long. 
Upper Guinea. Cameroons: Mountains at 4000-5000 ft., Mann, 1339! 2115! 
Buea, 3500 ft., Preuss, 1064. 
3. P. bifida, Lindl. in Journ. Linn. Soc. vi. 129. Plant about 
1 ft. high. Stem elongate, cylindric, slender, about 5-6-leaved. 
Leaves linear, subobtuse, 24-43 in. long, 2-3 lin. broad. Racemes 
simple, erect or nodding, 1-1} in. long, 5—7-flowered. Bracts triangular, 
acute, }—} lin. long. Pedicels 3—4 lin. long. Dorsal sepal ovate, obtuse, 
concave, 14 lin. long; lateral broadly triangular, obtuse. Petals linear, 
obtuse, 14 lin. long, membranous. Lip linear-oblong, trilobed, 2} lin- 
long; side lobes oblong, obtuse, small; front lobe oblong, fleshy, con- 
duplicate, obtuse or tridentate, keeled below ; disc with a thick puberu- 
lous, apiculate cushion at the base. Column stout, ł lin. long. Chin 
saccate-oblong, obtuse, 24 lin. long.—Krinzl. in Engl. Jahrb. xxii. 23. 
Upper Guinea. Cameroon Mountains, Preuss! Fernando Po, 4000 ft., Mann» 
649! 
4. P. ensifolia, Lindi. in Journ. Linn. Soc. vi. 129. Plant 1-14 
ft. high. Stems subcylindric, elongate, slightly flexuous, 5—7-leaved. 
Leaves linear-lanceolate, acuminate, 2-8 in. long, 5-7 lin. broad. Scapes 
simple, or rarely slightly branched, erect or nodding, 14-2 in. long. 
Bracts triangular, acuminate, 14-2 in. long. Pedicels 2 lin. long. 
Flowers yellow. Dorsal sepal oblong-lanceolate, acute, concave, 2 lin- 
long; lateral triangular, acuminate. Petals spathulate-lanceolate, 
subacute, 1? lin. long. Lip hastately trilobed, 2 lin. long; side lobes 
triangular-oblong, subobtuse, short; front lobe obcordate-oblong, 
apiculate. Column stout, 1 lin. long. Chin saccate-oblong, obtuse, 
