124 CXXXIII. ORCHIDEE (ROLFE). | Polystachya. 
broad claw; side lobes rounded-auriculate, erect, retrorse; front lobe 
ovate, obtuse; disc with a slender, transverse callus near the base and 
a few short hairs behind. Column stout, ł lin. long. Chin saccate- 
oblong, obtuse, 2 lin. long.—Reichb. f. Xen. Orch. iii. 9, t. 207, fig. 1. 
P. polyglossa, Durand & Schinz, Conspec. Fl. Afr. v. 36. 
Upper Guinea. Sierra Leone, cultivated specimens! 
Only known to me from the original specimen, which flowered at Kew in 1872. It 
seems most allied to the South African P. pubescens, Reichb. f. 
52. P. zambesiaca, Rolfe in Kew Bulletin, 1895, 192. Pseudo- 
bulbs elliptical or elliptic-oblong, subcompressed, 2—3-leaved, 5—9 lin. 
long. Leaves oblong or lanceolate-oblong, subobtuse, conduplicate at 
the base, glaucous and carinate beneath, 14-3} in. long, 3-7 lin. broad. 
Scapes pubescent, 4—8-flowered, 2~3 in. long. Bracts broadly rhomboid- 
ovate, acuminate, pubescent, 2-3 lin. long. Pedicels 4 lin. long. 
Flowers greenish-yellow, with a deep brown spot on the front of the 
column, and some light purple veining on the side lobes of the lip. 
Sepals triangular-ovate, acute; dorsal + lin. long; lateral broader 
than the dorsal, carinate, 5 lin. long. Petals linear-oblong, bidenticu- 
late, incurved, 3 lin. long. Lip recurved, trilobed; side lobes erect, 
rotundate; front lobe ovate, obtuse, 3 lin. long; disc with a broad, 
oblong, pubescent callus. Column stout, 1 lin. long. Chin saccate- 
oblong, 2 lin. long. 
Mozamb. Dist. British Central Africa, cultivated specimen! 
Described from a plant sent from British Central Africa by Mr. J. Buchanan, 
C.M.G., and fiowered in the collection of Mr. James O’Brien in 1894. 
53. P. Johnstoni, /olfe. Plant 3-4 in. high. Pseudobulbs sub- 
globose, 7-8 lin. long, 3—4-leaved. Leaves oblong, obtuse or emarginate, 
recurved, 13-2} in. long, 6-8 lin. broad. Scapes subcompressed or 
ancipitous, whole inflorescence and flower villous, 2-3 in. long ; racemes 
1-1} in. long, many-flowered. Bracts triangular-ovate, acute, spreading 
or recurved, 2-2} lin. long. Pedicels 3 lin. long. Dorsal sepal ovate- 
lanceolate, acute, 5 lin. long ; lateral triangular-ovate, carinate. Petals 
faleate-lanceolate, acute, + lin. long. Lip 34 lin. long, trilobed, reflexed ; 
side lobes reniform-orbicular; front lobe elliptic-ovate, acute; disc 
villous, with a transverse fleshy tubercle at the base of the front lobe. 
Column stout, 1} lin. long. Chin saccate, obtuse, 24 lin. long. Capsule 
oblong, 8-9 lin. long. 
Mozamb. Bist. British Central Africa: Mt. Mlanje: Lukubu and Palombi 
gorges, 4000 ft., MeClounie, 34! Futchila ridge, in open unshaded places, 7500 ft., 
“found on a ‘ Yucca’ stem, in large clumps, small bulbs thickly together,” Me Clounie, 2 
54. P. lawrenceana, Kränzl. in Gard. Chron. 1898, xiv. 150. 
Pseudobulbs subglobose. Leaves linear-oblong, acute, 34 in. long, 1 in. 
broad. Scapes 4-6 in. long, puberulous ` racemes simple, few-flowered, 
distichous. Bracts large, rhomboid, acute, two-thirds as long as the 
pedicels, puberulous; apex reflexed. Flowers about 7 lin. diam. 
Dorsal sepal oblong, acute ; lateral very broadly triangular, acute, 
carinate, yellowish-green. Petals as long as the dorsal sepal, linear- 
