Polystachya. | CXXXIII. ORCHIDEZ (ROLFE). 113 
apiculate ; disc puberulous, with a central quadrate or roundish callus. 
Column stout, 1 lin. long. Chin oblong, obtuse, 24 lin. long. 
Mozamb. Dist. British Central Africa, cultivated specimen ! 
Described from a plant cultivated by Mr. J. O’Brien, who received it from Mr. 
J. Buchanan, C.M.G. It is usually marked by its dense panicle and imbricate 
bracts. 
17. P. Rivæ, Schweinf. in Bull. Herb, Boiss. ii. App. ii. 88. Plant 
6-16 in. high. Pseudobulbs aggregated, subcompressed, bicarinate, 
not thickened below. eaves 4—5, oblong-oval or oblong-linear, 44-6 ` 
in. long, 5-10 lin. broad. Peduncle longer than the raceme, clothed 
with 4-6 convolute sheaths. Bracts ovate, long cuspidate or sub- 
aristate, recurved, twice as long as the pedicels. Pedicels 3—4 lin. 
long. Flowers large, light yellow, nearly as broad as long. Sepals 
connivent ; lateral triangular-ovate, acute or apiculate, slightly keeled, 
6 lin. long, the gibbous base being 4 lin. long; dorsal oblong-ovate, 
acute or apiculate. Petals spathulate, as long as the dorsal sepal and 
scarcely half as broad. Lip shortly unguiculate, trilobed, as long as the 
lateral sepals, pubescent inside, yellow; side lobes connivent, broadly 
ovate, acute ; front lobe similar, but thickened and recurved ; disc convex. 
Capsule oblong-oval, rounded at the apex, shortly constricted at the 
base, 9 lin. long. 
Nile Land. Eritrea: Cliffs near Selet, below Saganeiti, 6500 ft., Schweinfurth, 
1272! 1686! Mt, Alamkale, near Aidereso, 5900 ft., Schweinfurth, 1809 ! 
18. P. paniculata, Rolfe. Pseudobulb oblong, stout, 5—4-leaved, 
3-34 in. long. Leaves oblong, obtusely bilobed at the apex, 4—54 in. 
long, 14-14 in. broad. Inflorescence paniculate, shortly peduncled, 
with a pair of compressed, oblong, obtuse sheaths at the base, 13-2} 
in. long; panicle branches 1-1} in. long, many-flowered. Bracts 
subulate-lanceolate, }-1 lin. long. Pedicels 1 lin. long. Sepals 
lanceolate, acute, 13-1? lin. long; lateral rather broader, Petals 
linear, acute, 1-1} lin. long. Lip entire, ovate—oblong, acute, concave, 
reflexed at the apex, 14 lin. long; disc with a small, rounded tooth 
near the base. Column stout, } lin. long. Chin shortly and broadly 
rounded, 4 lin, long.—Dendrobium paniculatum, Sw. in Schrad. Neues 
Journ. i. 97; Pers. Syn. Pl. ii. 523; Lindl. Gen. & Sp. Orch. 92. 
Upper Guinea. Sierra Leone, without precise locality, Afzelivs ! 
_ 19. P. odorata, Lindl. in Journ. Linn. Soe. vi. 130. Stems erect 
9—9 in. high, a little stouter at the base. Leaves lanceolate or lan- 
ceolate-oblong, shortly or abruptly acuminate, narrowed below, 6—10 in. 
long, 1-13 in. broad. Panicles 6-12 in. long, much branched above; 
branches puberulous. Bracts subulate-acuminate from a broader base, 
13-2 lin. long. Pedicels 2 lin. long. Flowers white, fragrant. Dorsal 
sepal ovate-oblong, apiculate, 13 lin. long; lateral broadly ovate, 
apiculate, 24-23 lin. long. Lip trilobed, 24 lin. long ; side lobes oblong, 
obtuse, slightly curved; front lobe orbicular or broadly obovate- or 
obcordate-oblong ; disc nearly pubescent, with a linear keel from the 
VOL. VII. I 
