Polystachya.'] cxxxiii. orchide^ (rolfe). 113 



apiculate ; disc puberulous, with a central quadrate or roundish callus. 

 Column stout, 1 lin. long. Chin oblong, obtuse, 2J lin. long. 



nxozamb. Dlst. 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. Rivse, Schweinf. in Bull. Herb. Boiss. ii. ApjJ. ii. 88. Plant 

 6-16 in. high. Pseudobulbs aggregated, subcompressed, bicarinate, 

 not thickened below. Leaves 4-5, oblong-oval or oblong-linear, 4J-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: 



"Stile Iiand. Eritrea : Cliffs near Selet, below Saj^aneiti, 6500 ft., Sehioeinfurth^ 

 1272 ! 1686 ! Mt. Alamkale, near Aidereso, 5900 ft., Schweinf urth, 1809 ! 



18. P. paniculata, Rolfe. Pseudobulb oblong, stout, 3-4-leaved, 

 3-3J in. long. Leaves oblong, obtusely bilobed at the apex, 4-5J in. 

 long, 1^-11^ in. broad. Inflorescence paniculate, shortly peduncled, 

 with a pair of compressed, oblong, obtuse sheaths at the base, \\-l\ 

 in. long; panicle branches 1-1 J in. long, many-flowered. Bracts 

 subulate-lanceolate, J— J lin. long. Pedicels 1 lin. long. Sepals 

 lanceolate, acute, l}-lf lin. long; lateral rather broader. Petals 

 linear, acute, 1-1 J lin. long. Lip entire, ovate-oblong, acute, concave, 

 reflexed at the apex, 1^ lin. long ; disc with a small, rounded tooth 

 near the base. Column stout, \ lin. long. Chin shortly and broadly 

 rounded, \ lin. long. — Dendrohium paniculatum, Sw. in Schrad. Neues 

 Journ. i. 97 ; Pers. Syn. PI. ii. 523 ; Lindl. Gen. & Sp. Orch. 92. 



Upper Guinea. Sierra Leone, without precise locality, Afzelius ! 



19. P. odorata, Lindl. in Journ. lAnn. Soc. vi. 130. Stems erect 

 3-9 in. high, a little stouter at the base. Leaves lanceolate or lan- 

 ceolate-oblong, shortly or abruptly acuminate, narrowed below, 6-10 in. 

 long, 1-1| in. broad. Panicles 6-12 in. long, much branched above; 

 branches puberulous. Bracts subulate-acuminate from a broader base, 

 lJ-2 lin. long. Pedicels 2 lin. long. Flowers white, fragrant. Dorsal 

 sepal ovate-oblong, apiculate, 1 J lin. long ; lateral broadly ovate, 

 apiculate, 2|^-2| lin. long. Lip trilobed, 2 J 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. E 



