Oncostemma. | LXXXY. ASCLEPIADEE (BROWN). 412 
lin. long, lanceolate, acuminate, ciliolate. Corolla about } in. in aiam., 
campanulate-rotate or subrotate, 5-lobed to three-fourths of the way 
down ; tube ventricose 1-1} lin. long; lobes elliptic-ovate, obtuse, 
glabrous, green outside, brownish inside. Outer coronal-lobes minute, 
deltoid, fleshy, united into a ring at the base; inner corona a thick 
fleshy ring, about half 2s long as the } lin. long staminal-column.— 
K. Schum. in Engl. Jahrb. xxiii, 235, and in Engl. & Prantl, Pflazenfam. 
iv. ii. 297; Henriques in Bolet. Soc. Brot. x. 165. 
Upper Guinea. Cameroons: near Yaunde, Zenker, 665. 
Lower Guinea. Island of St. Thomas: near Batepa, 1750 ft., Moller, 99. 
35. NANOSTELMA, Baill. Hist. Pl. x. 247. 
Flowers minute. Corolla subeampanulate, 5-lobed ; lobes narrowly 
overlapping. Corona annular, thick, obtusely 5-crenate, surrounding 
the short and thick staminal-column under the anthers, Anthers 
terminated by an inflexed membrane, Style capitate, papillose, with 
the vertex depressed. Follicles narrowly linear, acute, glabrous.—A 
perennial glabrous herb, with knotted rhizome and erect stems. 
Leaves opposite, sessile, lanceolate. Flowers lateral at the uppermost 
nodes, in long-peduncled lax racemose cymes, and forming a compound 
terminal raceme. 
An endemic genus of one species, not seen by me. 
1. N. congolana, Baill. Hist. Pi. x. 248. Name only, no descrip- 
tion beyond the above.—J. congolanum, K. Schum, in Engl. & Prantl, 
Ptianzenfam. iv. ii. 248. 
Lower Guinea. Congo. 
36. SPH HROCODON, Benth. in Benth. et Hook. f. Gen. 
ei, th i Lee 
Calyx 5-partite. Corolla campanulate or subcampanulate, 5-lobed ; 
lobes overlapping and slightly twisted to the left in bud. Corona of 5 
small fleshy compressed tubercles or teeth, radiating or ascending 
from the staminal-column some distance above its base. Staminal- 
column arising from the base of the corolla; anthers erect, obtuse, 
without appendages. Pollen-masses erect, solitary in each anther-cell, 
not very minute, united in pairs by very slender caudicles to the minute 
and rather thin pollen-carrier. Style shorter than the anthers, trun- 
cate and shortly 5-rayed at the apex.—Perennial herbs with a woody 
or tuberous rootstock. Stems erect, not twining, Leaves opposite, 
shortly petiolate, elliptic or oblong. Flowers of moderate size, in 
pedunculate sublateral umbel-like cymes. 
Species 2, one of which is also found in Natal. 
This genus differs from Tylophora in its dwarfer erect habit, unbranched in- 
florescence with numerous bracts, compressed coronal-lobes and much larger and 
more oblong pollen-masses. 
