GLEASON: CENTROPOGON AND SIPHOCAMPYLUS 195 
If. Corolla tubular, slender, straight or somewhat curved, usually constricted above 
its base, little if any wider at the throat than at the base: corolla-lobes linear or 
linear-deltoid and regularly tapering from base to apex, all erect or slightly 
th ; ments equaling or barely exceeding the dorsal petals; the two 
ventral anthers with a terminal brush of separate hairs; fruit capsular, so far 
as known 
A. Hypanthium well developed and the ovary consequently mainly inferior. 
I. Flowers in “a corymbs, leafy racemes, or solitary in the axils of normal 
fenced leave 
. An ie oe except for the sds: brush, or with a few 
attered hairs 
i. Ye lowers” sith. subtended by normal foliage leaves. 
* Sepals linear, exceeding the hypanthium; leaves. much longer 
than wide. 
{ Peduncles well developed, equaling or surpassing the 
owers, which exceed the subtending leaves. 
ft Leaves in whorls of three. 
10. SIPHOCAMPYLUS. ORBIGNIANUS. A. DC.; DeCandolle, Prodr. 
© G08. 1B39. ae 
Siphocampylus volubilis Britton, Bull. Torrey Club 19: 372. 
1892. 
Leaf-blades ovate to ovate-oblong, sharply and irregularly 
dentate; sepals filiform, much exceeding the hypanthium; corolla 
scarlet 
The wealth of hutbathitn material indicates that this is the 
commonest Bolivian species of the two genera. It is distinguished 
at once by its verticillate leaves. 
 ¥f{ Leaves alternate, oblong or elliptic to linear. 
§ Corolla. yellow or yellowish; leaf-blades linear to narrowly lanceolate, subentire, 
undulate, or with minute spinulose teet 
I. SIPHOCAMPYLUS KUNTZEANUS A. Zahlb. Bull. Torrey Club 
24: 378. 1897. 
er-tube surpassing the corolla; leaves neatly linear, 
crowded, conduplicate. 
12. SIPHOCAMPYLUS AUREUS Rusby, Mem. Torrey Club 6: 72. 
1896. 
Siphocampylus aureus latior A. Zahlb. Bull. Torrey Club 24: 
378. 1897. 
Anther-tube not exserted; leaves ttenc tinea membra- 
nous, flat. 
§§ Corolla red. 
|| Leaf-blades narrowly oblong-linear, narrowed below to an indefinite petiole, thick, 
remotely denticulate. 
