Gleason: Centropogon and Siphocampylus 195 



II. 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 

 spreading, the lateral and ventral fissures usually progressively deeper than 

 the dorsal; filaments 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 ovarj- consequently mainly inferior. 



i. Flowers in leafy corymbs, leafy racemes, or solitary in the axils of normal 

 foliage leaves. 

 a. Anther-tube glabrous, except for the terminal brush, or with a few 

 scattered hairs only. 

 i. Flowers axillary, subtended by normal foliage leaves. 



* Sepals linear, exceeding the hypanthium; leaves much longer 

 than wide, 

 f Peduncles well developed, equaling or surpassing the 

 flowers, which exceed the subtending leaves. 

 % Leaves in whorls of three. 



io. Siphocampylus Orbigniaxus A. DC; DeCandolle, Prodr. 

 7: 405. 1839. 



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 herbarium material indicates that this is the 

 commonest Bolivian species of the two genera. It is distinguished 

 at once by its verticillate leaves. 



XX Leaves alternate, oblong or elliptic to linear. 

 § Corolla yellow or yellowish; leaf-blades linear to narrowly lanceolate, subentire, 

 undulate, or with minute spinulose teeth. 



11. Siphocampylus Kuntzeanus A. Zahlb. Bull. Torrey Club 



24:378. 1897. 

 Anther-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 linear-lanceolate, membra- 

 nous, flat. 



§§ Corolla red. 

 || Leaf-blades nairowly oblong-linear, narrowed below to an indefinite petiole, thick, 

 remotely denticulate. 



