200 Gleason: Centropogon and Siphocampylus 



Filaments tomentose toward the summit; anther-tube pubes- 

 cent in lines; sepals equaling the hypanthium or a little shorter; 

 leaves crenate. 



34. Centropogon surinamensis (L.) Presl, Prodr. Monogr. 



Lobel. 48. 1836. 



Lobelia surinamensis L. Sp. PI. ed. 2, 1320. 1763. 



Filaments glabrous or with scattered hairs; anther-tube 

 sparsely hirsute or glabrous; sepals serrate, distinctly exceeding 

 the hypanthium: leaves denticulate. 



2. Sepals linear-triangular to ovate, with narrow acute sinuses; leaf-blades oblong- 

 lanceolate to lanceolate, usually sharply denticulate; flowers in terminal corym- 

 bose clusters. 

 * Sepals narrowly linear-triangular, entire, much longer than the hypanthium. 



35. Centropogon amplifolius Vatke, Linnaea 38: 716. 1874. 



** Sepals triangular-ovate to broadly ovate. 



36. Centropogon Bangii A. Zahlb. Bull. Torrey Club 24: 



372. 1897. 

 Sepals triangular-ovate, entire, shorter than the hypanthium. 



37. Centropogon roseus Rusby, Bull. N. Y. Bot. Gard. 8: 



123. 1912. 

 Sepals broadly ovate, foliaceous, denticulate. 



IV. Species of uncertain position, specimens of which have not been seen. 



38. Centropogon magnificus Zahlb. & Rechinger, Med. Rijks 



Herb. 19: 50. 1913. 

 Evidently a member of the first group of this conspectus; 

 compared by the authors with C. Mandonis Zahlb., from which it 

 differs in its fewer flowers on longer pedicels, straight-edged sepals, 

 denser pubescence on the corolla, obviously lignified twigs, and 

 stiffer rough leaves. 



39. Centropogon Herzogi Zahlb. & Rechinger, Med. Rijks 



Herb. 19: 49. 1913. 

 Evidently a member of the second section of this conspectus, 

 as indicated by the description of the corolla; flowers axillary, 

 hypanthium globose or subglobose, sepals short, acute, broadly 

 triangular, anther-tube glabrous, except the terminal tuft. 



