Gleason: Centropogon and Siphocampylus 193 



3. Siphocampylus Vatkeanus A. Zahlb. Bull. Torrey Club 24: 



377- 1897- 

 Sepals little exceeding the hypanthium; leaf-blades oblong- 

 lanceolate, 6-10 cm. long, 2-3 cm. wide, acuminate, tomentose on 

 the reticulate veins beneath, obtuse or rounded at base, on petioles 

 1-2 cm. long. 



2. Anther-tube white-woolly. 



4. Siphocampylus radiatus Rusby, Mem. Torrey Club 6: 73. 



1896. 

 Sepals 20-25 mm. long, 3-4 mm. wide, somewhat dilated 

 below; leaf-blades lanceolate, 15-25 cm. long, acuminate, flat 

 above, not conspicuously reticulate, gradually narrowed below to 

 an indefinite petiole or sessile base. 



4a. Siphocampylus radiatus minor A. Zahlb. Bull. Torrey 

 Club 24: 376. 1897. 

 Plant smaller in all its parts; pedicels surpassing the leaves. 



B. Hypanthium short-cylindric, higher than broad when pressed, or depressed- 

 hemispheric; corolla-lobes usually shorter than the tube; anther-tube densely 

 woolly; fruit baccate, so far as known. 



I. Sepals linear or narrowly lanceolate, four to ten times as long as broad, longer 

 than the short-cylindric hypanthium, equaling or exceeding the corolla-tube, 

 with rounded sinuses nearly or quite as broad as the sepals; leaf-blades 

 large, elliptic, 15-25 cm. long. 



5. Cextropogon incanus (Britton) A. Zahlb. Bull. Torrey 



Club 24: 374. 1897. 

 Siphocampylus incanus Britton, Bull. Torrey Club 19: 373. 



1892. 

 Petals and sepals densely floccose with yellowish gray hairs; 

 filaments little exserted, the anther-tube barely surpassing the 

 corolla; leaf-blades 5-10 cm. long, abruptly acuminate, floccose 

 below and somewhat so above. 



6. Centropogon Brittonianus A. Zahlb. Bull. Torrey Club 



24: 373. 1897. 

 Siphocampylus giganteus latifolius Britton, Bull. Torrey Club 



I9:373- 1892. 

 Petals and sepals thinly pubescent; filaments long (2 cm. or 

 more) -exserted; leaf-blades 4-7 cm. broad, gradually acuminate, 

 thinly tomentose on the veins beneath, puberulent above. 



