Gleason: Centropogon and Siphocampylus 197 



20. Siphocampylus gracilis Britton, Bull. Torrey Club 19: 374. 



1892. 

 Siphocamplyus corymbiferus gracilis A. Zahlb. Bull. Torrey 



Club 24: 384. 1897. 

 Leaves softly pubescent. 



iii. Flowers in crowded leafy racemes. 



21. Siphocampylos tupaeformis A. Zahlb. Ann. K. K. Natur- 



hist. Hofmus. Wien 6: 440. 1891. 

 Hypanthium hemispheric or somewhat urceolate, ribless or 

 faintly nerved; flowers 40-45 mm. long, approximately equaling 

 the ascending, straight or gently curved pedicels; leaves softly 

 pubescent beneath. 



b. Anther-tube conspicuously woolly in five strongly marked lines; leaf-blades lanceo- 

 late or broader, rounded at base; sepals much longer than the hypanthium, 

 which is strongly ribbed at maturity. 



* Leaf-blades long-acuminate, ovate-lanceolate to lance-oblong, sharply and 

 irregularly spinulose-denticulate. 



22. Siphocampylus argutus A. Zahlb. Bull. Torrey Club 24: 



383. 1897. 

 Leaf-blades thin, glabrous beneath, not prominently reticulate; 

 petioles straight or curved. 



23. Siphocampylus bilabiatus A. Zahlb. Bull. Torrey Club 



24:382. 1897. 

 Siphocampylus bilabiatus glabratus Lauterbach; Buchtien, 



Contr. Flora Bolivia 1: 187. 1910. 

 Leaf-blades firm, pubescent beneath, prominently reticulate; 

 petioles sigmoid. 



** Leaf-blades ovate-oblong, 5-8 cm. long, broadly rounded or subcordate at 

 base, obtuse or rounded at apex, minutely and remotely denticulate. 



24. Siphocampylus subcordatus Rusby, Bull. N. Y. Bot. 



Gard. 8: 121. 1912. 



2. Flowers in terminal, leafless, bracted racemes; pedicels flexuous in anthesis, 1 cm 

 long or less; hypanthium turbinate, strongly ribbed or subangulate, somewhat 

 constricted at the throat, equaling or exceeding the relatively short sepals; 

 calyx-sinuses broad. 



a. Hypanthium glabrous; leaf-blades falcate, conduplicate. 



