Gleason: Studies on West Indian Vernonieae 321 



I. Species of Santo Domingo; leaves oblong, very tomen- 

 tose beneath, rugose and scabrous above, narrowly 

 oblong, attenuate from the middle to a truncate or 

 subcordate base; inner involucral scales rounded and 

 apiculate at the tip. 

 II. Species of Cuba. 



A. Leaves thick, coriaceous, more or less revolute and 



shining above, oblong or ovate-lanceolate, 

 remotely dentate or entire. 



1. Heads 8-flowered; involucre cylindric. 



2. Heads with 18 flowers or more; involucre cam- 



panulate. 



a. Leaves narrowly oblong, at least three 



times as long as broad, entire, or with 

 numerous minute spinulose teeth. 



b. Leaves broadly oblong, about twice as 



long as broad, entire, or with a few 

 few remote but conspicuous teeth. 



* Scales of the involucre all erect or 



barely spreading, the inner acute, 

 the outer mucronate. 

 ** Outer scales conspicuously squarrose 

 or reflexed, all sharply acuminate or 

 subulate. 



B. Leaves thin or firm, but not coriaceous, flat, 



serrate, spinulose-denticulate, or entire. 



1. Leaves puberulent or glabrous beneath. 



a. Outer scales of the involucre short, acute 



or mucronulate, appressed. 



b. Outer scales of the involucre elongated, 



subulate, spreading. 



2. Leaves tomentose beneath. 



a. Middle involucral scales sharply acumi- 



nate, densely ciliate. 



b. Middle involucral scales rounded to a 



mucronate apex, or acute. 



* Inner scales obtuse or subacute; 



middle scales without scarious 

 margin; leaves entire or obscurely 

 spinulose-denticulate. 

 ** Inner scales apiculate; the middle 

 with a scarious margin. 

 Leaves narrowly linear-oblong, 



entire. 

 00 Leaves narrowly elliptic-oblong, 

 sharply serrate. 



Vernonia Sprengeliana. 



Vernonia purpurata. 



Vernonia Valenzuelana. 



Vernonia leptoclada. 



Vernonia Wrightii. 



Vernonia Sagraeana. 

 Vernonia aronifolia. 



Vernonia viminalis. 



Vernonia fallax. 



Vernonia aceratoides. 



Vernonia inaequiserrala. 



Vernonia Sprengeliana Sch.-Bip. The type specimen cited by 

 Schultz is Bertero 507 and the recent description by Gleason is 



