236 GLEASON: TAXONOMIC STUDIES IN VERNONIA 
Minnesota, the Ohio State University, and the University of Wis- 
consin for the loan of material; to the directors or curators of the 
Brooklyn Botanic Garden, the Gray Herbarium, the National 
Herbarium, the New England Botanical Club, and the Phila- 
delphia Academy of Sciences for the facilities of their herbaria and 
libraries; to Dr. B. L. Robinson, Dr. J. M. Greenman, Mr. W. 
R. Maxon, and Mr. E. E. Watson for information, assistance, and 
criticism; and especially to the University of Michigan, where 
part of the work was done. 
VERNONIA BORINQUENSIS Urban 
In describing the species, Urban took as the type a form with 
hirsute achenes, resinous-dotted leaves, and short straight ap- 
pressed hairs on the lower leaf surface. This is the commonest 
form in American herbaria. Urban’s variety Stahlit covers a 
much rarer form with glabrous achenes and without resinous dots 
on the leaves. Two other forms also occur, which are deserving of 
varietal names. 
Vernonia borinquensis resinosa var. nov. 
Achenes glabrous; leaves conspicuously dotted with glands and 
resin on the lower surface: otherwise like the typical form of the 
species. 
TYPE: ex herb. E. W. D. Holway, collected at Cayey, Porto 
Rico, January, 1911, and deposited in the herbarium of the New 
York Botanical Garden. 
Vernonia borinquensis hirsuta var. nov. 
Achenes hirsute; leaves densely sericeous-hirsute beneath — 
with bent or curved hairs 2-4 mm. long, nearly or completely 
concealing the resinous dots; citherwiek like the typical form of the 
species. : 
Tyre: Britton, Stevens, & Hess 2471, collected in a wooded 
valley, Rio de Maricao, Porto Rico, at an altitude of 500-600 : 
meters, April 2, 1913, and deposited in the herbarium of the New . 
York Botanical Garden. Field notes indicate that it is a vine, 2 
two meters long. 
The species and its three varieties may be distinguished 45 — 
follows: 
