E. L. EKMAN, WEST INDIAN VERNONI.E. 41 



B. Leaves narrowed at base, strigose-pubescent beneath. 

 Guatemala Columbia. V. Friedrichsthalii. 



II. Outer scales not at all, or shortly, cuspidate. 



A. Leaves broad, elliptical, conspicuously narrowed at 

 base. 



1. Leaves velvety-pubescent beneath, especially on the 

 veins. Yucatan. V. hirsutivena. 



2. Leaves strigose-pubescent beneath. Central Brazil. 



V. virens. 



B. Leaves narrowly oblong to narrowly lanceolate, shortly 

 narrowed at base. 



1. Inner scales beautifully purplish, involucres 8 10 

 mm high. Mexico. V. strigosa. 



2. Inner scales not purplish. 



a. Heads distant, involucres about 7 mm high, 

 scales densely imbricated. Peru. 



V. argyrojiappa. 

 3. Heads approximated, about 6 mm high; scales 

 looselv imbricated. Eastern Brazil. 



V. Miersiana. 



Besides this, there are well-marked differences in the 

 structure of the flowers and the pappus. However, I have 

 had a rather scanty material to examine, and the differences 

 found thus cannot be published here. 



The names V. Friedrichsthalii and V. strigosa are not 

 to be considered as published in this paper. 



From V. Trinitatis, or some closely related species, V. 

 arborescens (L. ) Sw. may have originated. Especially the spe- 

 cimen collected by Lockhart greatly resembles this species. 



2. The allies of Vernonia arborescens (L.) Sw. 

 Yernonia arborescens (L.) Sw. 



Tabula nostra II, fig. 1 (cyma). 



Conyza arborescens Linn^us, 1759 a, p. 1213 ; 1763, p. 1209, excl. syn. 

 Brownei et Sloanei. 



Vernonia arborescens Swaetz, 1806, p. 1320, quoad typum Linn^i, haud 

 quoad descript., nee patriam. 



Lepidaploa arborescens Cass. ap. Lessing, 1829, p. 302 (ap. Cassini 

 1823, nomen non inveni), quoad typum Linn^i. 



Vernonia divaricata Lessing, 1829, p. 306 non Sw- 



