Vernonia.] COMPOSITAE. 191 
Heads radiate, heterogam a 
pene paleacoout; leaves opposite : 
Pappus w Pit 
Inner brace - involucre spinescent e ‘ 12. Acanthospermum. 
Outer Festa of invol. ovate or 0 13. Eel 
oblon. 
Outer bracts of invol. linear, spreadin oe glandu 14, Stegesbeckia. 
Pappus of 1—4 short paleaceous awns; base of aa sae 16. Lipochaeta. 
Pappus of 1—5 retrorsely barbed or ee awns or bristles: 
Achene beaked 
ne 19. Cosmos. 
ane es peaked, straight, with 2 —4 barbed persistent 
18. Bidens. 
Po abe not peaked, complanate, winged and straight, or 
wing sles Ss and curv ed or twisted, with 2 OF r 1 deciduous 
or naked ; 
tyle surrounded at the base by an ane disk 17. Campylotheca. 
the 
Receptacle pias leaves ae ernate or spir 
Ong palea to each flor ret; disk-ac shenes “broadly wing 15. Verbesina. 
leaves linear, silver Ty 20. Argyroxiphium. 
Givietacts naked; leayes altern 
sud -flowers Dilabiate, not pin florets of disk and ray a 
OW ; eadin shrub 4, Remya. - 
Rayos ligule pink or pale purple 
Pappus ; disk yellow W, Tay sv a seapigerous herb 5. Lagenophora. 
Ray-flowers in = row; disk ele 6. Aster. 
Ray-flowers i ral rows; disk pur 8. Tetramolopium. 
eads Somogemons, ihe re heaae all ligulate Aire § lo 
leaves alternate 
Invol. bracts esuen equal, in a single row, with a few small 
outer ones 28. Crepis. 
29. Sonchus. 
Inyol. bracts unequal, imbricate in several Yows 
Trine I. VERNONIEAE. 
Cade discoid, the florets all tubular, hermaphrodite and fertile. Anthers 
Sagittate but not caudate. Style-branches subulate. Leaves alternate. 
1. VERNONIA, Schreb. : 
Florets all tubular and equal, 5-cleft. Inyolucre imbricate, not longer 
Achenes 
than the florets, the inner bracts the longest. Receptacle nak 
appus of numerous i capilay 
an 
bristles. — Herbs, shrubs or climbers, with alternate leaves. euckeads 
terminal or in the upper axils, in cymes or panicles or sometimes solitary. 
A large genus, diffused over the tropics of all continents, excepting Australia. 
inerea, Less. — DC. Prodr. V, 24. — An erect annual, 1 to 
i a minute pubescence on 
ceolate, decurrent on the petiole, often irregularly toothed or sinuate, the 
upper few and narrow. He mall, on eres pedicels, forming a 
ads 
terminal leafless cymose cnererres Inyol. bracts acute. Corollas bluish. 
