NEOPIIYTON. 
35 
essee, annual estival, only 3 to 4 inches high — 
leaves not ciliate, but the calix instead. 
278. Isanthus pubescens Raf. quite pubes- 
cent, stem branched, leaves sessile trinerve lan- 
ceolate acute, peduncles biflore curved sub- 
equal to leaves longer than calix — Mts. Wasi- 
oto or Cumberland of East Kentucky, annual, 
pedal. This is nearer to I ceruleus of Mx. 
my Is. ciliatus which has however leaves ovate 
lanceolate ciliate, short peduncles and is nearly 
viscid. 
279. Isanthus multiflorus Raf. smooth, 
very branched, leaves sessile linear lanceolate 
uninerve, peduncles multiflore, pedicels shorter 
than calix — with the last in the Wasioto hills, 
semipedal, annual. Thus this monotype Amer- 
ican Genus is now increased by me to 4 spe- 
cies ; they are all estival and commonly grow 
in Limestone soils, I have perhaps another 
doubtful from Texas, with obovate leaves. 
280. Parthenium hispidum Raf. stem fiex- 
uose sulcate hispid, hairs white, lower leaves 
obovate base acute, the lowest on a long hispid 
petiol, upper leaves sessile oblong and ovate, 
base truncate, all acute with large unequal 
teeth ciliolate, slightly hispid on both sides, 
flowers corymbose glomerate sessile tomentose 
pale fulvous — another sp. of this American 
Genus, from the Glades of Arkanzas and Texas 
humble, hardly over a foot high, with stiff white 
hairs, only one radical petiolate leaf, few leaves 
all different in size and shape, flowers fulvous 
white, perianthe with ovate obtuse sepals. 
281. Triosteum connatum Raf. perfoliatum 
and majus of some hot — stem sulcate pubes- 
cent, leaves connate ovate rhomboidal acumi- 
nate undulate, rough above, tomentose beneath 
