PLANTS FROM NORTH DAKOTA 59 
. . e 
Oligoneuron bombycinum sp. nov. 
Caules numerosi, de rhizomate crasso, perenni adscendentes, 
rigidi, simplices, densa, molli, alba pubescentia vestiti, valde 
foliosi, parte inferiore laminis petiolorum magis minusve involuti. 
Folia oblonga, crassa et rigida, marginibus integris, leviter vel 
nequaquam scabris, pubescentia mollissima, alba ambobus later- 
ibus amicta, superiora quidem parva, sessilia, amplectantia, 
inferiora autem vehementer maiora et petiolis longis, alatis ornata. 
Folia basilaria longiores tamen petiolos habent, non alatos. In- 
volucra 6-8 mm. alta, cymum compactum, terminalem sicut 
capitulum compositum formantia. Bracteae involucri oblongae, 
puberulentae, pallide viridi-flavescentes. Flores radiati saturate 
flavi. 
Stems numerous, 2.5-3.0 dm. high, ascending from a thick, 
perennial root-stock, stiff, simple, with a thick, soft, white pubes- 
cence, very leafy, the lower part more or less enveloped in the 
sheaths of the leaves. Leaves oblong, thick and rigid, with entire, 
slightly or not at all scabrous margins, and with a soft, velvety, 
white pubescence on both sides, the upper small, sessile, clasping, 
the lower considerably larger, with long, winged petioles. The 
basal leaves have still longer petioles, not winged. Involucres 
6-8 mm. high, in a terminal, compact eyme having the appear- 
ance of a compound head. Involucral bracts oblong, puberulent, 
pale greenish-yellow. Rays deep yellow. 
The soft, velvety pubescence of the stems and leaves is the 
principal character segregating this species from O. rigidum which 
is rough throughout. If O. rigidum grows exclusively in dry soil, 
O. bombycinum seems to prefer a moderate degree of moisture 
in the soil. The description is based on a specimen collected by 
the writer on September 9, 1910 at Butte, Benson County, where— 
if luck is not adverse—an occasional find recompenses the assid- 
uous, indefatigable seeker. 
Euthamia camporum var. tricostata var. nov. 
Folia conspicue trinervata; insuper duo nervi minus prom- 
inentes exteriores saepe accedunt. Inflorescentia est valde 
glutinosa. 
Leaves prominently tri-nerved; in addition, another faint 
external pair of nerves can often be seen. Inflorescence very 
glutinous. . 
