3. P, heterophylla Pursh, Biennial or perennial keett with numerous basal 
lca dt or entire, their blades 4-12 ecm, long, the principal lobes 
mostly elliptical, the lateral lobes spresding, much smaller, the stems 
and both surfaces of the leaves hispid with harsh hairs and usually more 
or less hirsute with shorter hairs, green not canescent; inflorescence 
20-150 cm, tall, elongate, usually single, very straight, the ascending 
branches typically appressed; sepals 3-5 mm, long hirtellous and hispid, 
linear, linear-oblong or linear-lanceolate, increasing to 7-8 mm, in fruit; 
corolla 4-6 mn, long, white, becoming yellowish especially below the sinuses, 
the appendages oblong, half as long as the corolla; stamens thinly woolly, 
about twice as long as the corolla, exserted; capsule ovoid, 4 mn. long, 
acuminate, hisnvid; seeds brown, pitted, rather acute at one end, 
Prevalent in the southern part of our region especially in the drainage 
of the Clearwater Re$ apparently a complex of several forms of which the 
2 
robust hispid plant of the Clearwater canyon appears to represent t&®e Lewis 
Urtcth. urea Aieess in A. tay 
a the elegant smaller plant of more northern drainages (P. 
hastata Dougl.) and a greener more lax form vith ascending stems and entire 
leaves (P, leptosepala Rydb,) seem scarcely different and both tend to merge 
with the following species, 
Hf. Pe leucophylla Torrey. Biennial or perennial hebit with numerous basal 
leaves and several slender stems curving upwards, 30-50 cm, tall, less 
frequently 70 cme, the leaves prevailingly entire, narrowly elliptical, 
3-8 cm, long, eo-c cm, wide, tapering to petioles about as long as the 
blades, both surfaces hispid with more or less appressed hairs and typically 
Vv 
canescent with sorter dense pubescence; branches of the inflorescence 
A 
ascending loosely and forming a convex cluster; sepals 3-5 mm, long, 
hirtellous and hispid, linear, linear-oblong or linear-lanceolate, increasing 
to 7-8 mm, in fruit; corolla 4-6 mm, (usally about 5 mm.) long, white, 
