RYDBERG: Rocky MOUNTAIN FLORA 433 
This species has been confused with 7. sagittatum (Nutt.) Endl., 
but differs in the smaller and narrower petals, nearly erect pedicels 
and narrow pod. 
SOUTHERN Urtanu: 1877, &. Palmer 25 (type in herb. Columbia 
Univ.). — 
Thelypodium leptosepalum sp. nov. 
Annual or biennial, glabrous throughout ; stem 4-6 dm. high, 
branched ; leaves thin, glabrous, 6-10 cm. long, lyrate-pinnatifid 
with lanceolate divergent lobes; flowering pedicels about 3 mm. 
long ; sepals lance-subulate, 6 mm. long, 1-1.5 mm. wide at the 
base, white ; petals narrowly linear-oblanceolate, almost strap- 
shaped, with scarcely any distinction between blade and claw, 8 
mm. long, 0.5 mm. wide or less; filaments filiform, about 1 cm. 
long when well developed; anthers linear, sagittate at the base, 
soon curled. 
This is closely related to 7: /aciniatum (Hook.) Endl., but 
differs in the narrow tapering instead of oblong sepals. It grows 
at an altitude of 450-600 m. on rocky banks. 
IpaHo: Lewiston, Nez Perces County, 1896, A. A. & £. Ger- 
trude Heller 3022 (type in herb. Columbia Univ.) ; Valley of Peter 
Creek, Nez Perces County, 1892, Sandberg, MacDougal & Heller 
122, 
PLEUROPHRAGMA gen. nov. 
Tall glabrous perennials or biennials with paniculate inflores- 
cence and thick entire leaves. Basal leaves oblanceolate or spatu- 
late ; stem-leaves linear-lanceolate, sessile but not clasping. Se- 
pals ascending, thin, more or less petaloid. Petals white or 
purplish with slender claws. Filaments distinct, subulate, white, 
somewhat dilated below and with conspicuous glands at their 
es; anthers linear, sagittate at the base, curved. Receptacle 
dilated. Pod slender, terete, torulose, tapering at both ends into a 
short stipe below and a short slender style above ; stigma minute, 
entire ; septum with a strong midrib. 
Pleurophragma integrifolium (Nutt.) 
£ Soueamae integrifolium Nutt.; T. & G. Fl. N. Am. 1: 96. 
1838. 
Thelypodium integrifolium Endl.; Walp. Rep. 1: 172. 1842. 
Pleurophragma gracilipes (Robinson) 
Thelypodium integrifolium gracilipes Robinson, Syn. Fi 176. 
1895. 
