NELSON: NEW PLANTS FROM WYOMING 243 
12mm. long: the stigmas surpassing the petals when the latter 
are closed : fruits small, 12-15 mm., strictly basal, not tubercled 
and but slightly angled. 
If one accepts the current descriptions of P. caespitosa (Nutt.) 
Raimann as really applying to the Oenothera caespitosa of Nuttall, 
there can then be no doubt about the validity of the species now 
described. In Nuttall’s Genera he uses the word “smooth” of 
the leaves and “ cespitose”” of the crowns which is just the case in 
the now proposed P. glabra. But he also speaks of the large size 
of the flowers and the tuberculate capsule which are characters of 
the pubescent plant we have so long recognized as Nuttall’s. 
Whatever, then, Nuttall’s plant may prove to be, the present one 
Seems distinct and is readily known by its wholly glabrous condi- 
tion, narrow leaves which surpass the much smaller flower, and 
the capsule which is not tubercled but which has four rounded 
veins. 
The type specimens were collected on the Platte River bottoms, 
near Badger, Wyoming (Laramie County), June 1, 1901, xo. 8340. 
“ Lavauxia flava sp. nov. 
Stemless, perennial (probably short-lived) from somewhat 
fleshy roots, nearly glabrous, only a little pubescence on the 
Margins of the leaves: leaves crowded on the crown, oblong- 
lanceolate in outline, gradually narrowed to the margined base, 
deeply and irregularly runcinate-pinnatifid, 15-25 cm. long (in- 
cluding petiole): flowers much shorter than the leaves ; calyx- 
tu © 4~7 cm. long, its lobes about 2 cm. long: petals yellow, in- 
variably turning pink with age and in drying, obovate, attached by 
a broad base, entire and broadly rounded at summit: stamens 
Shorter than the petals, the filaments rather broad, the anthers 
attached about one third of their length from the base: capsule 
oblong, narrowly wing-angled, 2-3 cm. long, one third as broad : 
Seeds numerous, cuneate-obovate, slightly concave with a carinate 
tidge on the ventral side, and with a narrow crest-like margin 
round the obtuse summit. 
At least some of the plants from the Rocky Mountains which 
have passed as Lavauxia triloba (Nutt.) Spach are distinct from 
that Species, whether we consider the Nuttallian plant from the 
Red river country (Arkansas) or that one in literature which is said 
to have white flowers. Nuttall’s plant was described as having 
