)9. srysimum (Tourn. ) Le ‘all Flower. 
Anmial or biennisl herbs. Pubescence of appressed hairs attached at 
the middle. Leaves alternate and basal. Flowers often conspicuous, yellow. 
Sepals erect, the lateral ones more or less gibbous at the base. Petals 
obovate, slenderly clawed. Filaments unappendaged. Capsules linear,con- 
pressed, or more or less 4-angled, the valves with a conspicuous midvein. 
Seeds numerous, sometimes margined, in 1 row in each compartment. ~ 
© Flowers pale yellow, 4-5 mm. long; pods 2-3 cm. long |. E- cheiranthoides 
o Flowers bright vellow, 15-20 mm. long; pods 4-10 cm. 
4 long i 
2 Inflorescence unbranched 2. Es asperum | 
2 Inflorescence branched 8. Ee oblanceolatum 
1. & cheiranthoides L. \Wormseed mustard. Annual, 30-50 cm. tall or . 
more, imdapauperate-specimens Mach boas ecoiped branched in the upper 
axilss leaves chiefly 
cauline, the lowornpet dropping early, narrowly oblanceolate, chen, cme long, 
acute, narrowed at the base to an indefinite petiole, the shortly 
petiolate, all appearing glabrate, but with some appressed hairs; flowers | 
pale yellow, 5 mm. long, pods about 2 cme long, 1.3 mm. wide, narrowed at the 
apex and base, obscurely 4-angled, pubescent with appressed hairs, ascending 
or erect on spreading pedicels 8 mm. long; seeds 4 
narrowly elliptical, 1 mn. rouge? (Cheirinis cheiranthoides Link.). 
Lake Coeur d'Alene, Hy, Leiberg 1509; Lamb Cr., 3000 ft., Epling and 
Houck 10230; Granite Stea., Bpling. 
‘"festern Wallflower ) 
Ze He e.sperum (Nutt. ) Dee, Anmal, 40-80 cm. tall, erect and unbranched? 
i basal leaves ina 
tuft, soon withering and dropping, 7-8 cm. long, very narrowly oblanceolate, 
attenuate to an indefinite petiole, erect; cauline leaves similar, but broader, 
all sinuately toothed, appressed-pubescent; flowers bright yellow, 15-20 mn. 
long, sepals often yellow, thin, blades of the petals rotund, 4-6 mm. broad; 
pods ascending, terete but 4-angled, 4-10 cm. long, 1.5-2 mm. broad, appressed 
pubescent, tipped by the rather stout, 2-lobed style, on stout pedicels about 
l cme long; seeds ttme—stmate-rewp narrowly olliptical, 2 mm. jong, apiculate 
or narrowly mergined at the apex. ——»(Cheiranthus asper Nutt; Cheirinia 
> aspera Rydb.). 
Sunny rocky slopes in thin soil, 2000-6500 feet; frequent throughout our 
regione 
ae 
eer 
