348 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



12. CONEINGIA Link. 



1. Conringia orientalis (L.) Dum. Haee's-ear mustard. Occasional at low alti- 



itudes, chiefly n waste ground. Native of Eur.; occasionally naturalized as a weed 



in N. Amer. — Glabrous annual, 30 to 60 cm. high; leaves mostly oval, 4 to 10 cm. long, 



entire, clasping, very pale; petals white, 8 mm. long; pod 4-angled, 8 to 10 cm. long, 



about 2 mm. thick. 



13. CHEIRINIA Link. Wild wallflower. 



Annuals or biennials, with leafy stems; pubescence of small, appressed, gray, 2 or 

 3-branched hairs; petals yellow; pods linear, somewhat 4-angled. 

 Petals 4 to 5 mm. long; pods 2 to 3 cm. long; plants green . . 1. C. cheiranthoides. 

 Petals 8 to 10 mm. long; pods mostly 3.5 to 5 cm. long; plants grayish. 



2. C. inconspicua. 



1. Cheirinia cheiianthoides (L.) Link. Occasional on the east slope at low alti- 

 tudes, in meadows or on open hillsides. Alaska to Utah, N. C, and Newf. 

 (Erysimum cheiranthoides h.) — Plants branched, 30 to 60 cm. high; leaves linear or 

 lanceolate, 2 to 6 cm. long, entire or shallowly toothed; petals bright yellow. 



2. Cheirinia inconspicua (S. Wats.) Rydb. Frequent on the east slope at low 



altitudes, in meadows or on open hillsides. B. C. to Colo, and Minn. — Stems 30 to 60 



cm. high, often branched; leaves mostly linear, entire or shallowly toothed; petals 



pale yellow. 



14. CAMPE Dulac. 



1. Campeortlioceras (Ledeb.) Heller. Wintercress. Occasional at low and middle 

 altitudes, in moist woods or thickets. B . C. to Colo, and Mont. ; also in Eur. , and natu- 

 ralized in eastern N. Amer. (C. americana Cockerell; Barbarea americana Rydb.) — 

 Plants biennial, 30 to 50 cm. high, stout, glabrous; leaves pinnately lobed, with 

 broad rounded lobes; petals yellow, 2 to 4 mm. long; pods 2 to 3 cm. long, 2 mm. thick, 



somewhat 4-angled . 



15. BRASSICA L. Mustard. 



Annuals with leafy stems; leaves, at least the lower ones, lobed; petals yellow; 

 pods long, cylindric, beaked. 

 Stems hairy, at least below; beak of the pod usually 10 to 15 mm. long, containing a 



seed in the lower part 1. B. arvensis. 



Stems usually glabrous; beak 4 to 7 mm. long, seedless 2. B. juncea. 



1. Brassica arvensis (L.) Kuntze. Charlock. Occasional at Beltou and east 

 entrance, in waste ground. Native of Eur.; naturalized in N. Amer. (Sinapis 

 arvensis L.). — Stems stout, branched, 30 to 70 cm. high; upper leaves ovate or lanceo- 

 late, toothed; petals about 8 mm. long; pods 3 to 4 cm. long. 



2. Brassica juncea (L.) Coss. Indian mustard. Occasional on the east slope at 

 low altitudes, in waste ground. Native of Asia; naturalized in N. Amer. — Plants 0.3 

 to 1 meter high, branched, often glaucous; leaves mostly lobed; petals 8 to 10 mm. 

 long; pods 3 to 5 cm. long. 



16. CARDAMINE L. Bittercress. 



Perennials, glabrous or nearly so; leaves pinnate; petals white; pods long, narrow, 

 flattened. 

 Petals usually 5 to 6 mm. long; leaflets usually 3 to 7, some of them rounded. 



1. C. breweri. 

 Petals 2 to 3 mm. long; leaflets 5 to 15, most of them oblong or oblanceolate. 



2. C. pennsylvanica. 



1. Cardamine breweri S. Wats. Frequent at low and middle altitudes, in wet 

 woods or thickets, or marshes, or along streams. B, C. to Calif. Wvo.. and Mont. — 



