crucifer^e. (mustard FAMILT.j 35 



and broadish pods spreading or ascending. — Fort Gratiot, &c., Michigan. -~ 

 Root-leaves hairy. Pod 1' long. Flowers pale purple. 



§. BARB A RE A, K.Br. Winter Cress. 



Pod linear, terete or somewhat 4-sided ; the valves being keeled by a mid- 

 nerve. Seeds in a single row in each cell, marginless. Cotyledons accumbent. 



— Mostly biennials : flowers yellow. (Anciently called The Herb of St. Bar- 

 bara. ) 



1. B. vulgaris, R. Br. (Common Winter Cress. Yellow Rock- 

 et.) Smooth ; lower leaves lyrate, the terminal division round ; upper leaves 

 obovate, cut-toothed, or pinnatifid at the base; pods couvex-4-angled, much 

 thicker than the pedicel, erect, pointed with a manifest style ; — or, in the var. 

 stricta, rather flatter, tipped with a thicker and very short style (B. pracox. 

 Hook. Fl. Bor.-Am., &c.) ; — or, in var. arcuata, ascending on spreading ped- 

 icels when young. — Low grounds and road-sides. May. — Probably naturalized 

 from Europe. But the varieties here indicated are indigenous from Lake Supe- 

 rior northward and westward. (Eu.) 



B. precox, R. Br. (B. patula, Fries), — occasionally cultivated for salad 

 in the Middle States, under the name of Scurvy-Grass, — is becoming spon- 

 taneous farther south. It is readily known by its longer and less erect pods, 

 scarcely thicker than their pedicels, and by the linear-oblong lobes of most of 

 the stem-leaves. 



9. ERYSIMUM, L. Treacle Mustard. 



Pod linear, 4-sided ; the valves keeled with a strong midrib. Seeds in a single 

 row in each cell, oblong, marginless. Cotyledons (often obliquely) incumbent. 

 Calyx erect. — Chiefly biennials, with yellow flowers ; the leaves not clasping. 

 (Name from epva>, to draw blisters.) 



1. E. clieiramtlioides, L. (Worm-seed Mustard.) Minutely 

 roughish, branching, slender ; leaves lanceolate, scarcely toothed ; flowers small ; 

 pods small and short (7" -12" long), very obtusely angled, ascending on slender 

 divergent pedicels. — Banks of streams, New York, Perm., Illinois, and north- 

 ward : apparently truly indigenous. July. (Eu.) 



2. E. Al'kaiisaiiiani, Nutt. (Western Wall-flower.) Minutely 

 roughish-hoary ; stem simple ; leaves lanceolate, somewhat toothed ; pods nearly 

 erect on vei-y short pedicels, elongated (3' - 4' long), exactly 4-sided ; stigma 2-lobed. 



— Ohio (on limestone cliffs) to Elinois, and southwestward. June, July. — 

 Plant stout, l°-2° high; the crowded bright orange-yellow flowers as large as 

 those of the Wall-flower. 



lO. SISYMBRIUM, L. Hedge Mustard. 



Pod terete, flattish, or 4-6-sided; the valves 1-3-nerved. Seeds oblong, 

 marginless. Cotyledons incumbent. Calyx open. — Flowers small, white or 

 yellow. (An ancient Greek name for some plant of this family ) 



