166 THE FLORA. 
% O. rhomboid’ia. Rhombic C. Stems upright, bearing tubers at base. Pods 
linear-lanceolate. Leaves roundish and rhomboidal. w. orp. ¢ 
4 C,rotundifo’lia. Round-leaved C. Stems decumbent, branched. Pods linear- 
subulate. Leaves roundish, lower 8-lobed. w. By streams. 
5 © Dillidifo’lia. Daisy-leaved C. Leaves smooth, roundish. Pods erect. Height 
1-3’, N. H. 
6 C. spatula’ta. Spath-leaved C. Leaves hairy, spatulate. Pods spreading. 6’. 8, 
10. BARBA’REA. Winter Cress. 
Sepals erect, nearly equal at base. Silique columnar, 2—4-cornered. 
Valves concave or keel-shaped by means of a strong central vein. Seeds 
in asingle row. Leaves lyrate-pinnatifid. Flowers yellow. 
B. vulga’ris. Winter Cress. Common in old fields, also brook-sides. Whole plant 
glabrous. Stem 1-2f. high, branching above. Leaves lyrate with the terminal 
lobe roundish, upper leaves obovate, pinnatifid at base, crenate, or repand- 
dentate—all dark green, shining. Flowers showy, in racemes. Pods ob- 
scurely 4-cornered, slender, 3’ long, curved upwards. May, June. 
11. ERYSIMUM. False Wall-flower. 
Calyx closed. Silique linear, 4-sided. Stigma capitate. Seeds in a 
single row in each cell. Mostly @. Flowers yellow. ei 
1 E. cheiranthoi’des. Stem ascending. Fis. small. Pods spreading, 1’ in length. M. 
2 E, Arkansa’num, Yellow Phlox. Stem strictly erect. Flowers large (} broad). 
Pods 2-3’ long. River bluffs, A fine plant. Ww. 
12. SINA’PIS. Mustard. 
Sepals spreading. Petals ovate, with straight claws. Silique nearly 
terete, valves 8-veined. Style short. Seeds in a single row, globular.— 
@ or ® with yellow flowers. (Figs. 393, 394.) 
1S. nigra, Black M. Upper leaves lance-linear, entire. Pod 4-cornered, smooth. 
2S. arven’sis. Field M. Leaves all repand-toothed. Pods torose, smooth. 
8 S. alba. White M. Leaves all lyrate-pinnatifid. Pods bristly, shorter than beak, 
Orpvrr XVI. VIOLA'CE. Violets. 
Herbs with simple (often cleft), alternate leaves with stipules ; 
Jlowers irregular, spurred, with the sepals, petals, and stamens in 5's; 
corolla spurred at base; anthers united: 2 of the filaments appendaged; 
