166 THE FLORA. 



a O. rhomboid'ia. Rhombic C. Steins upright, bearing tubers at base. Poda 



linear-lanceolate. Leaves roundish and rhomboidal. w. or p. c. 

 4 C. rotundifo'lia. Bound-leaved G. Stems decumbent, branched. Pods linear- 

 subulate. Leaves roundish, lower 3-lobed. w. By streams. 

 5 C biUidifo'lia. Daisy-leaved G. Leaves smooth, roundish. Pods erect. Height 



1-3^ N. H. 

 C O. spatula'ta. Spath-leaved G. Leaves hairy, spatulate. Pods spreading. 6''. S. 



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 a single row. Leaves lyrate-pinnatifid. Flowers yellow. 



B. vulga^ris. Winter Gress. Common in old fields, also brook-sides. Whole plant 

 glabrous. Stem l-2f, higli, branching above. Leaves lyrate with the terminal 

 lobe roundish, upper leaves obovate, pinnatifid at base, crenate, or repand- 

 dentate — all dark green, sliining. Flowers showy, in racemes. Pods ob- 

 scurely 4-cornered, slender, ij' long, curved upwards. May, June, ti 



11. ERYSIMUM. False Wall-flower. 



Calyx closed. Silique linear, 4-sided. Stigma capitate. Seeds in a 

 single row in each cell. Mostly ©. Flowers yellow. 



1 E. cheiranthoi'des. Stem ascending. Fls. small. Pods spreading, l''in length. M. 



2 E. Arkansa'num. Yellow Phlox. Stem strictly erect. Flowers large {^' broad). 



Pods 2-3' long. Kiver bluffs. A fine plant. W. 



12. SIN'ATIS. Mustard. 



Sepals spreading. Petals ovate, with straight claws. Silique nearly- 

 terete, valves 3-veined. Style short. Seeds in a single row, globular. — 



or © with yellow flowers. (Figs. 393, 394.) 



1 S. nigra. Black M. Upper leaves lance-linear, entire. Pod 4-cornered, smooth. 



2 S. arven'sis. Field M. Leaves all repand-toothcd. Pods torose, smooth. 



3 S. alba. White M. Leaves all lyrate-pinnatifid. Pods bristly, shorter than beak. 



Order XYI. YIOLA'CE.E. Violets. 



Eerhs with simple (often cleft), alternate leaves with stipules ; 

 flowers irregular, spurred, with the sepals, petals, and stamens in S's ; 

 corolla spurred at base; anthers united: 2 of the filaments appendaged; 



