106 THE FLORA. 



8 O. rhomboid'ia. BTiombic G. Stems upright, bearing tubers at base, "^oda 

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



i a. rotundifo'lia. Bound-leaved G. Stems decumbent, branched. Pods Imear- 

 snbulate. Leaves roundish, lower 8-lobed. w. By streams. 



5 O. billidifo'lia. Daisy-hmed G. Leaves smooth, roundish. Pods erect. Height 



1-8'. N. H. 



6 O. spatula'ta. Spafh-lemed G. Leaves hairyj spatulate. Pods spreading. 6'. S. 



10. BARBA'EEA. 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. vnlga'ris. WmUr Cress. Common in old fields, also brook-sides. "Whole plant 

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

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

 dehtate — all dark green, shining. Flowers showy, in racemes. Pods ob- 

 scurely 4-oornered, slender, %' long, curved upwardo. May, June, ii 



11. EEYS'IMUM. False ■Wall-flower. 



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

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



1 E. cheiraiithoi''des. Stem ascending. Fls. small. Pods spreadingjl' in length. M. 



2 E. Arkansa'num. Yellow Phlox. Stem strictly erect. Flowers large (}' broad). 



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



12. SINA'PIS. Mustard. 



Sepals spreading. Petals ovate, witb straight claws. Silique nearly 

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

 ® or ® with yellow flowers. (Figs. 393, 894.) 



1 S. nigra. Bladk M. Uppe'r leaves lance-linear, entire. Pod 4-cornered, smooth. 



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



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



Order XVI. VIOLA'CE^. Violets. 



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

 flowers irregular, spurred, with the Sepals, petals, and stamens in 5's ; 

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



