168 . THE FLORA. 



a C. rhomboid'ia. Ehombic G. Stems upriglit, bearing tubers at base. Pods 

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



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

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



5 billidifo'lia. Daisy-leaved 0. Leaves smooth, roundish. Pods erect. Heigh 



1-3^ N. IL 



6 .0. spatula'ta Spath-leaved C. Leaves hairy, spatulate. Pods spreading. Q\ 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. vulga'ris. Winter Cress. Common in old fields, also brook-sides. Whole plant 

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

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

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

 scurely 4-cornered, slender, %' 1.)- ". curved upward^s. May. June. % 



IL ERYSIMUM. False Wall-flower. 



Calyx closed. Silique linear, 4-sided. Stigma capitate. Seeds m 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 (i' broad). 



Pods 2-3' long. River blufl's. A fine plant. W. 



12. SmATIS. 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. Blach M. Upper leaves lance-linear, entire. Pod 4-cornered, smooth. 



2 S. 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. 



Order XVI. YIOLA'CE^. Violets. 



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

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

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



