1G8 THE FLORA. 



8 O. rhomboid'ia. Rhombic G. Steins upright, bearing tubers at base. Pods 



linear-lanceolate. Leaves roundis-h and rhoniboidal. w. or p. c. 

 4 C rotundifo'lia. Round-leaded C. Stems decumbent, branched. i'odsl.near 



subulate. Leave? roundish, lower 3-lobed. ID. By streams. 

 5 O niUidifo'lia. Daisy-leaved 0. Leaves smooth, roundish. Pods erect. Iluigh 



1 V. N. II. 

 1 spatu.a'ta. Spath-leaved C Leaves hairy, spatulate. Pods spreading. 6'. S 



10. BAEBA'REA. "Winter Cress. 



Sepals er*ct, 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 

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

 lobe roundish, upper leaves obovate, pinnatilid at base, crenatc, or repand- 

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

 scurely 4-cornered, slender, 3' Li-.-?, curved upwards. May, June, n 



11. ERYS'IMUM. False Wall-flower. 



Calyx closed. Silique linear, 4-sided. Stigma capitate. Seeds m n 

 single row in each cell. Mostly . Flowers yellow. 



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



2 E. Arkansa'num. Yellow J'Mox. Stem strictly erect. Flowers large (J' broadl. 



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



12. SUSTATIS. 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. Slack M. Upper leaves lance-linear, entire. Pod 4-cornered, smooth. 



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



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



ORDER XVI. VIOLA'CEJS. Violets. 



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

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

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



