Mustard Family 171 



sparsely pubescent with stiff "hairs or nearly glabrous above; lower 

 leaves deeply lyrate-pinnatifid; segments crenate or dentate; 

 flowers 12-18 mm. broad, yellowish or commonly whitish with 

 purple veins; pods 2-4 cm. long, constricted between the seeds 

 when mature; seeds 2-several ; beak conical, 1-2 cm. long. 



Frequent in poorly cultivated fields and waste places, especially in sandy 

 soils. April-June or often throughout the year. 



10. BARBAREA R. Br. 



Erect glabrous biennial or perennial branching herbs 

 with angled stems, pinnatificl leaves and racemose yellow 

 flowers. Silique elongated, linear, 4-angled ; valves keeled 

 or ribbed ; style short ; stigma 2-lobed or capitate. Seeds 

 in 1 row in each cell, flat, oblong, marginless. Cotyle- 

 dons accumbent. 



1. B. Barbarea (L.) MacM. Tufted stems erect, 3-6 dm. 

 high; lower leaves petioled, 5-12 cm. long, lyrately-pinnatifid, 

 segments oval or obovate, repand-toothed or sometimes entire ; 

 upper leaves sessile, rarely clasping; flowers yellow, 6-8 mm. 

 broad; pods spreading or ascending, about 2 cm. long, obscurely 

 4-angled; pedicels about 4 mm. long. (B. vulgaris R. Br.) 



Moist places in the mountains, confined mostly to the pine belt. June- 

 August. 



11. RORIPA Scop. 



Branching herbs with simple or pinnate-lobed, dissected 

 or rarely entire leaves and yellow or white flowers. Sepals 

 spreading. Stamens often less than 6. Pods short or 

 elongated, terete or nearly so, sessile on the receptacle ; 

 valves faintly 1-nerved or nerveless. Styles short or 

 slender. Seeds turgid, minute, in 2 rows in each cell. 

 Cotyledons accumbent. 



* Flowers white. 



1. B. Nasturtium (L.) Rusby. (WATERCRESS.) Aquatic, gla- 

 brous; stems branching, floating or creeping, rooting from the 

 nodes; leaves odd-pinnate; leaflets 3-11, roundish or oblong, 



