156 BRASSICACEAE. 



entire; racemes elongated in fruit; flowers white, 4-5 mm. broad; 

 petals twice the length of the sepals; pods 1-3 cm. long, 2 mm. 

 wide, spreading and slightly curved upward, on pedicels of about 

 their own length. ( Nasturtium officinale R. Br.) 

 Common in streams. May-October. 



12. RADICULA Hill. 



Branching herbs with simple or pinnate-Iobed, dis- 

 sected or rarely entire leaves and small yellow flowers. 

 Sepals spreading. Stamens often less than 6. Pods 

 short, 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. 



1. R. curvisiliqua (Hook.) Greene. Annual or biennial, sparingly 

 pubescent or glabrous, with erect or ascending, usually much branch- 

 ed stems, 15-45 cm. high; leaves mostly oblanceolate in outline, 

 pinnatifid, pinnately lobed or toothed, the lower 25-75 mm. long; 

 racemes short; flowers pale yellow, 4 mm. broad; petals slightly 

 exceeding the sepals; style short; pods linear, 8-15 mm. long, about 

 1.5 mm. wide, strongly curved upward; pedicels spreading or ascend- 

 ing. 



Frequent in low ground, about ponds and on river bottoms. 

 Variable in foliage characters. 



13. CARDAMINE L. 



Erect or ascending herbs mostly growing in marshes 

 or along watercourses, with running rootstocks or fibrous 

 roots, entire, lobed or divided leaves and racemose or 

 corymbose, white or purple flowers. Stamens usually 

 6. Siliques elongated, flat, generally erect; valves 

 nerveless, elastically dehiscent at maturity, sessile on 

 the receptacle. Seeds in 1 row in each cell, compressed, 

 marginless. Cotyledons accumbent, equal or unequal. 



1. C. gambellii Wats. Rather stout, 6-9 dm. high, branched, 

 decumbent at base and rooting at the lower joints, glabrous or 

 sparingly soft villous; leaves mostly basal, persisting in a rosulate 

 cluster, pinnately divided; leaflets 4-6 pairs, ovate to oblong-linear, 

 usually cuneate at base and acute, mostly few-toothed, 6-24 mm. 

 long; raceme nearly sessile, becoming elongated; flowers white, 

 6-8 mm. broad; pedicels slender, divaricate; pods about the same 

 length, narrow, erect or ascending, often curved; style slender, 2 mm. 

 long. 



Frequent in marshes and wet places in the valleys. 



