17'J Cruciferae 



nearly entire; racemes elongated in fruit; flowers white, 4-5 

 mm. broad; petals twice the length of the sepals; pods 1-3 cm. 

 long, 2 nun. wide, spreading and slightly curved upward, on 

 pedicels of about their own length. (Nasturtium officinale R. Br.) 

 Common in streams. May-October. 



** Flowers yellow. 



2. R. curvisiliqua (Hook.) Bessey. Annual or biennial, spar- 

 ingly pubescent or glabrous, with erect or ascending, usually 

 much branched stems, 15-45 cm. high; leaves mostly oblanceolate 

 in outline, pinnatifid, pinnately lobed or toothed, the lower 25-75 

 nun. long; racemes short; Mowers 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 ascending. 



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

 foliage characters. 



12. CARD AMINE 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 

 (>. 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 rosu- 

 late cluster, pinnately divided; leaflets -t-fi pairs, ovate to 

 oblong-linear, usually cuneate at base and acute, mostly few- 

 toothed, 6-24 mm. long; raceme nearly sessile, becoming elon- 

 gated; 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. 



