POLYPETALOUS EXOGEiq-QUS PLANTS- 159 



branching ; leaves oblong-obovate, pinnatifid toward the 

 base, toothed above, obtuse ; silique linear-oblong, pointed 

 with the very short and thick style 4—5 times as long as 

 the pedicel. Flowers small and yellow. 



CARD AMINE, L. Bitter Cress. 



Silique linear, flattened; the valves nerveless, usually 

 opening elastically from the base. Seeds several, wingless, 

 disposed in a single row in each cell, suspended by fili- 

 form stalks. Cotyledons accumbent. — Herbs. Leaves 

 often undivided. Flowers purple or white. 



* Perennials. 



C. ROTUNDiFOLiA, DC. Smootli. Leaves oval, or or- 

 bicular or cordate petiolate ; root fibrous ; stem erect, sim- 

 ple, bearing from the root or upper axils long and leafy 

 runners. Tlie lowest leaves are very long petioled, and 

 sometimes sparingly pinnatifid. Silique subulate, spread- 

 ing; seeds oval. Cool springs. May and June. Stem 

 6-12' high. Runners 2°-3° long. Floivers white. 



** Annuals. 



C. LuDOYiciANA, Hook. Low; ste?ns branching and 

 hairy at the base ; leaves lanceolate pinnatifid, with nu- 

 merous, oblong sparingly-toothed lobes, those of the root 

 tufted; silique broadly linear, erect, spreading, pointed 

 with the sessile stigma ; seeds orbicular, margined. Stems 

 4-6' high. Floivers small and white. 



C. HiRSUTA. Stem hairy or smooth, erect, l°-2° high, 

 branching. Leaves pinnatifid, with numerous oval or ob- 

 long sparingly-toothed lobes, those of the upper leaves 

 linear and entire; silique narrow, linear, erect, pointed 

 with the nearly sessile stigma ; seeds oval, minute, and 

 marginless. Wet soil. March, April. Floivers small and 

 white. 



