CRUCIFERiES. 25 



23. LEPIDIUM, Linnaeus. 



latipes, Hook. Stout, rigid stem, 1 to 3 in, long; leaves longer: pods long-winged, 

 dictyotum, Gr. var. acutidena Gr. Stem slender, 1 to 3 in. high, 

 oxycarpviin, T. & G. Slender: petals none: stamens 2: smooth pods nodding, 

 nitidum, Nutt. Petals small: pods shining, acutely margined, 

 strictum. Often matted: sepals persistent: pods erect in dense racemes. 

 Menziesii, DC. Hispid or pubescent: petals none: pods glabrous, 

 lasiocarpum, Nutt. Rough-pubescent: pods hispid on margin. 

 Virginicum, L. Smooth stem erect, at length leafless below, paniculate. 

 Draba, L. Perennial: leaves not lobed: petals large: pods cordate, 

 campestre, L. Stout: leaves serrate: pods ovate, broadly winged, scabrous. 



24. SENEBIERA, De Candolle. • 



1. S. didyma, Pers. Racemes opposite pinnatifid leaves. Ill-scented. 



25. HETERODRABA, E. L. Greene. 

 1. H. uliilateralis, Greene. Branching, nearly prostrate; pedicels reflexed. 



26. ATHYSANUS, E. L. Greene. 



1. A. pusillus, Greene. Very slender (Thyaanocarpvs puaillus, HookBr). 



27. THYSANOCARPUS, Hooker. 



1. T. cxirvipes, Hook. Leaves clasping: border of pods often perforate. 



2. T. laciniatus, Nutt. More slender: leaves scarcely clasping: pods entire. 



3. T. radians, Benth. Glabrous: pods with radiating ribs, 4 or 5 lines broad. 



28. RAPHANUS, Linnaeus. 



1, R. sativus, L. Petals veiny, color variable: pithy pods 1 to 1^ in. long. 



2. R. Raphan;stnim, L. Similar: pods more constricted between seeds. 



CAPPARIDACE^. 



1. ISOMERIS, Nuttall. 



1, I. arborea, Nutt. Yellow flowers in bracteate racemes: stamens exserted. 



2. CLEOME, Linnaeus. 



1 . C. platycarpa, Torr. Erect annual: yellow flowers corymbose; pod hanging. 



