90 



CRUCIFEE-fi. 



23. LEPIDIUM, Linnaeus. 



1 . L. iatipes, Hook. Stout, rigid stem, 1 to 3 in. long; leaves longer: pods long* winged 



2. I*, dictyotum, Gr. var. acutidens Gr. Stem slender, 1 to 3 in. high. 



3. L. oxycarpum, T. & G. Slender: petals none: stamens 2: smooth pods nodding, 



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



5. L. strictum. Often matted: sepals persistent: pods erect in dense rfoemes. 



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



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



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



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



10. I*, campestre, L. Stout: leaves serrate: pods ovate, broadly winged, acabrons. 



24. SENEBIEBA, De Candolle. 

 I. S. didyxna, Pers. Racemes opposite pinnatifid leaves. Ill-scented. 



25. HETEBODBABA, E. JL Greene. 

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



26. ATHYSANUS, E. L. Greene. 



1 A. pusillus, Greene. Very slender (Thysanocarpus pusillus. Hooker)- 



27. THYSANOCABPUS, Hooker. 



1. T. curvipes, 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. BAPHANUS, Linnaeus. 



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



2. R. Baphanistroxn, L. Similar: pods more constricted between seeds.' 



CAPPARIDACE.E. 



1. ISOMEBIS, Nuttall, 



L I. arborea, Nutt Yellow flowers in bracteate racemes: etamens exaerted. 



2. CLEOME, Linna3us. 



1 O. platycarps, Torr. Erect annual: yellow flowers corymbose; pod hanging. 



