CRUCIFERA. 25


23, LEPIDIUM, Linnwns,


latipes, Hook. Stout, rigid stem, 1 to3 in. long; leaves longer: pods long-winged.
dictyotum, Gr, var. acutidens Gr. Stem slender, 1 to 3 in. high.
oxycarpum, 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, paniculata

Draba, L. Perennial: leaves not lobed: petals large: pods cordate.
campestre, L. Stout: leaves serrate: pods ovate, broadly winged, scabrous,


24, SENEBIERA, De Candolle.
didyma, Pers. Racemes opposite pinnatifid leaves. Ill-scented.
25. HETERODRABA, E. L. Greene.
unilateralis, Greene. Branching, nearly prostrate; pedicels reflexed.
26. ATHYSANUS, E. L. Greene,
pusillus, Greene. Very slender (Thysanocarpus pusillus, Hooker)


27. THYSANOCARPUS, Hooker.
curvipes, Hook. Leaves clasping: border of pods often perforate.
laciniatus, Nutt. More slender: leaves scarcely clasping: pods entire.
radians, Benth. Glabrous: pods with radiating ribs, 4 or 5 lines broad,


28. RAPHANUS, Linnzus.
sativus, L. Petals veiny, color variable: pithy pods 1 to 14 in. long.
Raphanistrum, L. Similar: pods more constricted between seeds,


CAPPARIDACER.
1, ISOMERIS, Nuttall.
arborea, Nutt. Yellow flowers in bracteate racemes: stamens exserted.
2. CLEOME, Linnezus.
platycarpa, Torr. Erect annual: yellow flowers corymbose; pod hanging.
26 VIOLACES.
CISTACHE.
HELIANTHEMUM, Tournefort.
EL scoparium, Nutt. Woody-based stems, slender: flowers yellow. Cent. & S Cal


VIOLACER.
VIOLA, Linnezus.
* Leaves all cordate and reniform.
Stems erect or prostrate: leaves flat...........0cceeceee ceneeeesaceucvas -- 6, 10,
isteulta: AowWerg! white or blues cacsdnccddis Asan eoadatacsisieddsasaaammdensasiales 1,2
** Leaves not all cordate or reniform: not lobed.
