CRUCIFERAE (MUSTARD FAMILY) 21 



stems usually many from the enlarged crown of the biennial (possibly perei 

 nial) root, decumbent-spreading, 1-2 dm. long: leaves pinnatifid, sometimi 

 bipinnatifid, with short acute segments; the upper tending to become entin 

 flowers in dense racemes: sepals oblong-oval, half as long as the white petali 

 silique elliptic to suborbicular. — ^Dry saline soils; Montana to NewMexio 

 and far westward. 



6. Lepidium Jonesii Rydb. Bull. Torr. Bot. Club 29: 233. 1902. Glabroi 

 biennial or sometimes perennial: stem simple below, branching freely froi 

 the base upward, 2-3 dm. high: basal leaves pinnatifid with linear acute d 

 visions; stem leaves similar but becoming linear and entire above: sepa 

 oblanceolate, obtuse, much shorter than the white petals: silique ovati 

 emarginate; style short, enlarged upward toward the rather large circula 

 stigma. (L. brachybotryum Rydb. 1. c.) — Western Colorado and in Utah. 



7. Lepidium apetalum Willd. Sp. PI. 3: 439. 1801: Glabrous annual, wit 

 erect stem, generally simple below and more or less paniculately branche 

 above but sometimes very freely branched throughout, 1-2 dm. high: leavt 

 usually pale green; the lower more or less incisely toothed or pinnatific 

 flowers apetalous: stamens only 2: raceme appearing contracted just belo' 

 its summit: silique orbicular, glabrous, the stigma sessile in the evidei 

 notch. — ^Very widely distributed; across the continent northward; sout 

 through the Rocky Mountains to New Mexico. 



8. Lepidium divergens Osterh; Bull. Torr. Bot. Club 30: 237. 1903. Biei 

 nial, minutely pubescent, divergently branched from the base: radical leavt 

 broadly spatulate, more or less dentate, short-petioled; cauline smaller an 

 mostly entire: racemes long, with horizontal pedicels: petals wanting: capsul 

 elliptic, glabrous, emarginate, 3 mm. long. — In the mountains; northwester 

 Colorado. 



9. Lepidium medium Greene, Erythea 3: 36. 1895. Glabrous annual, th 

 stem simple below, usually sparingly branched upward, 2-4 dm. high: leav< 

 narrowly lanceolate, more or less toothed but scarcely pinnatifid;. the uppf 

 linear and entire: pedicels slender; early divaricate: petals small but eviden 

 stamens 2 or 4: silique orbicular, retuse, the stigma sessile. L. intermedium- 

 From Texas to Idaho and Calif omia.^ 



10. Lepidium ramosissimum A: Nels. Bull. Torr. Bot. Club 26: 124. 189! 

 Obscurely pruinose-pubescent biennial, profusely branched; the branch* 

 either divaricate and crowded the whole length pf an excurrent axis, or di 

 fusely spreading from the base, or both: first year's leaves oblanceolati 

 coarsely toothed; the second year's leaves cauline, oblanceolate, sparsel 

 toothed; the upper entire, linear or oblong: racemes very numerous; th 

 flowers crowded: petals minute : stamens 2 (to 4) : sihque broadly ovate, nearl 

 smooth, the notch relatively broad and deep. L. virginicum. — Plains of soutl 

 western Wyoming and northern Colorado. 



11. Lepidium ramosum A. Nels. 1. c. 125. Obscurely granular-puberulem 

 a simple erect stem from the rosette of the first year's leaves, corymbose! 

 branched from the base up, 1-2 dm. high: leaves much as in the precedini 

 some of the lower cauline often pinnately lobed and rather large: racemi 

 contracted just below the summit, the pedicels spreading after flowerinj 

 sepals subacute, about as long as the narrow spatulate petals: stamens 

 (to 4); silique orbicular narrowly winged around the summit, the sinus dee 

 and narrow. — Western Wyoming and northward and westward. 



12. Lepidium lasiocarpum Nutt. T. & G. Fl. N. A. 1: 115. 1838. Hirsutel 

 white-pubescent: the stem branching from the near base: lower leaves pii 

 nately parted, the lobes rather broad and obtuse; the cauline spatulate, mo] 

 or less dentate: pedicels flattened horizontally: petals minute or none: sti 

 mens 2: siliques orbicular, hispidulous, emarginate, with a narrow sinu 

 — Sandy soils; from southwestern Colorado to "Texas and California. 



13. Lepidium pubecarpum A. Nels. Bot. Gaz. 30: 189. 1900. Annua 

 freely branched from the base and paniculately upward, not much more tha 

 1 dm. high, obscurely puberulent: leaves small, glabrous, linear or somi 

 what spatulate, acute, sometimes remotely toothed: petals wanting: the sepa 



