30 BOTANY. 



branched above, the branches terminating in corymbs of 3-6 short racemes, 

 1' long; pods very small, |" in length, ovate, somewhat winged above, 

 scarcely twice longer than the style ; branchlets hispidly pubescent. Pah-Ute 

 Range, Nevada ; 5,000 feet altitude ; October. (123.) 



Lepidium Fremontii. Perennial, erect, diffusely branching, suffru- 

 tescent at base, glabrous, glaucous ; leaves entire or rarely sparingly lobed, 

 linear, obtuse, narrowed at base, somewhat fasicled ; racemes few-flowered ; 

 petals ovate-spatulate, twice exceeding the sepals ; stamens 4 ; pods large, 

 orbicular, wingless, very slightly emarginate ; style short ; cotyledons incum- 

 bent. — Much branched, 1° high ; racemes less than 12-flowered. Gathered 

 by Fremont on the Mohave River in 1844, and now collected on sandy foot- 

 hills near the Humboldt Sink. The amount of material is still scanty, but 

 sufficient to give the characters. Plate IV. Fig. 1. The extremity of a 

 branch ; natural size. Fig. 4. A flower ; enlarged four diameters. (124.) 



Lepidium dictyotum, Gray. Proc. Amer. Acad. 7. 329. Annual, 2-3' 

 high; puberulent throughout ; leaves narrowly linear, entire orpinnatifid with 

 linear lobes ; petals small, oblong, a little exceeding the calyx, or wanting ; 

 stamens 4 ; pods finely reticulated, subovate, somewhat winged at the apex, 

 deeply emarginate, longer than the thick flattened erect pedicel. Racemes 

 strict, shorter than the leaves; siliques becoming nearly 2" long. Near Carson 

 City, Nevada, where it is common under sage-brush ; April ; collected in the 

 same region by Mann and Anderson. In the specimens from which the 

 original description was drawn, the flowers were apetalous and the leaves 

 entire. Plate IV. Fig. 1. A plant; natural size. Fig. 2. A nearly mature 

 pod, showing the calyx and petals ; enlarged four diameters. (125.) 



Lepidium flavum, Torr. Pac. R. R. 8urv., 4. 67. Annual, diff"usely 

 branched, decumbent, glabrous ; leaves rather thick, oblong-spatulate, the radi- 

 cal ones pinnatifid with short rounded lobes, the cauline sparingly toothed or 

 entire ; flowers yellow, capitate ; petals obovate, unguiculate ; stamens 4 ; pods 

 broadly ovate, reticulate, with a broad sinus between the short narrow wings ; 

 style slender, nearly equaling the pod ; cotyledons incumbent. — Stems becom- 

 ing 6' in length, with numerous densely capitate racemes, pedicels reflexed in 

 fruit. Collected by Fremont near Mohave Creek in Western Arizona. Fre- 

 quent about Humboldt Lake, Nevada ; May. (126.) 



Lepidium nanum. Perennial, dwarf, matted-csespitose, glabrous, ex- 

 cepting the pubescent pedicels; leaves crowded, small, ovate-spatulate, 



