MUSTARD FAMILY 105 



flowering stems, oblong or linear, obtuse, not ribbed, rarely 

 over J4 in. long. Pods linear-oblong, l / A in. long. — Mt. Dana 

 (type locality) and other high peaks; recognized by its white 

 flowers. 



D. crassifolia Graham has been reported from Peregoy's, 

 but an error is suspected. This species is a smooth, green 

 annual or biennial, with only the edges of the leaves sparsely 

 hairy, the lanceolate pods flat, acute, and smooth. 



2. ATHYSANUS. 



1. A. pusillus Greene. Herbage pubescent, the pods with 

 hooked hairs. Leaves mostly basal, broadly 

 oblong, often coarsely toothed, Y\ to Yi in. 

 long. Flowers minute, white, the petals often 

 wanting. Pods very small, in slender racemes, 

 orbicular, flat, not opening at maturity. 



This is a delicate annual, seldom a foot high, 

 best known by its short, bristly pods which 

 cling to clothing, etc. It is plentiful in the 

 Foothill Belt and its range extends to nearly 

 6000 ft. alt. in the mountains. 



3. THYSANOCARPUS. 

 1. T. curvipes Hook. Fringe-pod. Leaves sessile by a 

 clasping base, narrowly lanceolate, inch or 

 two long, the lower usually toothed or pinna- 

 tifid and with stiff hairs (the basal petioled 

 and forming a rosette). Flowers small, white 

 or purplish. Pods 1-seeded, obovate or ellip- 

 tic, flat on one side, curved on the other, 

 broadly margined with a wing which is often 

 perforated. 



The Fringe-pod grows in warm, sandy soil 

 in Yosemite Valley but belongs chiefly to 

 lower altitudes. It is an erect annual, 1 to 2 ft. high, with 

 few branches. The delicate pods, daintily suspended on 

 slender, recurved pedicels of a long and loose raceme, make 

 the plant very ornamental. 



4. LEPfDIUM. Pepper-grass. 

 1. L. densiflorum Schrad. Stem erect, 

 Vz to \y 2 ft. high, with spreading branches 

 above. Leaves green and nearly glabrous, 

 toothed, those of the branches narrower 

 and entire. Fruiting racemes 1 to 6 in. 



