30 Sierra Club Publications. 



very small, corymbose, in fruit becoming racemose. Pods terete, 

 with one row of seeds in each part, about half an inch long, on 

 spreading pedicels of the same length, sharp, pointed and curved. 

 This grew at Summit Meadow and at similar places. 



Arabis perfoliata Lam. Tower Mustard. Stems solitary, 

 simple or branching above. Leaves at base hairy, lyrately- 

 pinnatifid or dentate, petioled ; stems leaves ovate, clasping by 

 an auricled base, 2-6 in. long, ^-i^ in. wide, smooth and glau- 

 cous. Flowers white, small ; pods slender, erect, 2-4 in, long. 

 Converse Basin. 



Arabis repanda Watson. Stems stout and branching, very 

 hairy below. Leaves 1-4 inches long, obovate, toothed or entire. 

 Flowers small, tinged with purple. Pods spreading, flat, 2-4 in. 

 long, Yi in. wide, tipped with a style, -i-^ in. wide. The pods 

 vary in width and in the manner of spreading, usually horizon- 

 tally and somewhat curved downwards. The seeds are con- 

 spicuously winged and in two rows. Millwood, Converse Basin, 

 Bubbs Creek, Summit Meadow. 



Arabis platyspertna Gray. Low, branching from the root, 

 glaucous, smooth. Leaves oblanceolate ; radical petioled ; cauline 

 sessile, less than an inch long. Flowers few, rose-color. Pods 

 erect, i-i^ in. long, tipped by a sessile stigma. Only found at 

 the upper elevations at East Lake and Bullfrog Lake. 



Arabis Holboellii Hornem. Biennial, hoary with stellate 

 pubescence ; stems simple or branched, erect, 2-3 feet high. 

 Leaves oblanceolate, 1-2 in. long, entire or sparingly toothed, 

 densely clustered at the base and on the lower part of the stem. 

 Flowers pendent, white or purplish, small. . Pods pendent on 

 deflexed pedicels, becoming 3 in. long, is in. wide, tipped with 

 a sessile stigma. Seeds margined, in one row in each division. 

 Converse Basin, Bubbs Creek. 



Arabis arcuata Gray. Perennial, with many stems from the 

 root, clothed with a dense, white, stellate pubescence. Leaves in 

 tufts at the base, linear to linear-oblanceolate, ^-2 in. long, 

 entire or serrate ; stem leaves clasping by an auricled base. 

 Flowers purplish. Pods on short pedicels, arching downwards, 

 becoming 3 in. long. Seeds in 2 rows, narrowly winged. Con- 

 verse Basin and around Millwood. 



Streptanthus gracilis Eastwood. Biennial, with several 

 slender stems from the root, glaucous and glabrous, a few inches 

 to a foot high. Radical leaves orbicular to narrowly oblong, 

 toothed, those at base on slender petioles as long as the blades, 



