14 CRUOIFER.E. 



2. A. iiiiirit imiiin (L.), Lam. Perennial, ostensibly glabrous, but a 

 few appressed hairs are revealed by a lens: broad white petals twice the 

 length of the deciduous sepals: pod 2-seeded. Naturalized more exten- 

 sively than the last. 



2. HETERODRABA, Greene. Slender diffuse annual, leafy only near 

 the base, the elongated branches unilaterally racemose throughout. 

 Leaves simple, toothed. Sepals equal. Petals without claw. Stamens 

 6 but equal, 3 on either side of the orbicular compressed ovary. Pod 

 several-seeded, 2-celled by a very thin and filmy partition, indehiscent. 



1. H. unilateralis (Jones), Greene. Pubescent with rigid short 

 branching hairs: leaves cuneate-obovate, coarsely few-toothed above the 

 middle, ^ 1 in. long: branches horizontal and trailing or prostrate, 

 % 2 ft. long, in age rigid and wiry: pods on short rigid defiexed 

 pedicels, 2 lines long, 1^ lines wide, stellate-pubescent and hispidulous, 

 twisted when mature. In fields among growing grain, along the eastern 

 slopes of the Mt. Diablo Eange. Feb. May. 



3. ATHYSANUS, Greene. Habit and character of the preceding, 

 save that the very small orbicular and straight pods are 1 -celled and 

 1 -seeded. 



1. A. pusi llus (Hook.), Greene. Stems filiform, branching from the 

 base, the branches mostly ascending, unilaterally racemose throughout: 

 leaves few, ovate, sparingly toothed, % in. long: fl. minute, often apeta- 

 lous: pods lenticular, more or less uncinate- hispid, scarcely a line long, 

 rather acute at base. Common on hillsides. March, April. 



4. CAMELIXA, Rmlliux. Erect herbs, sparingly branching, with 

 clasping or sagittate leaves, and terminal loose racemes of small yellow- 

 ish flowers. Sepals equal. Petals entire. Filaments without teeth. 

 Silicle obovate or globose, beaked with a persistent style. Seeds several 

 in each cell, oblong, marginless; cotyledons incumbent. 



1. G. SATIVA (L.), Crantz. Pubescent, % 2 ft. high: leaves lanceolate, 

 sagittate at base, nearly entire: pods pyriform with acute base. A weed 

 in fields of grain in many countries; found at Berkeley by Mr. Chesnut 

 in 1887. 



5. ARABIS, Linn. Sepals erect, equal, or two of them slightly 

 saccate at base. Petals white or purple with narrow claw and flat blade. 

 Anthers short, straight, ovate or oblong, scarcely emarginate at base. 

 Stigma entire or 2-lobed. Pod linear, compressed; valves nerveless or 

 lightly 1-nerved. Seeds in one or two rows, flattened, often winged. 



1. A. glabra (L.), Weinm. Stout biennial, usually simple, 2 to 5 ft. 



