CRUCIFER.T.. 271 



toothed termiiic^l lobe aud smaller ones of angular outline on the rachis: 

 fl. 4 — 6 liues loug: pods 1 — II3 in. long, ascending, nearly cylindrical, 

 with a stout somewhat 2-edged beak a third as loug as the prominently 

 nerved valves, ofteu containing a seed, the seeds under each valve 3-8. — 

 Common by waysides in the vicinity of Berkeley and Oakland; flowering 

 later than B. cauiprslritf, but earlier than B. nigra. 



19. SISYMBRIUM, Ih'oscundes. Erect and rather slender annuals. 

 Leaves not clasping, lyrate-pinnatifid, or (in our species) finely dissected. 

 Flowers small, yellow. Sepals scarcely gibbous at base. Petals unguic- 

 ulate. Anthers mostly linear-oblong, sagittate. Pods linear or oblong- 

 linear, terete or nearly so, obtuse or short-pointed; valves slightly 1 — 3- 

 uerved. Seeds usually numerous, small, oblong and teretish; cotyledons 

 incumbent. 



* Seeds in 2 rows; leaves finely dissected. 



1. S. cauescens, Nutt. Gen. ii. 68 (1818); Gray, Gen. 111. i. 152. t. 64. 

 Simple or with few branches, % — 2)^ ft. high, canescent with short 

 branching hairs: leaves 1 — 2 pinnate, the segments more or less deeply 

 toothed or pinnatifid: petals 1 line long or less, about equalling the 

 sepals: pods oblong to linear, or subclavate, '%—\4, ^^- lo^gi on slender 

 spreading pedicels of equal or greater length, acute at each end, and 

 beaked with a very short style: seeds ovate-oblong, ig" line long. — Plains 

 near Livermore, thence southward throughout the State. 



* * Heeds in 1 roiu; leaves less dissected. 



2. S. iiicisum, Engelm.; Gray, PI. Fendl. 8 (1849). Glabrous or 

 glandular-hairy, 1 — 2 ft. high, rather freely branching: leaves pinnately 

 divided, the segments lanceolate or linear-lanceolate and incisely serrate : 

 petals lanceolate-spatulate, surpassing the sepals: fruiting racemes 

 elongated, the capillary spreading pedicels about as long as the linear 

 pods, the valves of which are faintly 1-nerved. — In the Sierra Nevada, at 

 6,000 to 10,000 ft. elevation. June— Sept. 



3. S. Hartweg'iauum, Fourn. Sisymb. 66 (1865): S. incisHin, var. 

 Harliregiamim, Wats. Bot. Calif, i. 41 (1876). Size of the preceding, or 

 smaller, cinereous-puberulent, the racemes more regularly panicled: 

 segments of the pinnately parted leaves 5 — 7, oblong, obtuse, often 

 3-lobed: fruiting pedicels and very short acute pods erect and appressed 

 to the rachis more or less closely. — In the Sierra, at rather higher 

 elevations than the last, and less common; also in the Colorado Rocky 

 Mountains, and far northward. This apparently very good species has 

 also been referred to *S'. Sophia of Europe by American botanists. 



* * Seeds in 1 rou:; leaves pinnatifid or entire. 



4. S. OFFICINALE, Scop. Fl. Camiol. ii. 26 (1772); Linn. Sp. PI. ii. 660 



