MUSTARD FAMILY. 



213 



petioles, midribs and margins of leaves hispidulous; leaves coarsely 

 and unequally toothed, the lower petioled and sometimes pinnatifid, 

 the uppermost sharply denticulate or entire; flowers yellowish, 4 

 lines long; sepals oblong, broadest toward the acute apex; which 

 usually bears a few hairs; petals undulate, the claw as broad or 

 broader than the blade, little exceeding the sepals; ovary hairy; fruit 

 unknown to us. — (T. Hookeri Greene.) 



Mt. Diablo region (Livermore, Greene, Mar. 10, 1889) to Mon- 

 terey, Douglas, about 1830. Description drawn from Greene's speci- 

 mens which match fairly well the illustration of Douglas' specimen 

 in Hooker's Icones, figured under the name of Streptanthus flavescens 

 Hook. Very doubtfully distinct from the preceding. 



Annuals or a few biennials, often glaucous. Radical leaves com- 

 monly toothed or pinnatifid, the cauline similar or entire, often 

 sagittate-clasping. Sepals of the same color as the petals, two or all 

 saccate at base, the calyx thus ovoid or broad at base and contracted 

 above or by the spreading of the tips becoming somewhat flask- 

 shaped, rarely subcylindric. Petals purple or white, with a narrow 

 undulate or crisped limb and channeled claw, regular or somewhat 

 irregular as in no. 6. Stamens tetradynamous, or in 3 unequal pairs, 

 the 2 longer pairs with filaments connate below or the uppermost 

 pair with entirely united filaments. Silique oblong to narrowly 

 linear, flattened parallel to the partition, sometimes subterete; valves 

 1-nerved or rarely carinate. Seeds flat, margined or winged. 

 Cotyledons accumbent. Receptacle enlarged. (Greek streptas, 

 twisted, and anthos, flower, in reference to the petals.) 



Upper leaves oval or orbicular and cordate-clasping. 

 Filaments all distinct or one pair connate; biennial, the flowering stems 



Upper leaves mostly narrow; filaments of longer stamens connate in pairs; 

 annuals. 



Herbage glabrous; 2 pair of filaments connate. 

 Some lower leaves broadly ovate; flowers very short-pediceled ; petals 



purple and white 3. S. Breweri. 



Cauline leaves all linear; petals white. 



Flowers subsessile; sepals with whitish tips 4. S. barbiger. 



Flowers long-pediceled; sepals dark purple or black 



5. S. niger. 



Herbage hispid-pubescent or hirsute; upper pair of filaments connate. 

 Leaves mostly narrow. 



Flowers purple; raceme not 1-sided 6. S. glandulosu*. 



Flowers pale; raceme 1-sided 7. S. secundus. 



Some leaves obovate; petals purplish with white tips 8. S. hispidus. 



1. S. suffrutescens Greene. Biennial (sometimes annual?), 

 herbage glabrous; branches 6 to 15 in. long from a stout indurated 

 trunk 6 to 9 in. high and nearly 3 lines thick; lower leaves broadly 

 oblong or cuneate, obovate, coarsely serrate-toothed, narrowed at 

 base into a winged petiole, 1£ to 2\ in. long; upper leaves orbicular 

 with cordate-clasping base, £ to 1 in. broad; petals white, with purple 

 veins, 4 lines long; pods arcuate, 2£ to 3 in. long, 1 line wide. 



2. STREPTANTHUS Nutt. 



from an indurated stock 

 Filaments distinct; annual . 



