270 CRUCIFEK^. 



ClieiraalJmii. Stout and low, ig — l'^ ft. high, spariugly pubescent with 

 appressed bifid or 2-parted liairs; leaves narrow, entire, or sinuately or 

 angularly toothed or lobed: fi. large, cream-color or yellowish, in a 

 depressed terminal corymb, scarcely fragrant: pods in a short raceme; 

 valves nearly flat, with a strong midvein, IVg lines wide, the whole 

 1^ — 23^ in. long, abruptly and stoutly short-pointed: seeds flattened. — 

 Among the sandy or rocky hills of the seaboard only, from Monterey 

 northward to Mendocino Co.; easily mistaken for E. atipertiin, but we 

 have not seen it with even yellow, much less orange-colored flowers. 

 The petals are broader than in that species, but at San Francisco they 

 are invariably almost white. Feb. — May. 



18. BRA.SSICA, Plini/. Large annuals or biennials, with erect often 

 widely branching stems, lyrate or pinnatifid lower leaves, and yellow 

 flowers. Sepals equal at base. Petals unguiculate; limb obovate. 

 Pods linear or oblong, terete or quadrangular, with a stout 1-seeded or 

 seedless beak; valves 1 — 5-nerved. Seeds in 1 row, globose; cotyledons 

 incumbent. — An Old World genus, of which a few species, cultivated 

 everywhere, have become more or less thoroughly naturalized with us. 

 * Sepals erect, enfolding the claws of the petals. — Bbassica proper. 



1. B. CAMPESTRis, Linn. Sp. PI. ii. 666 (1753). Glabrous, glaucous, 

 2 — 3 ft. high: lower leaves somewhat rough-hairy, lyrate with large 

 terminal lobe; cauline oblong or lanceolate with a broad auriculate- 

 claspiug base: fi. 3-4 lines long: pods nearly terete, 2 in. long or more, 

 ascending, on spreading pedicels; the stout beak 8 — 10 lines long. — 

 Abundant in fields, flowering in the late winter and early spring months; 

 commonly but erroneously called Mustard, it is the Turnip of fields 

 and gardens run wild and become naturalized. 



* * Sepals spreading, releasing the claws of the petals. — 

 Genus Sinapis, Tourn. 



2. B. NIGRA, Koch; Riehl. Deutsch. FI. iv. 713 (1833); Linn. Sp. PI. 

 ii. 668 (1753), under Sinapis. (Black Mustard). Not glaucous but 

 dark green, roughish with scattered stiff hairs, stout, 3 — 12 ft. high: 

 leaves all petiolate; the lower lyrate, with a very large and lobed terminal 

 lobe; the uppermost lobed or toothed or entire: petals 3 — 4 lines long, 

 twice the length of the yellowish sepals: pods closely appressed to the 

 rachis of the raceme, 4-angled, ^2 — H iii- ^ong, sharply beaked with the 

 long style. — Common as the preceding, but taking more exclusive 

 possession of fence corners and rich waste lands; flowering only in early 

 summer; the root strictly annual. 



3. B. SiNAPiSTRUM, Boiss. Sinapis arvensis, Linn. Sp. PI. ii. 668 

 (1753). (Charlock). Annual, the herbage light green, rough with 

 spreading hairs, 2 — 5 ft. high: lo"vyer leaves usally with a large coarsely. 



