428 



CKUCIFERAE (MUSTAED FAMILY) 



7.")5. B. arvensis. 

 Stem-leaf and part of 

 fruiting raceme x y^. 



756. B. juDcea. 

 Stem-leaf and part of 

 fruiting raceme x %. 



— Annuals or biennials, with yellow flowers. Lower leaves mostly lyrate, 



incised, or pinnatifid. (The Latin name of the Cabbage.) 



* Beak of the pod large, fiat or conspicuously angled, usually containing one 

 seed in an indehiscent cell ; leaves not clasping at the base. 

 1. B. Alba (L.) Boiss. (White M.) Pods bristly, ascending on spreading 



pedicels, mure than half their length occupied by the sword-shaped beak; leaves 

 all pinnatifid ; seeds pale. (Sinapis 1,.) — Cultivated, and 

 occasionally spontaneous. (Introd. from Eu.) 



2. B. ARVENSIS (L.) Ktze. (Charlock.) Knotty pods 

 fully one third occupied by a' stout 2-edged beak; upper 

 leaves rhombic, scarcely pelioled, merely toothed ; fruiting 

 pedicels short, thick; pods smooth or rarely bristly, 4 cm. 

 long. {B. Sinapistrum Boiss.; Sinapis 

 arvensis L.) — Noxious weed in grain- 

 fields, etc. (Nat. from Eu.) Fig. 755. 



* * Beak smaller, conical, seedless ; leaves 

 not clasping. 



3. B. jiJncea (L.) Cosson. Nearly 

 glabrous, somewhat glaucous; upper 

 leaves oblong, subentire', attenuate at 

 the base ; the lower lyrate ; pedicels 

 slender, spreading ; pod at length 3.5 cm. long. — Roadsides, 

 grain-fields, etc., recently introduced but already common. 

 (Nat. from Asia.) Fig. 756. 



4. B. jap6nica Siebold. (Ccrled M.) Leaves crisped and much cleft; 

 otherwise similar to the last. — Occasionally established after cultivation. 

 (Introd. from Asia.) 



6. B. NtoitA (L.) Koch. (Black M.) Hirsute with scattered hairs, green; 

 leaves slender-petioled, the lower with a very large terminal lobe and a few 

 small lateral ones ; pods short, 1.5-1.8 cm. long, 

 on short erect pedicels, oppressed ; seeds dark, very 

 pungent. — Roadsides and waste 

 places, common. (Nat. from Eu.) 

 Fig. 757. 



* * * Leaves cordate- or ain'icu- 

 late-clasping at the base. 



X< 6. B. CAMPESTRis L. (Ruta- 

 baga.) Glaucous, hispidulous with 

 scattered hairs at least when 

 young ; leaves lyrately lobed ; 

 flowers rather large, pale yellow 

 (Fig. 758); also B. NXpus L. ,„ „ 

 (Rape), which is very similar but '^- ^- """P^stris. 

 entirely glabrous ; and B. RXpa S*<^"l-'^5 '' 

 L. (Turnip), which is greener, and has smaller brighter yellow offr"«"'e>-aoeme 

 flowers and a thickened root ; all tend to escape from or persist 

 after cultivation, and are often noxious weeds. (Introd. from Eu.) B. ocerXcea 

 L. (Cabbage), with broad fleshy glaucous leaves, is occasionally found in a 

 half-wild state. (Introd. from Eu.) 



16. DIPLOTAxIS DC. 



Seeds ovoid, in two rows in each cell ; other characters as in Brassica. — 

 Leaves toothed or pinnatifid ; flowers yellow. (Name from the Greek, alluding 

 to the biseriate seeds. ) 



1. D. MURA.L1S (L.) DC. Annual or biennial, smooth or sparingly hispid, 

 leafv only near the branching base ; leaves oblong, toothed or somewhat pia- 



757. B, nigra. 

 Leaves and part of fruiting raceme 



