428 



CRUCIFERAE (MUSTARD FAMILY) 



1. B. 



pedicels, 



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

 incised, or pinnatifid. ('I'he Latin name of the Cabbage.) 



* Beak of the pod large, flat or conspicuously angled, usnaUg containing one 

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

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

 moi'e than half their length occupied by the sword-shaped beak ; leaves 

 all pinnatifid ; seeds pale. {Sinapis L.) — Cultivated, and 

 occasionally spontaneous. (Introd. from Eu.) 



2. B. ARVENSis (L.) Ktze. (Chaklock.) Knotty pods 

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

 leaves rhombic, scarcely petioled, 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. 



Ibb. B. arvens 

 Stem-leaf and part of 

 fruiting raceme X %. 



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

 glabrous, somewhat glaucous; upper 

 leaves oblong, subentire, attenuate at 

 the base ; the lower lyrate ; pedicels 

 slender, spreading ; pod at length 8.5 cm. long. — Roadsides, '^^^- B. juncea. 

 grain-fields, etc., recently introduced but already common. Stem-leaf and part of 

 (Nat. from Asia.) Fig. im. ^^"^^^^"^ ^'^^^"^^ ^ '/a* 



4. B. JAPONICA Siebold. (Curled M.) Leaves crisped and much cleft; 

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

 (Introd. from Asia.) 



6. B. NiGKA (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 axiricu- 

 late-clasping at the base. 



6. B. campestrts L. (Ruta- 

 baga.) Glaucous, hispidulous with 

 scattered hairs at least when 

 young ; leaves lyrately lobed ; 

 flowers rather large, pale yellow 

 (iMG. 758); also B. NXpus L. 

 (Rape), which is very similar but 

 entirely glabrous ; and B. Rapa 

 L. (Turnip), which is greener, and has smaller brighter yellow 

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

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

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

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



757. B. nigra. 

 Leaves and part of fruiting raceme 



758. B. campestris. 

 Stem-leaf and part 



of fruiting raceme 



xVs. 



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. murXlis (L.) DC. Annual or biennial, smooth or sparingly hispid, 

 ^eai V only near the branching base ; leaves oblong, toothed or somewhat pin- 



