428 



CRUCIFERAE (MUSTARD FAMILY) 



7.t5. B. arvensis. 

 Stem-leaf and part of 

 fruiting raceme x "^f^. 



756. B. juncea. 

 Stem-leaf and part of 

 fruiting raceme x %. 



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

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



* Beak of the pod large, Jlat or cofispicuously an.jled, ui^iially containing out 

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



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

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



all pinnatitid ; seeds pale. (Sinapis L.) — 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 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. 



3. B. juxcea (L.) Cosson. Xearly 

 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, 

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

 (Nat. from Asia.) Fig. 756. 



4. B. jAPoxicA Siebold. (Curled M.) Leaves crisped and much cleft: 

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

 (Introd. from Asia.) 



5. B. nigra (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 w^aste 

 places, common. (Nat. from Eu.) 

 Fig. 757. 



* * * Leaves cordate- or auricii- 

 Idte-clasping at the base. 



6. B. CAMPESTRIS L. (RlTA- 



baga.) Glaucous, hlspidulous with 

 scattered hairs at least when 

 young ; leaves lyrately lobed ; 

 flowers rather large, pale vellow 

 (Fig. 758); also^ B. NX pus L. 

 (Rape), which is very similar but 

 entirely glabrous ; and B. Rapa 

 L. (Turnip), which is greener, and lias 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 Bj^assica. — 

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

 to the biseriate seeds.) 



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

 leafv only near the branching ba.se ; leaves oblong, toothed or somewhat pin- 



