226 Karl M. Wiegand and Arthur J. Eames 



b. Flowering part of raceme 10-25 cm. long (except toward end of flowering 

 season) ; petals 13-20 mm. long, pale ; sepals somewhat saccate at base, erect ; 

 pods rather fleshy, 6-11 cm. long, 4-5 mm. wide; beak 5-10 (13) mm. long, 

 stout, often swollen and 1-seeded, the stigma prominent ; upper cauline leaves 

 scarcely clasping, mostly narrowly oblong, obtuse and toothed ; root not 

 tuberous. [B. olcracea] 



b. Flowering part of raceme 2-4 cm. long; petals 5-14 mm. long; sepals not saccate 

 or scarcely so, more spreading; pods less fleshy, 3-8 cm. long, 3-4 (5) mm. 

 wide; beak 8-25 mm. long, more gradual and uniform, without seeds, the 

 stigma less prominent ; upper cauline leaves strongly clasping, more acute, 

 entire or toothed. 

 c. Petals (9) 10-14 mm. long; pod with beak (5) 6-10 cm. long; pedicels ascend- 

 ing ; young fruit straight ; upper cauline leaves narrowly oblong, barely acute, 

 toothed; root not tuberous; (beak 10-17 mm. long, moderately stout; flowers 

 light yellow). • [B. Napus] 



c. Petals 7-1 1 mm. long ; pod 3-8 cm. long ; pedicels spreading ; young fruit 

 often somewhat f alcately upcurved ; upper cauline leaves oblong-lanceolate 

 or ovate-oblong, more acute, entire. 

 d. Beak 8—15 mm. long, moderately stout; pods 5-6.5 cm. long; flowers light 

 yellow, not conspicuously overtopping the buds ; root tuberous. 



[B. Napobrassica] 

 d. Beak 12-25 mm. long, very slender ; pods 3-8 cm. long ; flowers bright 

 yellow, overtopping the buds. 

 e. Foliage glaucous, glabrous or the lower leaves with a few scattered 



whitish hairs; root slender; petals 8-11 mm. long. 1. B. campestris 

 e. Foliage green, rarely glaucous, more or less setose-hispid ; root tuberous ; 

 petals about 7 mm. long. [B. Rapa] 



a. Upper cauline leaves tapering at base ; foliage scarcely glaucous, glabrous or 

 hairy, thin; (petals small, 6-14 mm. long, bright yellow; sepals usually spread- 

 ing; fruiting pedicels spreading or appressed ; pods 1-7 cm. long, 1-5 mm. wide). 

 b. Beak much narrower than body of pod, one-ninth to one-quarter the total length 

 of the fruit, not flattened, seedless; valves 1-nerved or nearly so; pods not 

 constricted. 

 c. Pods 2.5-7 cm. long, more or less spreading ; pedicels 7-10 mm. long ; plant 



low. 2. B. juncea 



c. Pods 1-2 cm. long, appressed; pedicels 3-7 mm. long; plant tall. 



3. B. nigra 

 b. Beak not much narrower than body of pod, one-fourth the total length of the 

 fruit or more, flattened, usually containing a seed in the basal part. 

 c. Fruiting pedicels 4-7 mm. long, stouter ; pods moderately slender, 2 mm. in 

 diam., glabrous or hispid, ascending, scarcely monilif orm-constricted ; nerves 

 prominent, at least when dry ; beak one-fourth to one-third the total length 

 of the fruit ; leaves sparingly lyrate, the upper ones usually undivided. 



4. B. arvensis 

 c. Fruiting pedicels about 10 mm. long ; pods stout, 4 mm. in diam., hispid, 

 spreading at right angles, moniliform-constricted ; nerves indistinct; beak 

 very broad and flat, usually more than one-half the total length of the fruit; 

 leaves more lyrate. [B. alba] 



[B. OLERACEA L. CABBAGE AND KALE. 



Occasional in fields and on dumps, but probably not spontaneous ; commonly culti- 

 vated. The plants are very diverse, some probably being cabbage and others various 

 types of kale. 



Native of Eu.] 



