MUSTARD FAMILY 345 



scarcely 2 mm. wide. B. americana Rydb. Wet places in the mountains: 

 Mont.— Colo.— Utah— Wash.— B.C. Plain— Mont. Je-Jl. 



2. C. stricta (Andrz.) W. F. Wight. Biennial; stem erect, 3-6 dm. high, 

 glabrous; petals light yellow; pods about 2.5 cm. long, stout, erect and appressed 

 against the rachis. B. s/rida Andrz. Waste places: Que.— Sask. — Wyo. — Fla.; 

 Wash. — Ida.- — Calif.; nat. from Eurasia. Ap-Je. 



3. C. verna (Michx.) HeUer. Biennial; stem branched, 3-6 dm. high; leaves 

 ■with rounded or elliptic divisions; petals yeUow, about 5 mm. long; fruiting 

 pedicels ascending, stout, angled; pods 5-6 cm. long, straight or nearly so, ascend- 

 ing, sharply angled. B. praecox (J. E. Smith) R. Br. Waste places: N.Y. — 

 Fla. — Colo.; Calif. — Wash.; adv. from Eu. Mj'-Je. 



28. RAPHANUS L. Radish. 



Leafy annuals or biennials. Flowers perfect, in racemes. Sepals erect, the 

 lateral ones somewhat saccate at the base. Petals large, pale yellow, white or 

 light purple. Pod terete, tapering into a distinct beak, one-celled or trans- 

 versely divided by several false partitions, more or less moniliform. Seeds 

 globular, pendulous. Cotj'ledons conduphcate. Stamens unappendaged. 



1. R. sativus L. Annual or biennial; stem branched, 4-5 dm. high, gla- 

 brous or nearly so; lower leaves Ij'rate-pinnatifid with rounded, crenate divisions, 

 more or less hairj^, the uppermost lanceolate; petals 15-20 mm. long, with long 

 claws, white and tinged with yellow; pod 4-5 cm. long; body 7-8 mm. thick, 

 gradually tapering into a long beak. Waste places: Que. — B.C. — -Calif. — -Fla.; 

 — W. Ind.; escaped from cultivation. Plain — Submont. F-N. 



29. SINAPIS L. Mustard, Charlock. 



Annual or biennial, caulescent herbs, more or less hirsute. Flowers perfect, 

 in racemes or panicles. Leaves alternate, nmcinate-pinnatifid or lobed. Sepals 

 more or less spreading, equal or the outer slightly saccate at the base. Petals 

 yellow, longer than the sepals, clawed. Filaments not appendaged. Pods 

 elongate, nearly terete, more or less constricted between the seeds, the upper 

 portion, containing one seed, produced into a broad and sword-shaped or more or 

 less 4-angled beak. Seeds in one row in each cell, globose, marginless and wing- 

 less. Cotyledons conduphcate. 



Beak sword-shaped, constituting more than half the length of the pod. 1. S. alba. 



Beak somewhat 4-angled, but flattened and 2-edged, constituting about one-third the 

 length of the pod. 2. S. arvensis. 



1. S. alba L. Annual; stem 3-6 dm. high, more or less hispid; leaves more 

 or less hirsute, the lower pinnatifid, with rounded toothed divisions, the upper- 

 most often entire; petals yellow, alsout 1 cm. long; pedicels in fruit spreading; 

 pod densely hispid, about 3 cm. long. Waste places and fields: Me. — Fla. — ■ 

 Calif. — B.C.; nat. from Eu. Plain— Submont. Mr-Au. 



2. S. arvensis L. Annual; stem 3-6 dm. high, more or less hirsute, or gla- 

 brous above; lower leaves lyrate-pinnatifid, with a rounded toothed terminal 

 lobe, usually hispid on the veins beneath; upper leaves oblong or lanceolate, 

 merely toothed; petals bright yellow, 8 mm. long; pedicels ascending, about 5 

 mm. long; pods ascending, 3-4 cm. long; beak about 5 mm. long. Brassica 

 arvensis (L.) B.S.P. B. Sinapistrum Bois. Fields and waste places : Me. — Fla. 

 — Calif. — Wash.; W. Ind.; nat. from Eu. Plain — Submont. My-S. 



30. ERUCA (Tourn.) Mill. Garden Rocket. 



Annual or biennial, branching herbs. Leaves pinnately lobed or toothed. 

 Flowers perfect, large, racemose. Petals yellowish or purplish, with bro^Ti or 

 violet veins. Pod hnear, with a long sword-shaped beak; valves with a single 

 strong and several faint nerves; seeds in two rows. 



1. E. Eruca (L.) Britton. Annual; stem glabrous, 3-4 dm. high; lower 

 leaves pinnatifid or lobed, the upper often merety dentate; petals strongly veined; 

 pod 1.5 cm. long or moie, erect on erect pedicels. E. saliva Lam. Waste places: 

 Ont.— Pa.— Mo.— N.M.— Mont.; adv. from Eu. My-O. 



15* 



