338 BRASSICACEAE 



subequal, ascending. Petals light yellow, clawed. Stamens 6; filaments unap- 

 pendaged. Pod elongate, narrowly cylindric, terete; style none; stigma slightly 

 2-lobed. Seeds in one row, numerous, marginless. Cotyledons incumbent. 

 [Sisymbnum L., in part.] 



18. N. altissima (L.) Britton. Tall annual; stem freely branching, 6-12 

 dm. high, sparingly ciliate; leaves pinnatifid, the lower with oblong or lanceolate, 

 the upper with narrowly linear divisions; sepals oblong, 5 mm. long; petals yel- 

 lowish white, spatulate, 6-8 mm. long; pedicels and pods ascending-spreading, 

 the latter, 7-10 cm. long, 1 mm. thick, sessile. Sisymbrium altissimum L. 

 Waste places: Que. — -D.C— X.M. — Calif. — -B.C.; nat. from Eu. Plain. My- 

 Au. 



20. BRAYA Sternb. & Hoppe. 



Perennials, with a stout root, cespitose at the base. Flowers perfect, race- 

 mose. Sepals short, ovate, equal at the base. Petals obovate, clawed. Fruit 

 oblong, flattish; valves faintly 1-nerved; stj'le short; stigma more or less 2-lobed; 

 partition with transversely elongated reticulations. Cotyledons incvunbent. 



1. B. purpurascens (R. Br.) Bimge. Perennial, with a taproot; leaves 

 fle?hy, spatulate or oblanceolate, glabrous, or ciliate towards the base, 1-2 cm. 

 long; stems several, scapiform, 1 dm. high or less, more or less pubescent; sepals 

 purpUsh, 2 mm. long; petals white or pinkish, broadly spatulate; pods oblong, 

 8-10 mm. long, sparingly hairy. Alpine-arctic stations: Greenl. — Lab. — Alta. 

 — Alaska; Spitzbergen. Alp. Jl-Au. 



21. SOPHIA Adans. Tansy Mustard. 



Annual or biennial (all ours), or perennial herbs, or rarely suifruticose, pubes- 

 cent with short branched hairs. Leaves usualty twice pinnatifid to finely dis- 

 sected, or in one of our species merely pinnately lobed or toothed. Flowers in 

 elongate racemes. Sepals narrow, subequal, ascending, early deciduous. 

 Petals yellow or yellowish white, rarely pure white. Pod linear or club-shaped; 

 style short; stigmas minute, entire; valves one-nerved. Seeds in 1 or 2 rows in 

 each cell. Cotyledons incumbent. 



Leaves all pinnately dissected; pod not twisted. 

 Pedicels ascending or spreading. 



Pods linear, 1 inm. wide, somewhat curved; seeds uniserial. 



Stem simple or with erect-ascending branches; pods 8-25 mm. long. 

 Pods 15-25 mm. long; leaves mostly thrice pinnatifid. 



Inflorescence elongate; pods nearly erect; pedicels about 1 cm. long. 



1. S. Sophia. 

 Inflorescence short; pods spreading; pedicels about 0.5 mm. long. 



2. S. sophioides. 

 Pods 8-15 mm. long; leaves once or twice pinnatifid. 



Stem glabrous, dr sparingly stellate or glandular puberulent. 



Leaf-segments all narrow, linear or oblong, or those of the lower 

 leaves broad and obtuse, more or less grayish stellate. 

 Stem grayish stellate, not at all glandular; leaf-segments all 



narrow. 3. 5. gracilis. 



Stem very sparingly stellate, often glandular-puberulent ; seg- 

 ments of the lower leaves broad, very obtuse. 



4. S. californica. 

 Leaf-segments all broad, lanceolate or ovate, thin and bright green. 

 Pods divergent ; primary segments of the uppermost leaves often 



entire. 5. S. leptophylla. 



P :ids ascending ; primary segments of the leaves all sharply cut- 

 lobed. 6. S. incisa. 



Stem densely glandular-pubescent. 7. S. riscosa. 



Stem diffusely branched; pods 5-8 mm. long. 8. S. purpurascens. 



Pods more or less clavate, 5-12 mm. long, 1-2 mm. wide; seeds usually more or 

 less biserial. 

 Pods 8-12 mm. long, mostly erect on spreading pedicels. 

 Leaves and stem green, only sparingly stellate. 



Stem divaricately branched; branches making with the stem an angle 

 of 45 degrees or more; pedicels 7-10 mm. long, usually shorter 

 than the pod. 9. S. ramosa . 



Stem simple or with almost erect or strongly ascending branches. 

 Petals much exceeding the sepals. 



Terminal segments of the upper leaves usually elongate, linear, 

 entire; segments all narrow. 10. S. Jilipes. 



