BRASSICACEAE 475 



6. Ovary sessile : style short : stigma 2 lobed. Ovules numerous. Pods slender, slightly 

 angled, the valves nerveless. Seeds in one row in each cavity, or sometimes in two rows. 

 Cotyledons incumbent. Wall Cress. Mouse-ear Cress. 



1. Stenophragma Thaliana (L. ) Celak. Annual, slender. Stems erect, 0.3-5 dm. 

 tall, branched throughout or sometimes simple, glabrous above, pubescent with stiff short 

 hairs near the base : leaves mainly basal, 1-5 cm. long ; blades oblong, elliptic or 

 oblanceolate, obtuse, entire or shallowy-toothed ; petioles as long as the blades or shorter ; 

 stem-leaves similar to the basal but narrower and sessile : pedicels very slender, 4-8 mm. 

 long, spreading or ascending : sepals oblong, 1 mm. long, obtuse : petals white, twice as 

 long as the sepals : pods linear-filiform, 1-1.5 cm. long, spreading or ascending. ISisym- 

 brium Thaliana (L. ) Gay.] 



In sandy soil and waste places, Ontario to Minnesota, Massachusetts, Georgia and Missouri. Spring. 



13. BARBAREA R. Br. 



Biennial or perennial herbs, with upright angled stems. Leaves alternate : blades 

 thickish, lyrate-pinnatifid. Flowers perfect, in racemes or panicles. Sepals 4, equal, erect 

 or nearly so. Corolla yellow, the 4 petals with claws. Stamens 6. Ovary sessile : style 

 short : stigma 2-lobed or nearly capitate. Ovules numerous. Pods elongated, 4-angled, 

 the valves ribbed or keeled. Seeds in 1 row in each cavity, flatfish, marginless. Coty- 

 ledons accumbent. ScuRVY-GRASs. Winter Cress. Rocket. 



Capsules slender-pedicelled, obtusely 4-angled : leaf-segments 3-9. 



Capsules spreading or ascending. 1. B. Barharea. 



Capsules erect and appressed. 2. B. stricta. 



Capsules stout-pedicelled, acutely 4-angled : leaf-segments 9-17. 3. B. praecox. 



1. Barbarea Barbar^a (L. ) MacM. Glabrous or nearly so. Stems 2-7 dm. tall, 



more or less freely branched : leaves numerous ; those near the base of the stem with pin- 



natifid blades 5-15 cm. long, tlie terminal segments much larger than the several lateral 



ones, mostly repand ; ujiper leaves mostly sessile or clasping, toothed or incised : racemes 



many-flowered, elongating : corolla bright yellow, 6-8 mm. broad : petals about twice as 



long as the narrow sepals : pods .spi-eading or ascending, 2-2.5 cm. long, obscurely 4 angled. 



[^Barbarea vulgaris R. Br. ] 



In fields and waste places, Labrador to New York and middle Georgia ; also locally in the interior 

 and on the Pacific coast. Spring. 



2. Baibarea stricta Andrz. Glabrous. Stems 2-6 dm. tall, simple below or branched 

 at the base and above : leaves alternate, 5-15 cm. long ; blades oblong to oblanceolate in out- 

 line, pinnatifid, the segments 3-8, entire or repand, the terminal one much larger than the 

 lateral ones : pedicels erect, 2-5 mm. long : sepals oblong or oblong-lanceolate, 3.5-4 mm. 

 long, obtuse : petals yellow, spatulate, twice as long as the sepals : pods slender, obtusely 

 4-angled, 2-2.5 cm. long, erect or appressed against the rachis. 



In waste places and fields, Quebec to the Northwest Territory, Florida and Nebraska. Spring. 



3. Baibarea prafecox (J. E. Smith) R. Br. Glabrous or nearly so. Stems usually 

 branched at the base, the branches erect or ascending, 1-6 dm. tall, simple or branched : 

 leaves alternate, 2-15 cm. long; blades pinnatifid, the segments 9-17, variable in shape, 

 more or less strongly toothed, the terminal one much larger than the rest ; j^etioles often 

 ciliate : pedicels 2-5 mm. long, spreading or ascending, very stout : sepals oblong to oblong- 

 lanceolate, 3-3.5 mm. long, obtuse: petals yellow, spatulate, at least twice as long as the 

 sepals : pods stoutish, 3.5-8 cm. long, ascending or spreading, sharjily 4-angled, ndt much 

 thicker than the pedicels. 



In fields and waste places, New York to Washington, Florida and California. Spring. 



14. ERYSIMUM L. 



Annual or biennial herbs, the foliage usually pubescent with forked hairs. Stems 

 erect, often branching. Leaves alternate : blades entire, toothed or lobed. Flowers per- 

 fect, in terminal racemes. Sepals 4, erect, equal, 2 gibbous at the base. Corolla yellow, 

 the petals 4, with spreading blades. Stamens 6 : filaments free and unappendaged. Ovary 

 sessile : style short or elongated : stigma 2-lobed. Ovules numerous. Pods elongated, 

 flattish, nearly terete or 4-angled, the valves often keeled by a strong nerve. Seeds in 1 row 

 in each cavity, marginless, or margined at the top. Cotyledons incumbent or nearly 

 accumbent. 



Corolla 4-8 mm. high : pods 1-2 cm. long. 1. E. cheiranthoides. 



Corolla 20-25 mm. high : pods 3-8 em. long. 2. E. Arkansanum. 



