CRUCIFERAE. 459 



Lower leaves short-petioled, pinnatifid, lobed, dentate or sometimes entire, 1-2.5 

 cm. long; upper leaves sessile or very nearly so; flowers about I mm. broad; 

 pedicels slender, ascending or spreading, 6-12 mm. long in fruit; pods elliptic or 

 oval, mostly obtuse or emarginate, 3-4 mm. long. In moist ground, often in 

 saline situations, Lab. to Br. Col., and widely distributed in the Pacific States. 

 Also in Europe, Asia and Australia. June-Aug. 



27. BURSA Weber. 



Annual or winter-annual erect herbs, pubescent with forked hairs, the basal 

 leaves tufted. Flowers racemose, small, white. Silicles cuneate, obcordate or 

 triangular, compressed at right angles with the septum, their valves boat-shaped, 

 keeled. Style short. Seeds numerous, marginless ; cotyledons accumbent. 

 [Middle Latin, purse, from the shape of the pod.] About 4 species, natives of the 

 northern hemisphere. In addition to the following, another occurs in western 

 N. Am. 



1. Bursa Bursa-pastoris (L.) Britton. SHEPHERD'S PURSE. (I. F. f. 1752.) 

 Branching, 1.5-5 dm. high from a deep root, pubescent below, mainly glabrous 

 above. Basal leaves lobed, pinnatifid, or rarely entire, 5-15 cm. long; stem-leaves 

 few, lanceolate, auricled; flowers about 2 mm. long; pedicels 11.5 cm - l n * n 

 fruit; pods triangular, cuneate at the base, truncate or emarginate, 4-8 mm. long; 

 seeds 10 or 12 in each cell. In fields and waste places, very common. Nat. from 

 Europe. Jan.-Dec. 



28. CAMELINA Crantz. 



Erect annual herbs, with entire toothed or pinnatifid leaves, and small yellow- 

 ish flowers. Silicles obovoid or pear-shaped, slightly flattened; valves very con- 

 vex, I -nerved. Seeds oblong, marginless, in 2 rows. Stigma entire; style slender. 

 Cotyledons incumbent. [Greek, low flax.] About 5 species, natives of Europe 

 and Asia. 



Glabrous or nearly so ; pod 6-8 mm. long. i. C. sativa. 



Pubescent, at least below ; pod 4-6 mm. long. 2. C. microcarpa. 



T. Camelina sativa (L.) Crantz. GOLD-OF.PLEASURE. FALSE FLAX. 

 (I. F. f. 1753.) Glabrous, or nearly so, 3-6 dm. high. Lowest leaves petioled, 

 5-8 cm. long, lanceolate, acutish; upper leaves sessile, smaller, clasping by a 

 sagittate base, mostly entire; pedicels slender, spreading or ascending, 1-2 cm. 

 long in fruit; flowers numerous, about 6 mm. long; pod obovoid or pyriform, mar- 

 gined, slightly flattened, 6-8 mm. long; style slender, 3 mm. long. In fields and 

 waste places, frequent or occasional throughout our area. Adventive or nat. from 

 Europe. June-July. 



2. Camelina microcarpa Andrz. SMALL-FRUITED FALSE-FLAX. (I. F. f. 

 I 753 a -) Stem pubescent, at least below. Leaves lanceolate, sessile, auricled, or 

 the lower narrowed at the base; fruiting racemes much elongated, often 3 dm. 

 long or more; pedicels relatively somewhat shorter than those of C. sativa; pod 

 rather more flattened, 4-6 mm. long, strongly margined. In waste places, R. I. 

 to W. Va., Idaho, Br. Col. and Kans. Nat. or adventive from Europe. May-July. 



29. NESLIA Desv. 



Annual erect branching herbs, hispid with branched hairs, with entire leaves, 

 and small yellow racemose flowers. Silicles small, globose, wingless, reticulated, 

 indehiscent, i -celled, i -seeded or rarely 2-seeded. Style filiform. Seeds horizon- 

 tal; cotyledons incumbent. [Dedicated to J. A. N. De Nesle, a French botanist.] 

 A monotypic genus of Europe and eastern Asia. 



i. Neslia paniculata (L.) Desv. BALL MUSTARD. (I. F. f. 1754.) Slender, 

 rather densely rough-hispid. 3-6 dm. high. Leaves lanceolate, sagittate-clasping 

 at the base, 2-6 cm. long, 4-16 mm. wide; racemes elongated; flowers yellow, 

 nearly 2 mm. broad; pedicels filiform, ascending. 6-io mm. long in fruit; silicles 

 about 2 mm. in diameter. In waste places, Ont., Manitoba and Br. Col., and in 

 ballast about the eastern seaports. Adventive or fugitive from Europe. May-Sept. 



