CRUCIFER^. 273 



22. BURSA, Siegesheck. Slender nearly glabrous annuals, with simple 

 or pinnate leaves, and small white flowers. Pods oblong or obcordate, 

 more or less obcompressed, oo -seeded; valves carinate, 1-nerved. Seeds 

 not winged; cotyledons incumbent. 



1. B. PASTORis, Wigg. Prim. Fl. Hols. 47 (1780). Thlaspi Bursa 

 pasioris, Linn. Sp. PI. ii. 647 (1753). Capsella Bursa pastons, Moench, 

 Meth. 271 (1794). Usually hirsute at base, otherwise glabrous, erect. 

 }y^ — 2 ft. high, the stems racemose almost from the base, simple or with 

 few branches: radical leaves usually in a depressed rosulate tuft, runci- 

 nate-pinnatifid, or oblanceolate with coarse teeth; cauline sagittate, 

 entire or toothed : pods cuneate-triangular, retuse at summit, 1 — 2 lines 

 long and broad, on rather long spreading pedicels; seeds minute. — A 

 thoroughly cosmopolitan weed, but native of the Old World; commonly 

 called Shepherd's Purse; flourishing with us at all seasons of the year. 



2. B. (livaricata, O. Ktze. Rev. Gen. 21 (1891). Hymemjlohus dirari- 

 catus, Nutt. (1838). Capsella divaricala, Walp. Slender, often diffusely 

 branching and decumbent or procumbent, 3 — 8 in. high: lowest leaves 

 sinuate-pinnatitid; cauline entire or nearly so: petals miniite, barely 

 equalling the sepals: pod oblong or ovoid, little flattened, 2 lines long or 

 less; obtuse, the valves rather thin; pedicels slender, longer than the 

 pods. — Common everywhere, along the borders of salt marshes; in appear- 

 ance very unlike B. pasioris, and perhaps better received as a distinct 

 generic type. Mar. — May. 



23. LEPIUIUM, Dioscorides. Low herbs, with pinnatifid or toothed 

 leaves, and small white or apetalous and greenish flowers. Stamens 

 only 4, or even 2. Pod orbicular or ovate, strongly obcomjjressed, 

 emarginately 2-winged at summit; valves acutely carinate; cells 1-seeded. 

 Seeds not winged; cotyledons usually incumbent, rarely accumbent. 



* Annuals; pedicels fialtened. 

 ■i—Pods reiiculaled. 



1. L. latipes, Hook. Ic. t. 41 (1836). Branching from the base, the 

 short branches stout and depressed, far surpassed by the leaves; these 

 several inches long, irregularly and coarsely pinnatifid, the segments 

 linear, entire or lobed; pubescence scant on the leaves, more dense on 

 the branches, hisijidulous : racemes short, dense; pedicels 1 — 2 lines 

 long: sepals very unequal: petals broadly spatulate, ciliate, greenish, 

 exceeding the sepals: pod broadly oval, 2 lines broad, sparingly pubes- 

 cent, strongly reticulate, the broad acute wings nearly as long as the 

 body of the pod.- In saline soils at Martinez, Alameda, Monterey, etc., 

 and in the interior along the lower San Joaquin. Mar., Apr. 



2. L. dictyotuin, Gray, Proc. Am. Acad. vii. 329 (1868). Habit and 



