CRUCIFEKjE. 23 



natifid: pods terete, 1 1% in. long, less than a line wide, erect or ascend- 

 ing on very short pedicels. Not as common as the last. 



15. BURSA, Siegesb. 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. Usually hirsute at base, otherwise glabrous, 

 erect, }- 2 ft. high, the stems racemose almost from the base, simple or 

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

 runcinate pinnatifid, or oblanceolate with coarse teeth; cauline sagittate, 

 entire or toothed: pods cuneate-triangular, rtluse, 1 2 lines long and 

 broad, on rather long spreading pedicels. Cosmopolitan weed, flourish- 

 ing with us at all seasons. 



2. B. divaricata (Nutt.), O. Ktze. Slender, often diffusely branching 

 and decumbent or procumbent, 3 8 in. high : lowest leaves sinuate-pin- 

 natifid; cauline entire or nearly so: petals minute, 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 Borders 

 of salt marshes. March May. 



16. LEPIDIUM, Diosc. 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 obcompressed, emarginately 2- 

 winged at summit; valves acutely carinate; cells 1-seeded. Seeds not 

 winged; cotyledons usually incumbent, rarely accumbent. 



* Annuals; pedicels flattened. 

 >i Pods reticulated, 



1. L. latipes, Hook, Branches stout and depressed, far surpassed by 

 the leaves; these several inches long, irregularly and coarsely pinnatifid, 

 the segments linear, entire or lobed; pubescence scanty on the leaves, 

 more dense on the branches, hispidulous: 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 

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

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

 May. 



2. L. dictyotum, Gray. Habit and pubescence of the preceding, but 

 much smaller, the branches at length ascending: leaves narrowly linear, 

 entire or with a few narrow divaricate linear lobes : petals little exceed- 

 ing the sepals or wanting: pods rounded, 1% lines broad, emarginate, 



