21 CEUCIFEIIJS. (MUSTAED FAMILY.) 



one row globose; cotyledons infolding the radical. Lateral sepals usually gibbous. 

 Petals yellow. 



1, B. campestris, L. Smooth; lower leaves pinnately divided, with a large ter- 

 minal lobe; the upper leaves oblong or lanceolate, with a broad clasiDing base; pods 2 

 inches long or more. 



2. B. nigra, Boiss. Larger; leaves all petibled; pods less than an inch long. 



Not to be confounded with Sisymbrium oCBcinale, Scop., which has runcinately 

 pinnatifid leaves, small yellow flowers and closely appressed, subulate sessile pods half 

 an inch long; or, with S. acutangulum, DC, similar to the last, but the pods on short 

 pedicels, erect and over an inch long. The last are called Hedge Mustards. 



6. TROPIDOCARPUM, Hook 



Pod Imear, flattened, often 1 -celled by the disappearance of the narrow partition. 

 Seeds in two rows, minute; cotyledons incumbent. A low hirsute branching annual, 

 with pinnately divided leaves, and yellow, solitary axillary flowers. 



1. T. gracile, Hook. Stems weak; petals IJ to 3 lines long, broad; pods 6 to 20 

 lines long, pointed at both ends. 



7. CAPSELLA, Moench. SnEPHERc's Purse. 



Pod obcordate, much flattened, many-seeded; cotyledons incumbent. Slender and 

 mostly smooth aimuals, with minute flowers. 



1. C. Bursa-pastoris, ISIoench. Somewhat hirsute at base; radical leaves mostly 

 runcinate-pinnatifid, the cauline lanceolate, clasping. 



2. C. divaricata, Walp. Very slender; pods elliptic-oblong; is more rare. 



8. LEPIDIUM, L. Peppergbass. 



Pod orbicular or obovate, emarginately 2- winged at the summit; the cells 1 -seeded. 

 Low herbs, with pinnatifid or toothed leaves, and small wliite flowers; the petals in 

 some species wanting, and the stamens only 2 or 4. 



1. L. latipes, Hook. Stems stout, simple 1 to 3 inches high, surpassed by the 

 irregiilarly and coarsely pinnatifid leaves; racemes capitate, in fruit an inch long or less; 

 Bepals very unequal; pod strongly reticulated, the acute wings nearly as long. 



2. L. 022ycarpum, Torr, & Gr. Stems simple or branched 3 to 6 inches high; 

 smooth; raceme lax, elongated; pod smooth, rounded, nodding, the broad acute teeth 

 ehort and divergent; petals none. 



3. L. uitidum, Nutt. Similar to the last, but larger; petals present; pods smooth 

 and shining, acutely margined. 



4. L. Menziesii, DC. Hispid; petals none; pods not margined, except by the 

 very short teeth at the summit. 



t 



