30 CRUCIFERJE. (mustard FAMII-V.) 



2. L. globosa, Watson. Biennial, hoary-tomentose ; stems clustered, 

 mostly siiii))lo, 1^ high ; leaves lanceolate, tapering to the l)ase, mostly entire ; 

 style longer than tlie glohular 1 -4-see(le(l silicle; seeds wingless. — Bluffs of 

 the Cuniherland ]{ivcr, Tennessee. April. 



15. ALYSSUM, Tourn. 



Silicle Hat, 2 - 4-seeded. Filanieuts of leu toothed. Flowers (of ours) white. 



— Otherwise like the last. 



1. A. maritimum, L. (Sweet Alyssim.) Perennial, prostrate; 

 leaves lauceolale ; silicle 2-seeded. — North Carolina. Introduced. 



16. CAMELINA, Crantz. 



Silicle ovoid or pear-shaped, flattened parallel to the broad partition ; valves 

 1-iierved. Seeds numerous, oblong. Cotyledons incumbent. Style slender. 



— Flowers small, yellow. 



1. C. sativa, Crantz. Leaves alternate, sagittate ; silicle large. — Fields, 

 North Carolina, and northward. Introduced. (T)- 



17. SENEBIERA, Poir. 



Silicle didymous, compressed contrary to the narrow partition; the cells 

 globular, 1-seeded, crested or pitted, indehiscent, at maturity separating from 

 the partition. Cotyledons incumbent. — Annual or biennial diffuse strong- 

 scented herbs, with pinnately lobed or divided leaves, and minute white flow- 

 ers, in short racemes, opposite tiie leaves. Stamens 2, 4, or 6. 



1. S. pinnatifida, DC. Stem prostrate ; leaves deeply pinnatifid, with 

 the numerous lobes toothed on the upper edge ; silicle pitted, emarginate at 

 both ends. — Wa.ste places, Florida to North Carolina. March - May. — Ra- 

 cemes many-flowered. 



2. S. Coronopus, Poir. Stem jiro.strate ; leaves deeply pinnatifid, with 

 the lobes entire, toothed, or pinnatifid ; silicles not emarginate, the margins 

 crested. — Waste places. Introduced. March -April. 



18. LEPIDIUM, L. Peppergrass. 



Silicle rounded or obcordate, compressed contrary to the narrow partition ; 

 valves carinate; cells 1-seeded. Cotyledons accumbent and incumbent. 

 Petals sometimes wanting. Stamens 2, 4, or 6. — Leaves entire, toothed, 

 or pinnately divided. Flowers minute, in terminal racemes. 



1. L. Virginicum, L. Smooth; stem erect, much branched; leaves 

 lanceolate, sharply toothed, the lowest tapering and mostly pinnatifid toward 

 the base ; silicle orbicular, wingless ; cotyledons accumbent ; .stamens mostly 

 two. — Waste places, very common. March- June. (J) — Stem 1°- 2° high. 



19. CAPSELLA, Vent. Shepherd's Purse. 



Silicle triangular wedge-shaped, flattened contrary to the narrow partition, 

 many-seeded ; valves wingless. Cotyledons incumbent. — An annual herb, 



