74 CRucii'ER^.. (mcstakd family.) 



1. T. ARVEXSE, L. (Field P. or Mitiiridate Mustard.) A smooth 

 annual, with broadly winjied jiod y in diameter, several-seeded, deeply notched 

 at top; style miiiute. — Waste plaees, sliore of Lake Huron and in Lower 

 Canada; also Virginia. (Nat. from Eu.) 



17. LEPIDIUM, L. Peppekwout. Peppekgrass. 



Pouch roundish, much flattened contrary to the narrow partition ; the valves 

 boat-siiaped and keeled. Seeds solitary in each cell, pendulous. Cotyledons 

 incumb^'nt, or in No. 1 accumhent ! Flowers small, white or greenish. (Namo 

 from Xfnidiov, a little scale, alluding to the small flat pods.) — Ours arc annuals 

 or biennials, except the last. 



* Leaves all with a taperitiij base ; the upper linear or lanceolate and entire, the foiv/r 

 and often the middle oms incised or pinnatijid : pods orbictilar or oval, with a 

 small notch at the top: the stjle minute or none: stamens otilij 2. 



1. L. Virginicum, L. (Wild Peppergrass.) Cotj/ledons accumbent 

 and seed minutely margined ; pod mare/inless or obscurely margined at the top; 

 petals present, except in some of the later flowers. — June -Sept. A common 

 roadside weeil, which has immigrated from farther South. 



2. L. intermddium, Gray. Cotijledons incumbent as in the following ; 

 pod minuttlj/ wing-margined at the top; petals sometimes conspicuous, rarely 

 wanting; otherwise nearly as in No. 1. — Dry places, from Northern Michigan 

 and Illinois northward and westward. 



3. L. RLDERALE, L. Morc difFusc, the smaller and oval pods and- the seeds 

 marginless ; petals ahcays wanting. — Koadsides, near Boston, Philadelphia, &c. ; 

 not common. (Adv. from Eu.) 



* * Stem-leaves with a sagittate partly clasping base, rather crowded. 



4. L. CAMPESTRE, L. Miuutcly so/J f/ojt'Hy ; leaves arrow-shaped, somewhat 

 toothed; pods oiute, winged, rough, the style longer than the narrow nptch. — 

 Old fields, Mass. and New York to Virginia: rare (Nat. from Eu.) 



5. L. Du.Vba, L. Perennial, oibscurely hoaiy; leaves oval or oblong, the 

 upper with broad clasping auricles ; flowers corymbose ; pods heart-shaped, 

 wingless, tliickLsh, entire, tipped with a conspicuous style. — Astoria, near New 

 York, D. C. Eaton. (Adv. from Eu.) 



18. SENEBIERA, DC. W^vrt-Cress. Swine-Cress. 



Pouch flattened contrary to the narrow partition ; the two cells indchiscent, 

 but falling away at maturity from the partition as closed nutlets, strongly 

 wrinkled or tuljerculate, 1-secdcd. Cotyledons narrow and incumbently folded 

 transversely. Low and diff"usc or prostrate annuals or biennials, with minute 

 whiti;-h flowers. Stamens often only 2. (Dedicated to J. Sencbicr, a distin- 

 guished vegetable physiologist. ) 



1. S. didyma, Pcrs. Leaves 1 -2-pinnately parted; pods notched at the 

 apex, rough-wrin/cled. (S. pinnatifida, DC. Lepidium didymum, Z.) — Waste 

 jilaces, at ports, Philadelphia to Virginia, &e. : an immigrant from farther 

 South. 



