CRUCIFER^. (mISTARD FAMILY.) 73 



and more pun.2:pnt than iu the last; lower leaves with a large terminal lobe 

 and a few small lateral ones. — Fields and waste places. (Adv. from Ku.) 

 _ B. CAMi'ESTKis, L., in the form of the Hi T.ui.vGA and the Tuknii', some- 

 times persists a year or two iu neglected grounds. 



18. CAP SELLA, Medic. Shepherd's Purse. 



Pod obcordate-triangular, flattened contrary to the narrcjw ])artition ; the 

 valves boat-shaped, wingless. Seeds numerous. Cotyledons mcurabent. — 

 Annuals; flowers small, white. (Name a diminutive of capsa, a box.) 



C Bursa-past6ris, Moench. Root-leaves clustered, pinnatifid ur tootiied; 

 stem-leaves arrow-shaped, sessile. — Waste places ; the commonest of weeds. 

 April- Sept. (Nat. from Eu.) 



19. THLASPI, Tourn. Pexnycress. 



Pod orbicular, obovate, or obcordate, flattened contrary to the narrow par- 

 tition, the midrib or keel of the boat-sliaped valves extended into a wing. 

 Seeds ;2 - 8 in each cell. Cotyledtnis accumbent. Petals equal. — Low plants, 

 with root-leaves undivided, stem-leaves arrow-shaped and clasping, and small 

 white or purplish flowers. (Ancient Greek name, from dKaa,, to a-us/i, from 

 the flattened pod.) 



T. ARVENSE, L. (Field P. or Mitiiridate Mustard.) A smooth an- 

 nual, with broadly winged pod V in diameter, several seeded, deeply not^-hed 

 at top; style minute. — Waste places; rarely naturalized. (Nat. from Eu.) 



20. LEPIDIUM, Tourn. Pepperw^ort. Peppergrass. 



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

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

 incumbent, or in n. 1 accumbent! Flowers small, white or greenish. (Name 

 from \€Tridiov, a little scale, alluding to the small flat pods.) — Ours are 

 annuals or biennials, except the last. 



« Leaves all with a taperinri base, the upper linear or lanceolate and entire, the 

 loicer and often the middle ones incised or pinnatijid ; pods orbicular or oval, 

 with a small notch at the top ; the style minute or none ; stamens ordy 2. 



1. L. Virginieum, L. (Wild Peppergrass.) Cotyledons accumbent 

 and seed minutely margined; pod marginless or obscurely margined at the 

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

 common roadside weed, which has immigrated from farther south. 



2. L. intermedium. Gray. Cotyledons incumbent as in the following ; 

 pod minutely iciny-margined at the top ; petals u.sually minute or wanting; 

 otherwise nearly as in u. 1 . — Dry places, from western N. Y. and N. 111., 

 north and westward. 



L. ruderXle, L. More diffuse, the smaller and oval pods and the seeds 

 marginless ; petals ahrays icantiug. — Roadsides, near Boston, Philadelphia, 

 etc.; not common. (Adv. from Eu.) 



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



L. campestre, Br. Minutely .so/? downy; loaves arrow-shaped, somewhat 

 toothed; pods ovate, iringed, rough, the style longer than the narrow notch. — 

 Old fields, Mass. and N. Y. to Va. ; rare. (Nat. from Eu.) 



L. DrXba, L. Perennial, obscurely hoary; leaves oval or oblong, the 

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

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

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



