CRUCIFER^. (mustard FAl^ILY.) 73 



and more pungent than in the last; lower leaves with a large terminal lobe 

 and a few small lateral ones. — fields and waste places. (Adv. from Eu.) 



B. CAMPESTRis, L., in the form of the Ki tabaga and the Turnip, some- 

 times persists a year or two in neglected grounds. 



18. CAP SELL A, Medic. Shepherd's Purse. 



Pod obcordate-triangular, flattened contrary to the narrow partition ; the 

 valves boat-shaped, wingless. Seeds numerous. Cotyledons incumbent. - - 

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



C. Bursa-past6ris, Moench. Root-leaves clustered, pinnatifid or toothed; 

 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-shaped valves extended into a wing. 

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

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

 white or purplish flowers. (Ancient Greek name, from 0Ada>, to crush, from 

 the flattened pod.) 



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

 nual, with broadly winged pod .3' in diameter, several-seeded, deeply notched 

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

 annuals or biennials, except the last. 



« Leaves all with a tapering base, the tipper linear or lanceolate and entire, the 

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

 with a small notch at the top ; the stijle minute or none ; stamens only 2. 



1. L. Virginicum, L. (Wild Peppergrass.) Cotijledons accumbent 

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

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

 common roadside weed, which has immigrated from farther south. 



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



pod minutely icing-margined at the fop ,• petals usually minute or wanting; 



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



north and westward. 



L. ruderA-LE, L. More diffuse, the smaller and oval pods and the seeds 

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

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



* * Stem-leaves icith a sagittate partly clasping base, rather croivded. 



L. CAMPESTRE,Br. Miuutelv so/i' downy.- leaves arrow-shaped, somewhat 

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

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



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

 upper with broad clasping auricles ; flowers corymbose ; ])ods heart-shaped, 

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

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



