CRUCIFER.E. (MUSTARD FAMILY.) 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 RUTABAGA 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. PENNYCRESS. 



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-shaped and clasping, and small 

 white or purplish flowers. (Ancient Greek name, from 6\dw, to crush, from 

 the flattened pod.) 



T. ARVENSE, L. (FIELD P. or MITHRIDATE MUSTARD.) A smooth an- 

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

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



20. LEPIDIUM, Tourn. PEPPERWORT. 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 AeTTiSfov, a little scale, alluding to the small flat pods.) Ours are 

 annuals or biennials, except the last. 



* Leaves all with a tapering base, the upper linear or lanceolate and entire, the 

 lower and often the middle ones incised or pinnati/ld ; pods orbicular or oval, 

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



1. L. Virginicum, 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 wing-margined at the top , petals usually minute or wanting ; 

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

 north and westward. 



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

 marginless; petals always wanting. Roadsides, near Boston, Philadelphia, 

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



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



L. CAMPESTRE, Br. Minutely soft downy , leaves arrow-shaped, somewhat 

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

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



L. DR!BA, L. Perennial, obscurely hoary; leaves oval or oblong, the 

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

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

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



