LEPIDIUM. XIII. CRUCIFERjE. 161 



at margin. Flowers small, in terminal racemes. Siliclos large, flat, with 

 dilated wings. The plant has a disagreeable flavor of garlic. June. 



2. T. ALLIACEUM. 



Lvs. oblong, obtuse, somewhat dentate, upper ones sagittate- amplexicaul, 

 _with acute auricles; silicles ovate- ventricose ; stig. subsessile. In cultivated 

 "fields, Western States, not common. -Stems 6 10' high. Lower leaves petio- 



late. Flowers smaller than, in T. arvense, in terminal racemes. This also savors 



of garlic. May Jl. 



3. T. TUBEROSUM. Nutt. 



Rt. tuberiferous and fibrous ; st. pubescent, simple, short ; Ivs. rhomboid- 

 ovate, obscurely dentate, smooth and sessile, radical ones petiolate ; silicle sub- 

 orbicular, If Penn. Stem not more than 4 5' high. Flowers rather large, 

 rose-colored. Apr. May. 



2. CAPSELLA. Yent. 

 Diminutive from capsa, a chest or box ; alluding to the fruit. 



Calyx equal at base ; silicles triangular-cuneiform, obcordate, 

 compressed laterally; valves carin ate, not winged on the back; 

 septum subliuear ; style short; seeds 00; oblong, small, 0||. 

 Fls. white. A troublesome weed. 



C. BURSA-PASTORIS. Msench. (Thlaspi Bursa-pastoris. Linn) SkepTierd's purse. 



Found everywhere, in fields, pastures, and roadsides. Stem 6 8 12' high, 

 nearly smooth in the upper part, hirsute below, striate, branching. Root-leaves 

 rosulate, 2 5 8' long, as wide, cut-lobed, on margined petioles ; segments 

 about 13. These lelaves are sometimes wanting, (when the weed is crowded,) or 

 only dentate. Stem-leaves much smaller, very narrow, with two small, acute 

 auricles at base, half clasping the stem. Flowers small, in racemes, which are 

 finally 3 12' long. Silicle smooth, triangular, emarginate at the end, and tipped 

 with the style. April Sept. 



3. LEPIDIUM. R. Br. 



Gr. Aen-i?, a scale ; from the resemblance of the silicle. 



Sepals ovate ; petals ovate, entire ; silicles oval-orbicular, emar- 

 ginate ; septum very narrow, crossing the greater diameter; valves 

 connate, dehiscent ; cells 1-seeded, 0|| or 0=. Fls. white. 



1. L. VIRGINICUM. Wild Pepper-grass. 



Lvs. linear-lanceolate, incisely serrate, smooth ; st. paniculately branched 

 above ; sta. 2 4 ; silicles orbicular, emarginate ; seeds 0==. In dry fields 

 and road-sides, U. S. Stem rigid, round, smooth, If high. Leaves 1 1' by 

 1 3", acute, tapering at base into a petiole, upper ones sessile, lower pinnatifidly 

 cut. Flowers and silicles very numerous, in a panicle of racemes. Fls. very 

 small, mostly diandrous; silicles lens-.shaped, 1" diarn., with a notch at the end. 

 Ta&te pungent, like that of the garden pepper-grass. Ja Oct. 



2. L. CAMPESTRE, R. Br. (Thlaspi campestris. Linn.) Yellow Seed. 

 Cauline Ivs. sagittate, denticulate ; silicles ovate, winged, emarginate, scaly, 



punctate. In waste places and dry fields, especially among flax. Stem 

 strictly erect, round, minutely downy, 6 10' high, branching. Leaves 1' long, 

 as wide, acute, with 2 lobes at base, upper one clasping the stem, all minutely 

 velvety. Flowers small. Silicles 1J" long, numerous, in long racemes. Jn. Jl. 



3. L. RUDERALE. 



Lvs. cauline, incised, those of the branches linear, entire ; fls. apetalous, 

 and with but 2 stamens ; silicles broadly oval or suborbicular, emarginate, wing- 

 less ; cotyl. |. Dry fields, Mich., la., Mo. Stem 10 15' high. Racemes 

 many. Flowers remarkable for wanting the petals, which are always present in 

 our other species. 



4. L. SATivuif. Peppergrass. Lvs. variously divided and cut ; branches with- 

 out spines; silicles orbicular, winged. Native of the East. Stems 1 31 



