LEPIDIUM. XIII. CRUCIFER^E. 161 



at margin. Flowers small, in terminal racemes. Silicles 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. Tj. Penn. Stem not more than 4 5' high. Flowers rather large, 

 rose-colored. Apr. May. 



2. CAPSELLA. Vent. 



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



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

 pressed laterally : valves carinate, not winged on the back ; septum 

 sublinear; style short; seeds 00; oblong, small, 0||. (D Fls. white, 

 A. troublesome weed. 



C. BURSA-PASTORIS. Maench. (Thlaspi Bursa-pastoris. Linn.") Shepherd'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 58' long, j as wide, cut-lobed, on margined petioles ; segments 

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

 only demate. 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. Ae-Trif, a scale; from the resemblance of the silicle. 



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

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

 carinate, 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 2' 

 by 1 3" , acute, tapering at base into a petiole, upper ones sessile, lower pinna- 

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

 very small, mostly diandrous ; silicjes lens-shaped, 1" diam., with a notch at the 

 end. Taste pungent, like that of the garden pepper-grass. Jn. Oct. 



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



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

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

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

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

 velvety. Flowers small. Silicles 1|" 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. II . 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. SATIVUM. Peppergrass. Lvs. variously divided and cut ; branches with- 

 out spines ; silicles orbicular, winged. (D Native of the East. Stems 1 3f 



