v ^ New UtnerQ and Species of 



somewhat bent on the cotyledons: the radicle very short, co' 

 rjical, pointing obliquely upwards towards the bilum. CO- 

 TYLEDONS Orbicular. DlSSEPIMBNT 1-nerved, minutely reticu- 



lated; the areolae transversely linear-oblong. Herbaceous, 



annual ; leaves lyralely pinnatifid ; flowers on long subradical 

 peduncles, or in loose racemes, yellow. — Nat. Ord. Cruci- 



r 1 1 1 , 



Li;.\\ r.\\\'"i;Tii ia aikea, Plate 5. 



Style distinct ; embryo nearly straight. 



R rf straight, 6im pic, descending. PI mil 2 — inclics high. Stem nt fir-» 

 short and simple, but at Length branching from the base; the branches 

 assurgent, Bmooth. Leaves mostly radical, about 2 inches long, (including 

 the petioles; pinnatifid : rathi r thick ; segments "1 — 1 parts, roundish-ob- 

 long, with a few obtuse teem : terminal one much the largest, somewhat 

 orbicular. Racemes 4 — 10-flowered. Flowers in the young plain, so- 

 litary, "ii long erect naked peduncles; in advanced specimens racemose 

 on the short assurgent branches. Pedicels without bracts, an inch or 

 more in Length, filiform, spreading and curved upward. Calyx imbri- 

 cate in aestivation*, rather Loose; sepals oblong, obtuse, tinged with 

 purple. Petals yellow, tapering to a Long eune;itc base; the limb 

 truncate and somewhat emarginate. Stamens distinct; filaments 

 slender; anthers oblong. Ovarium sessile, oblong ; style short but dis- 

 tinct, straight; stigma minute, somewhat 2-toothed. Silique rather 

 more than an inch long, and nearly 2 lines in breadth, slightly torulose, 

 rather convex, obscurely nerved. Dissepiment very thin and transpa- 

 , separable into two lamina, with a waved central line, or raphe, 

 running (rom the summit to the base; under a strong lens exhibiting 

 sjiastarnosing veins or tubes, the interstices of which are more or Less 

 linear, and transvi rsi . oral right angles to the longitudinal nerve.f Seeds 



a ol the sepal* ia very rare in Orucifera. It was tir^t 

 ■ ■ i . I: Brown {Obs. on Plants collected by Oudney, c5tc p. 7.) in Navig- 

 niaand EUeotia, and Meyer has since detected it in Corin| H it. (/'/. of < 

 19 1.) 

 • K Brown, \\li<> tirst introduced the structure < > i the dissepiment into cha- 

 ■ Crucifere, saya, he expects with much confidence that it 

 will j«r«-»« nt great uniformity in strict]* natural genera. Restates, that "in 

 man) b <■' rtairuy not in all, be found ■ rest mblance in tbia respect in 



more c xtcn»ive gr. [ havi examined many Cru ohiefly North Ame 



