ORDER XIII. CRUCIFEK.E. 225 



ed, latoral ones lobed ; radical leaves sometimes wantin,^. Floioers in 

 terminal racemes. Sepals lanceolate, acute. Petals much larijer than 

 the sepals. Taste of the root pungent, like mustard. — Pale purple. %. 

 May to June. Mountains and Middle Geo, 4 — 12 inches. 



2. D. diphyl'la, (Mich.) Rhizoma toothed, creeping. Leaver eauline, 

 1 — 2, ternately divided ; leaflets ovate, oblong, toothed, and incised ; 

 petioles about 1 inch long. Root very pungent. — Pale purple. %. 

 May to June. Mountains. 



3. D. multif'ida, (Muhl.) Rhizoma tuberous. Leaves 2, opposite, 

 2 — 3 inches long, variously divided ; segments and lobes linear. Flou> 

 crs in a terminal raceme. Sepals lanceolate. Petals much longer than 

 the sepals. — White. 2^. N. C. and Ala. 4 — 6 inches. 



Genus V— LEAVENWOR^THIA. Tor. 14—2. 

 (la honor of Dr. Leavenworth.) 



Cali/x somewhat erect, equal at the base. Petals equal, 

 cuneate, truncate, emarginate. Filaments distinct, toothless. 

 Silique sessile, oblong-linear, compressed, somewhat inflated, 

 and contracted between the seeds. Scedsm a single series, flat- 

 tened, with a broad winged margin. Annual herbaceous plants. 

 Leaves lyrately-pinnatifid. Flowers in loose racemes, or solitary 

 on long sub-radical peduncles. 



1. L. au'rea, (Torrey.) Stem at first short and simple, but at length 

 branching from the base ; branches ascending. Leaves mostly radical, 

 pinnatifid, somewhat fleshy ; segments 2 — 4 pairs, roundish oblong, ob- 

 tusely toothed. Racemes 4 — lO-flowered. Sepals loose, tinged with 

 purple. Petals golden yellow, tapering into a long cuneate base. Si- 

 lique rather more than an inch long.- Seeds 4 — 5 in a cell. — Alabama. 

 2 — 6 inches. 



Genus VI.— SISYM'BRIUM. L. 14—2. 

 (The Greek name of the plant) 



Silique terete, or slightly angled, with a short beak. Stigma 

 capitate. Sepals equal at the base, expanding. Petals ex- 

 panding. Seeds ovate or oblong. 



1. S. c-\NEs'cENs, (Nutt.) Root annual. Stem erect, branching. 

 Leaves 2 — 3 inches long, hoary, doiibly-pinnatifid ; segments lioary, 

 dentate, obtuse. Flowers in terminal racemes. Sepals oval, pubescent. 

 Petals obovate, equaling the calyx, expanding. Silique somewliat cla- 

 vate, half as long as the pedicels, angled. Seeds obovate, many in each 

 cell. — Yellowish. 0. March and April. Common. 1 — 2 ft. 



2. S. officina'le, (Scop.) Stem hairy. Leaves runcinate, hairy. 

 Flowers in elongated racemes, small, pedicels very short, appressed to 

 the axis after flowering. Petals cuneate, larger than the calyx. Si- 

 lique sub-ovate, tapering into a short style. — Yellow. 0. May and 

 Aug. Waste places. 1 — 3 ft. Hedge Mustard. 



The latter plant possesses somewhat the pungency of mustard, and has been recom- 

 mended in the treatment of chronic coughs, hoarseness, and ulceration of the montb. 

 Tlie Juice with sugar, or the seeds may be taken. 



10* 



