ORDER XIII. CRUCIFER.E. 225 



ed, lateral ones lobed ; radical leaves sometimes wanting. Flowers in 

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

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

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



2. I), dipiiyl'la, (Mich.) Rhizoma toothed, creeping. Leaven cauline, 

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

 petioles about 1 inch long. Root very pungent. — Palo purple. If. 

 May to June. Mountains. 



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

 2 — 8 inches long, variously divided; segments and lobes linear. Flow- 

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

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



Genus V.— LEAVEXWOR'THIA. Tor. 14—2. 

 (In honor of Dr. Leavenworth.) 



Calyx somewhat erect, equal at the base. Petals equal, 

 cuneate, truncate, emarginate. Filaments distinct, toothless. 

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

 and contracted between the seeds. Seeds m 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 — 10-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. 



Genxs VI.— SISYMBRIUM. 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. canes'cexs, (Xutt.) Root annual. Stem erect, branching. 

 Leave* 2 — 3 inches long, hoary, doubly-pinnatifid ; segments hoary, 

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

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

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

 celL — Yellowish. Q. March and April. Common. 1 — 2 ft. 



2. 8. officinale, (Scop.) Stem hairy. Leaves runcinate, hairy. 

 Flower* in elongated racemes, small, pedicels very short, appressed to 

 the axis after flowering. Petals cuneate, larger than the calyx 8i- 



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

 Aug. Wast..- | daces. 1 — 3 ft. Hedge Mustard. 



- somewhat the pungency of mustard, and has been recom- 

 . merit of chronic coughs, hoarseness, and ulceration of the mouth. 

 The juice with twjar, or the seeds may be taken. 



to* 



