168 XU. CRUCIFERAE. ; SisYMBRIUM. 
valves, opening elastically ; placentee not winged; seeds im a single 
row, ovate, not bordered ; funiculus slender, O=—Rhizoma U. Lvs. 
divided, often but 2 or 3. F'ls. white or purplish. 
1. D. pippytua. Pepper Root. 
St. 2-leaved; /fts. ternate, subovate, unequally and incisely dentate; 
rhiz. dentate.—In woods and wet meadows, Can. to Car. and to the Miss. Stem 
about 1f high, round, smooth, with 2, nearly opposite, ternate leaves above the 
middle. Leaflets on very short stalks, the lateral ones oblique, all with rounded, 
mucronate, unequal teeth. Flowers racemed, large, white; the petals much 
larger than the calyx. The rootstock is long and large in proportion tc the 
plant, beset with teeth, with a pungent, aromatic taste. May. 
2. D. vaciniita. Muhl. (D. concatenata. Michz,) 
Rhiz. moniliform; cauline lvs. 3, 3-parted, the divisions lanceolate or 
linear-oblong, incisely toothed or pinnatifid, lateral ones lobed—In woods; Can. 
and U.S. The rootstock consists of several tubers of a pungent taste. Stem 
1f high, smooth, simple. Leaves usually in a whorl about half-way up, the 
segments with very irregular, mucronate teeth, rarely subentire, lateral ones 
cut nearly to the base, rendering the leaf almost quinate. Root-leaves some- 
times 0. Flowers racemed, purplish. Apr. May. 
3. D. maxima. Nutt. 
St. tall; dws. alternate, 5—7, remote, the margin a little roughened ; /fts. 
somewhat oval, incisely and acutely dentate, lateral ones lobed—Western 
N. Y. and Penn. Tubers of the rhizoma concatenate. Stem often nearly 2f 
high. Flowers pale purple. 
4. D. nETEROPHYLLA. Nutt. 
Rhiz. moniliform, with oblong tubers; radical ivs. on long petioles, 
deeply and obtusely lobed, lobes crenate-dentate with abruptly mucronate teeth, 
cauline lvs. 2, rarely 3, alternate, petiolate, ternately divided, segments linear- 
lanceolate, entire or rarely toothed, rough-edged.—Woods, Penn. to Ky. Stem 
8—12’ high. Cauline leaflets 1—2’ long, 2—3” wide. Corymb with about 9 
pale purple flowers. Jn. 
18. HESPERIS. 
Gr. éorepts, evening; when the flower is most fragrant. 
Calyx closed, furrowed at base, shorter than the claws of the petals ; 
petals bent obliquely, linear or obovate; silique 4-sided, 2-edged or 
subterete ; seeds not margined ; stigmas forked, with the apices con- 
verging. 
1. H. matroniuis. Rocket. 
St. simple, erect; lvs. lanceolate, ovate, denticulate; pet. emarginate, 
mucronate ; pedicels as long as the calyx.—A fine garden perennial, said to be 
found native about Lake Huron. Stem 3—4f high. Flowers purple, often 
double, and white in ~. hortensis. F 
»/2. H. aprica. Siberian Rocket—St. erect, simple, pubescent; lvs. oblong, 
obtuse, entire, ciliate-hispid; pedicels as long as the calyx.—2| From Siberia. 
Stem a foot high. Flowers purple. May. Jn. tf 
19. SISYMBRIUM. Allioni. 
Calyx mostly spreading, equal at base ; petals unguiculate, entire ; 
silique subterete ; valves concave; style very short; seeds in a sin- 
gle series, ovoid; cotyledons 0|], sometimes oblique. 
1. 8. orFricinate. Scop. (Erysimum. Linn.) Hedge Mustard. 
Lvs. runcinate ; rac. slender, virgate ; siligues subulate, erect, closely ap- 
pressed to the rachis.—@ A common and troublesome weed, in fields, road- 
sides, rubbish, &c., Can. and U.S. Stem 1—3f high, round, more or less hairy, 
with spreading branches. Lower leaves 3—8’ by 1—3’, the lower segments 
placed at right angles to the midvein, or pointing backwards, the terminal seg- 
