166 XI. CRUCIFERZ. ° ARaBIS. 
1. T. cuasra. Smooth Tower Mustard. 
St. erect; radical lvs. petiolate, dentate, with ramose hairs, cauline ones 
proad-lanceolate, sagittate, half-clasping, glaucous, smooth; siligues erect.— 
Shores of Lake Superior, W. to the Rocky Mts. Naturalized about New 
Haven. Eaton. Stem round, simple, 1}fhigh. Leaves 1—2/ long. Siliques 
2—3/ long, very narrow. Flowers pale sulphur-yellow. May. 
B2 T.&G. Lws. all linear-lanceolate and glabrous, radical ones remotely 
repand-denticulate, cwuline entire.—W atertown, N. Y.,onrocks. Torrey g Gray. 
2. T. pracuycarpa. Torr. & Gray. 
Glabrous and glaucous; radical lvs. spatulate, dentate, cauline ones linear- 
lanceolate, sagittate and subamplexicaul ; s¢digues short, linear-oblong ; pedicels 
endulous in flower, spreading in fruit—@) Lake shores, Mich. Stem 1—2f 
fieh, often purplish, as well as the foliage. Flowers rather large, pale purple. 
Siliques 1/ long, spreading. ’ 
15. ARABIS. . 
Said to derive its name from Aravia, its native country. 
Sepals erect ; petals unguiculate, entire ; silique linear, compressed ; 
valves l-veined in the middle; seeds in a single row in each cell_— 
Fils. white. 
1. A. Canapensis. (A. falcata. Michx.) Sickle Pod. 
Cauline lwvs. sessile, oblong-lanceolate, narrow at base, pubescent; pedi- 
cels pubescent, reflexed in the fruit; silique subfalcate, veined, pendulous; sds. 
winged—7 On rocky hills, Can. to Ga. W. to Ark. A plant remarkable for 
its long, drooping pods, which resemble a sickle blade, or rather a curved 
sword blade. Stem 2—3f high, slender, round, smooth. Leaves 1—3/ long, } 
as wide; the lowest early marescent, middle and upper ones sessile or clasping, 
with narrow bases, remotely denticulate. Flowers small, white. Pods slen- 
der, flattened, hearly 3’ long. Jn. 
2. A. uyRita. (Sisymbrium arabidoides. Darl. 
St. and upper lvs. smooth and glaucous; radical ls. lyrately pinnatifid, 
often pilose; sé. branched at base; pedicels spreading ; siliques Cee On 
rocky hills, Can. to Va. Stems often many, united at base, 6—12’ high. Root- 
leaves numerous, rosulate, 1—3’ long, $ as wide, petiolate, lower stem-leaves 
pinnatifid or sinuate-dentate, upper ones sublinear and subentire. Flowers 
middle size. Siliques when mature 14—2’ long, less than 1” wide. Apr. May. 
3. A. pavicita. DC. (Turritis levigata. Muhl. 
Smooth and glaucous; radical lvs. obovate and oblong, tapering to a pe- 
tiole, dentate, stem lvs. linear-lanceolate, amplexicaul, obtuse, upper ones entire ; 
pedicels about as long as the calyx, erect; stliques very long, linear, at length 
spreading and pendulous; sds. winged.—2 In rocky woods and low grounds, 
Can. to Ark. Stem 1—2f high, round, smooth, simple or branched above. 
Root-leaves often purplish, $—1}/ long, } as wide, with acute teeth. Stem- 
leaves 2—5’ long, 1 as wide, upper ones entire. Flowers in long racemes. 
Siliques 2—3’ long, scarcely 1’ wide. May. 
4, A. nirstta. Scop. (Turritis. Linn.) 
Erect, branching; lvs. mostly dentate, hirsute, radical ones oblong-ovate 
tapering to a petiole, cawline ones oval or lanceolate, sagittate ; siliques straight, 
erect.—( Found in low, rocky grounds, Can. to Va. W. to Oregon. Stems 2 
or more from the same root, round, hairy at base, near a foot high, dividing 
into very slender and parallel branches. Leaves scarcely dentate, sessile, with 
heart-shaped or arrow-shaped bases, upper ones acute. Flowers greenish- 
white. Siliques straight, 1—2’ long. Jn. 
5. A. HETEROPHYLLA. Nutt. 
Nearly smooth; radical ls. spatulate, toothed, wpper ones linear, sessile, 
entire; siligue long and spreading; pet. linear-oblong, exceeding the calyx.— 
Near Paris, Me., and the White Mts.,N. H. Radical leaves somewhat ilose 
with simple hairs, upper ones linear, about 2’ long, and 1—2” wide. Siligues 
about 3’ long. Nuttall. 
