155 XIII. CRUCIFERiE. Asabh. 



1. T. GLABRA. Smooth Tmver Mustard. 



St. erect- radical Irs. petiolate, dentate, with ramose hairs, canli-m ones 

 broad-lanceolate, sagittate, hall-clasping, glaucous, smooth; s'diqxies erect.— 

 Shores of Lake Superior, W. to the Rocky Mts. Naturalized about New 

 E.a.ven. Eaton. Stem round, simple, Uf high. Leaves 1—2' long. Siliques 

 2—3' long, very narrow. Flowers pale sulphur-yellow. May. 



pi. T. & G. Lvs. all linear-lanceolate and glabrous, radical 07ies remotely 

 repand-denticulate, caulinc entire.— Watertovvn, N. Y., on rocks. Torrey tf- Graij. 



2. T. BRACHYCARPA. Torr. & Gray. 



Glabrous and glaucous ; radical Irs. spatulate, dentate, cauhne ones hnear- 

 lanceolale, sagittate and subamplexicaul ; siliques short, linear-oblong ; pedicels 

 pendulous' in flower, spreading in fruit.— d) Lake shores, Mich. Stem 1— 2£ 

 nigh, often purplish, as well as the foliage. Flowers rather large, pale purple. 

 Siliques 1' long, spreading. 



15. arAbis. 



Said to derive its name from Arabia, its native country. 



Sepals erect ; petals uuguiculate, entire ; silique linear, compressed ; 

 valves 1 -veined in the middle; seeds in a single row in each cell. — 

 Fls. white. 



1. A. Canadensis. (A. falcata. Michx.) Sickle Pod. 



CauUne lvs. sessile, oblong-lanceolate, narrow at base, pubescent; pedi- 

 cels pubescent, reflexed in the fruit ; silique subfalcate, veined, pendulous ; sds. 

 winged.— t; 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, i 

 as wide ; the lowest early marescent, middle and upper ones sessile or clasping, 

 with narrow bases, remotely denticvilate. Flowers small, white. Pods slen- 

 der, flattened, nearly 3' long. Jn. 



2. A. LYRATA. (Sisymbrium arabidoides. Darl.) 



St. and upper lvs. smooth and glaucous ; radical lvs. lyrately pinnatifid, 

 often pilose ; st. branched at base ; pedicels spreading ; siliques erect.— (D On 

 rocky hills. Can. to Va. Stems often many, united at base, 6—12' .^^igh. Root- 

 leaves numerous, rosulate, 1—3' long, i as wide, petiolate, lower stem-leaves 

 pinnatifid or sinuate-dentate, upper ones sublinear and subentire. Flowers 

 middle size. Siliques when mature li— 2' long, less than 1" wide. Apr. May. 



3. A. L.ffi:viGATA. DC. (Turritis Icevigata. Miihl.) 



Smooth and glaucous ; radical lvs. obovate and oblong, tapering to a pe- 

 tiole dentate, stem lvs. linear-lanceolate, amplexicaul, obtuse, upper ones enUre; 

 pedicels about as long as the calvx, erect; siliques very long, linear, at length 

 spreading and pendulous ; sds. winged.— '4 In rocky woods and low groimds, 

 Can. to Ark. Stem 1 — 2f high, round, smooth, simple or branched above. 

 Root-leaves often purplish, f— li' long, § as wide, with acute teeth. Stem- 



jgaves 2 5' long, | as wide, upper ones entire. Flowers in long racemes. 



Siliques 2—3' long, scarcely 1" wide. May. 



4. A. HiRsi-TA. Scop. (Turritis. Lin7i.)_ 



Erect branching; lvs. mostly dentate, hirsute, radical ones oblong-ovate 

 tapering to a petiole, cauline ones oval or lanceolate, sagittate; siliques atraighx,, 



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. S"iliques straight, 1 — 2' long. Jn. 



5. A. HETEROPHYLLA. , Nutt. 



Nearly smootli ; radical lis. spatulate, toothed, upper ones linear, sessile, 

 entire; silique long and spreading ; ;;e/. linear-oblong, exceeding the calyx.— 

 Near Paris, Me., and the White Mts., N. H. Radical leaves somewhat pilose 

 with simple hairs, upper ones linear, about 2' long, and 1 — 2" wide. Siliques 

 about 3' long. NuttaM. 



