CRUCIFERAE. [Von. II. 
4. Arabis dentata T.& G. Toothed 
Rock-cress. (Fig. 1774.) 
Sisymbrium dentatum ‘Torr, Transyl. Journ. 
Med. 10: 338. Name only. 1837. 
Arabis dentata T. & G. Fl. N. A. 1:80. 1838. 
Slender, erect or ascending, 1°-2° high, 
sparingly branching, finely rough-pubescent. 
Basal leaves on margined petioles, obovate, 
dentate, 2’-4/ long, obtuse; stem-leaves sessile» 
clasping by an auricled base, dentate, oblong 
or oblanceolate; pedicels 1/’-2’’ long, spread- 
ing; flowers greenish-white, 1//-2’ broad, the 
petals hardly exceeding the calyx; pods nar- 
rowly linear, 10’’-15’’ long, spreading; style 
almost none; seeds in 1 rowineach cell, oblong, 
marginless. 
Western New York to Minnesota. south to Ten- 
nessee and Missouri. April-June. 
US LS, 
5. Arabis alpina L. Alpine Rock- 
cress. (Fig. 1775.) 
Arabis alpina I,. Sp. Pl. 664. 1753. 
Erect or ascending, 4/-12’ high, densely 
and finely pubescent. Basal leaves 1/—2/ 
long, obovate or spatulate, obtuse, dentate, 
on margined petioles; stem-leaves ovate, ses- 
sile, clasping by an auricled base, dentate; 
flowers white, 2’’-3/’ broad; petals much ex- 
ceeding the calyx; pedicels slender, spread- 
ing or ascending, 4’’ long in fruit; pods 1/— 
1%4/ long, curved upward, narrowly linear, 1// 
broad; seeds in 1 row in each cell, oblong, 
narrowly winged; style scarcely any. 
Gaspé, Quebec, to Labrador, arctic America 
and Alaska. Also in northern and central 
Europe and in northern Asia. Summer. 
6. Arabis patens Sulliv. Spreading 
Rock-cress. (Fig. 1776.) 
Arabis patens Sulliv. Am. Journ. Sci. 42: 49. 
1842. 
Erect, 1°-2° high, mostly pubescent with 
spreading hairs, at least below. Basal leaves 
dentate, 1/-3’ long, on margined petioles; 
stem-leaves 1/-2’ long, ovate or oblong, acute 
or acutish, sessile, dentate or nearly entire, 
partly clasping bya cordate base; pedicels as- 
cending, 6’’-8’” long in fruit, slender; flow- 
ers white, 4’ broad; pods 1/-114’ long, 4’ 
broad, narrowly ascending, not appressed; 
seeds in I row in each cell, oblong, narrowly 
winged; style 1’’ long. 
Eastern Pennsylvania to Minnesota, south to 
Alabama and Missouri. Summer. 
