. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 176 CRUCIFERAE. Vol. I. Arabidopsis Thaliana (L.) Britton. Mouse-ear or Thale-cress. Wall-cress. Fig. 2063. Arabis Thaliana L. Sp. PI. 665. I753- Sisymbrium Thalianum Gay, Ann. Sci. Nat. 7; 399- 1826. Stenophragma Thaliana Celak. OEster. Bot. Zeitsch. 27: I77. 1877. Annual, stem slender, erect, i'-i6' high, freely branching, more or less pubescent with sho
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 176 CRUCIFERAE. Vol. I. Arabidopsis Thaliana (L.) Britton. Mouse-ear or Thale-cress. Wall-cress. Fig. 2063. Arabis Thaliana L. Sp. PI. 665. I753- Sisymbrium Thalianum Gay, Ann. Sci. Nat. 7; 399- 1826. Stenophragma Thaliana Celak. OEster. Bot. Zeitsch. 27: I77. 1877. Annual, stem slender, erect, i'-i6' high, freely branching, more or less pubescent with short stiff hairs, especially below. Basal leaves 1-2' long, obtuse, oblanceolate or oblong, narrowed into a petiole, entire or slightly toothed; stem-leaves smaller, sessile, acute or acutish, often entire; pedicels very slender, spreading or ascending, 2"-4" long in fruit; flowers about i*" long; petals about twice the length of the sepals; pods narrowly linear, 4"-io" long, acute, often curved upward, glabrous. In sandy fields and rocky places, Massacusetts and southern Ontario to Minnesota, Georgia, Missouri, Arkansas and Utah. Very common eastward. Naturalized from Europe. Native also of northern Asia. Turkey-pod. April-May. 2. Arabidopsis novae-angliae (Rydb.) Britton. Low or Northern Rock-cress. Fig. 2064. Arabis pelraea Hook. Fl. Bor. Am. i : 42, in part. 1829. Not Lam. Sisymbrium humile Wats. & Coult. in A. Gray, Man. Ed. 6, 71. 1890. Not Meyer, 1831. Braya humilis Robinson, in Gray & Wats. Syn. Fk i': 141, in part. 1895. Pilosella novae-angliae Rydb. Torreya 7; 158. 1907. Perennial, erect, 4'-io' high, branching below, spar- ingly pubescent. Leaves spatulate, or oblanceolate, the lower obtuse, 1-2' long, narrowed into a petiole, sharply dentate or rarely entire, the upper smaller, narrower, often acute; flowers white or pink, li"-2" broad; pedi- cels ascending or erect, 2"-3" long in fruit; pods nearly terete, glabrous
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