. Flowers of the field. Botany. Arabis Thaliana (Thale Rock Cress) THALAMIFLOR7E 4. A. alpina (Alpine Rock Cr<tss).—Flowers larger than in tlie last; stem-haves toothed, downy. A rare species only found in ilie Isle of Skye.—Perennial. 5. .4. ciliata (Fringed Rock Cress).—Stem about 6 inches high, smooth ; leaves smooth on both sides, fringed with hairs at the edges ; flowers white. Con- fined to a few localities in South Wales and the west of Ireland.—Perennial. 6. A. thaliana (Thale Ro"ck Cress).—Stem 6-12 inches high ; stem-leaves few ; root-leaves spreading, oblong, toothed ; plant
. Flowers of the field. Botany. Arabis Thaliana (Thale Rock Cress) THALAMIFLOR7E 4. A. alpina (Alpine Rock Cr<tss).—Flowers larger than in tlie last; stem-haves toothed, downy. A rare species only found in ilie Isle of Skye.—Perennial. 5. .4. ciliata (Fringed Rock Cress).—Stem about 6 inches high, smooth ; leaves smooth on both sides, fringed with hairs at the edges ; flowers white. Con- fined to a few localities in South Wales and the west of Ireland.—Perennial. 6. A. thaliana (Thale Ro"ck Cress).—Stem 6-12 inches high ; stem-leaves few ; root-leaves spreading, oblong, toothed ; plant covered with short hairs ; flowers small, white ; seed-pqds twice as long as the stalks which bear them. Walls and banks, common. —Fl. all the summer. Annual. 7. A. stricta (Bristol Kocjc Cress).—Plant about 6 inches high ; stem-leaves few ; root-leaves forming a tuft, hairy, pinnate ; flowers yellowish white. Limestone rocks near —Fl. spring. Perennial. ' S. A. petraa (Northern Rock Cress).—Stems about 6 inches, branched below ; root-leaves usually smooth, pinnate ; flowers white with a purplish tinge. Moun- tains in Scotland and summer. Perennial. Xi 16. Barbarea {Winter Cress 1. B. vulgaris (Common Winter Cress).— Lower leaves lyrate, the terminal lobe roundish ; upper obovate, toothed. Common in moist waste ground, where it may be readily detected by its smooth, shining, dark green leaves, and its erect angulair stem, bearing numerous bright yellow flowers. A variety with double flowers is freriuent in gardens under the name of Yellow Rocket. —Fl. May to August. Perennial. 2. B. prcEcox (American Cress).—Distin- guished by its slender habit and naiT0\y ^..-,, leaves, but it is only an escape from gardens, '"^2/^ and is used for salad.—Biennial. Botanists have distinguished several forms p ^^^ .^^j. ,^ yulg \ris of B. vulgaris; some of them are of rare (Common Winter Ciss) occurrence, and the differences by which they are
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