. Flowers of the field. Botany. CRUCIFEROUS TRIBE 29 23. Brassica (Cabbage) 1. B. tenuifolia (Wall Rocket).—Stem erect, slender, smooth, leafy ; leaves narrow, smooth, deeply divided into narrow segments ; pods lined, slightly heaked, erect. A slender, branched plant, from 1-2 feet high, with a tough stem, woody below, scattered foliage, and large light }?el]ow flowers ; it grows on old walls, quarries, and waste places, principally in the neighbourhood ol large towns.—Fl. all the summer. Perennial. 2. B. niuyalis (Sand Rocket).—An annual, with a bristly stem, is very like the last, but smalle
. Flowers of the field. Botany. CRUCIFEROUS TRIBE 29 23. Brassica (Cabbage) 1. B. tenuifolia (Wall Rocket).—Stem erect, slender, smooth, leafy ; leaves narrow, smooth, deeply divided into narrow segments ; pods lined, slightly heaked, erect. A slender, branched plant, from 1-2 feet high, with a tough stem, woody below, scattered foliage, and large light }?el]ow flowers ; it grows on old walls, quarries, and waste places, principally in the neighbourhood ol large towns.—Fl. all the summer. Perennial. 2. B. niuyalis (Sand Rocket).—An annual, with a bristly stem, is very like the last, but smaller, and grows in barren places near the sea, but is not considered indigenous. 3. B. Monensis (Isle of Man Cabbage).—Leaves glaucous, pinna- tifid ; stem nearly leafless, and 6-12 inches high ; pods 4-angled ; flowers bright lemon-coloured, veined with purple. Sandy sea- shores on the western coast of Britain, rare.—Fl. summer. Per- ennial. 4. B. oleracea (Sea Cabbage).—Root stem-like, fleshy; stem branched, T-2 feet liigh ; leaves perfectly smooth, glaucous, waved, lobed ; stem-leaves oblong, obtuse; flm&ers lemon-coloured and large. The original of all the varieties of garden cabbage growing on several parts of the sea-coast.—Fl. May to August. Biennial. 5. B. campestris (Common Wild Navew).—Root-leaves pinnate, with rounded terminal lobe, toothed, rouglnsh ; stem-leaves smooth, heart-shaped, tapering to a point ; all somewhat glaucous ; stem about 2 feet high, usually unbranchcd. Borders of fields, common. Often con- founded with Charlock, from which, how- ever, it may readily be distinguished by the smoothness and glaucous hue of its upper leaves.—Fl. June, July. Annual. B. rapa, Rape or Colza; B. rutabaga, the Swedish turnip, commonly known as Swede; and B. napits, the Turnip, are all varieties in cultivation. 6. B. alba (White Mustard).—Po(^s bristly, rugged, spreading, shorter than the flat two- edged beak ; leaves pinnatifid; flowers rather large,
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