. The botany of crop plants : a text and reference book. Botany, Economic. CHAPTER XXV CRUCIFER^ (Mustard Family) This family is of world-wide distribution. There are in the neighborhood of 2,000 species in 180 genera. The largest number of genera and species is found in southern Europe and Asia Minor. They are found from low to high latitudes and from low to high altitudes. Many of the genera yield crop plants, such as cabbage, turnip, rutabaga, rape, black mustard, white mustard, radish, water cress and horse radish, while a number of genera include per- nicious weeds, such as penny cress, w
. The botany of crop plants : a text and reference book. Botany, Economic. CHAPTER XXV CRUCIFER^ (Mustard Family) This family is of world-wide distribution. There are in the neighborhood of 2,000 species in 180 genera. The largest number of genera and species is found in southern Europe and Asia Minor. They are found from low to high latitudes and from low to high altitudes. Many of the genera yield crop plants, such as cabbage, turnip, rutabaga, rape, black mustard, white mustard, radish, water cress and horse radish, while a number of genera include per- nicious weeds, such as penny cress, wild mustard or charlock, shepherds purse, false flax, and tansy mustard. Stems, Leaves.—Most mus- tards are herbaceous; a few are woody. The sap is usually watery and acrid. The leaves are alternate, simple, and vari- ously lobed or dissected. The stipules are wanting. Inflorescence and Flowers.—The predominant type of inflorescence is a terminal raceme; rarely the flowers are solitary at the end of a scape. The mustard flower is char- 323. Fig. 131.—Cruciferae. Floral diagram above; flower in median longitudinal section Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Robbins, Wilfred William, 1884-1952. Philadelphia : P. Blakiston's Son
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