十字花科Brassicaceae文档格式.docx

1、） stamens that are tetradynamous, and a syncarpous gynoecium of 2 carpels. 2-Introduction The Brassicaceae （or Cruciferae） is found nearly worldwide, but is particularly diverse in temperate and cool regions of the Northern Hemisphere, in the Mediterranean region, and in southwestern and central Asi

2、a.3-Cross-like flowers The Brassicaceae often has cross-like flowers with 4 petals. The traditional name for this family, Cruciferae, refers to this kind of flower. 4-Brassica habit Almost all members of the Brassicaceae are herbaceous plants （annual, biennial, or perennial）. The leaves are often pi

3、nnately lobed or compound. Many have mustard oil glucosides. This is a field of canola （Brassica rapa） growing in Mason County, Illinois. 5-Brassica racemes The inflorescence type in the Brassicaceae is usually a bractless raceme. This is canola （Brassica rapa） growing in Mason County, Illinois. 6-B

4、rassica flowers l.s. Flower of Brassica rapa with one sepal, 2 petals, and 2 stamens removed. The complete flower has 4 distinct sepals, 4 distinct petals, 6 stamens （tetradynamous with 4 long and 2 short）, and a syncarpous gynoecium of 2 carpels and a superior ovary. This example is canola （Brassic

5、a rapa） . 7-Developing fruits Developing fruits of Hesperis matronalis, Dames rocket. These long and sleek fruits are siliques, which dehisce into two parts, leaving a replum behind （not shown）. 8-Exploded flower An exploded flower of Barbarea vulgaris, Winter cress. 9-Cardamine A raceme of Cardamin

6、e bulbosa, Bitter cress, with flowers at the top and developing SILIQUES below. 10-Capsella A raceme of Capsella bursa-pastoris, Shepherds purse, with flowers at the top and developing SILICLES below. 11-Lepidium A raceme of Lepidium campestre, Peppergrass, with flowers at the top and developing SIL

7、ICLES below. 12-Brassica oleracea A field of broccoli that has gone to flower. The species Brassica oleracea has given rise to many vegetable crops: broccoli, cabbage, cauliflower, Brussels sprouts, and kale. 13-Brassica oleracea Young cabbages, another type of Brassica oleracea, planted in a garden at Carters Plantation, near Williamsburg, Virginia.