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十字花科Brassicaceae.doc

花匠小妙招
2025-07-22 00:17

十字花科Brassicaceae

十字花科Brassicaceae 1-Floral formulaHere is the floral for the Brassicaceae. The flowers are usually perfect. There are 4 sepals, 4 petals, 6 (SIX!) stamens that are tetradynamous, and a syncarpous gynoecium of 2 carpels. 2-IntroductionThe 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 Asia. 3-Cross-like flowersThe Brassicaceae often has cross-like flowers with 4 petals. The traditional name for this family, Cruciferae, refers to this kind of flower. 4-Brassica habitAlmost all members of the Brassicaceae are herbaceous plants (annual, biennial, or perennial). The leaves are often pinnately lobed or compound. Many have mustard oil glucosides. This is a field of canola (Brassica rapa) growing in Mason County, Illinois. 5-Brassica racemesThe inflorescence type in the Brassicaceae is usually a bractless raceme. This is canola (Brassica rapa) growing in Mason County, Illinois. 6-Brassica 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 (Brassica rapa) . 7-Developing fruitsDeveloping 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 flowerAn exploded flower of Barbarea vulgaris, Winter cress. 9-CardamineA raceme of Cardamine bulbosa, Bitter cress, with flowers at the top and developing SILIQUES below. 10-CapsellaA raceme of Capsella bursa-pastoris, Shepherds purse, with flowers at the top and developing SILICLES below. 11-LepidiumA raceme of Lepidium campestre, Peppergrass, wit