千葉大学東葛キャンパス植物データベース

属名の詳細: Euphorbia L. [306]

属和名:

属英名: Milkweed, Spurge

種数: 2046

発表年:

正名？: 正名

科名: Euphorbiaceae

科の和名: トウダイグサ

科内分類群:

原生地・分布（英語）:

説明（英語）: Very varied genus of about 2,000 species of annuals, biennials, evergreen, semi-evergreen, or herbaceous perennials, deciduous or evergreen subshrubs, shrubs, and trees, and succulents, widely distributed in a range of habitats in temperate, subtropical, and tropical regions. Most have much-reduced, usually male and female floral parts, grouped together into a cyathium; these may be solitary or borne in rounded or pyramidal, terminal or axillary cymes, umbels, or clusters, and are cupped by involucres of long-lasting, yellow, red, purple, brown, or green, fused bracts. Leaves are very variable, and often short-lived. Many euphorbias are suitable for a rock garden, a mixed or shrub border, or a woodland garden. In frost-prone areas, grow tender species in a cool or temperate greenhouse. Succulent species are suitable for a dry, tropical garden, or a warm or temperate greenhouse in frost-prone areas. All parts may cause severe discomfort if ingested; contact with their milky sap may irritate skin.

耐寒性（英語）: Fully hardy to frost tender.

栽培（英語）:

繁殖（英語）: Sow seed of annuals in situ in spring. Sow seed of hardy perennials in containers in a cold frame as soon as ripe or in spring. Divide perennials in early spring, or take basal cuttings in spring or early summer; dip cut surfaces in charcoal or lukewarm water to prevent bleeding. Sow seed of frost-tender succulents as soon as ripe at 15-20°C (59-68°F), or root complete stems, or sections of stems, in spring. Root stem-tip cuttings of shrubby and tree species with bottom heat in spring or early summer.

病害虫（英語）: Grey mould (Botrytis) may be a problem. Aphids may also be troublesome on herbaceous euphorbias, and mealybugs on succulent ones. E. cyparissias is susceptible to rust, and E. pulcherrima to whiteflies.

説明:

備考（英語）: Cosmopolitan

備考: トウダイグサ，ポインセチア(poinsettia)，ハナキリン

属のタイプ種名:

系統学的定義:

更新情報: 作成: 2007-12-06 12:51; 更新: 2022-08-08 11:58 by hkokubun@mac.com

科の学名: