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桉属植物分类检索介绍.doc

来源：花匠小妙招时间：2025-05-19 19:37

桉属植物分类检索介绍

桉属植物分类检索介绍　 EUCALYPTUS L Héritier, Sert. Angl. 18. 1789. 桉属 an shu Trees or shrubs. Leaves usually polymorphic with different juvenile and mature forms and sometimes with intermediate forms. Juvenile leaves opposite, 3 to several pairs, shortly pedicellate or sessile; leaf blade often glaucous or glandular hairy. Mature leaves alternate, petiolate; leaf blade usually leathery, secondary veins numerous, with intramarginal veins. Umbels consisting of several flowers, axillary or clustered into terminal or axillary panicles. Flowers bisexual; pedicel present or absent. Calyx tube campanulate, obconical, or semiglobose, apex usually truncate. Petals connate, either adnate with calyx lobes into a 1-layered calyptra or not adnate with connate calyx lobes and forming a 2-layered calyptra; calyptra deciduous at anthesis. Stamens numerous, usually free, in several whorls with outer whorl usually sterile; anthers basifixed or dorsifixed, 2-celled, parallel or free, elliptic, ovate, cordate, or bifurcate, dehiscing longitudinally or occasionally poricidally. Ovary adnate with calyx tube, 3--6-loculed, apex gibbous; ovules numerous. Style persistent and not splitting. Whole or most of capsule included in expanded calyx tube, usually forming into a coccus when apical part protruding calyx tube, usually split into 3--6, margins formed when disk ampliate and produced calyx tube, coccus inserted on apex of margins. Seeds numerous, many sterile and undeveloped, developed seeds ovate or angular; testa rigid, sometimes ampliate into wings. About 600 species: mainly in Australia; 27 species commonly cultivated in China. In addition to Eucalyptus species treated here the following additional species are recorded as being cultivated in China: E. acaciiformis Deane Maiden E. aggregata Deane Maiden E. amygalina Labillardière (E. salicifolia (Solander) Cavanilles) E. bosistoana F. Mueller, E. camphora R. Baker E. cinerca F. Mueller E. cloezian