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Plants of Taiwan

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    台灣植物誌 第二版  Flora of Taiwan, 2nd edition    Vol. 3

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    台灣植物誌第二版  Flora of Taiwan, 2nd edition  3: 886

     96. MYRTACEAE 桃金孃科
    CHANG, CHING-EN

    Shrubs or trees. Leaves opposite, sometimes alternate, coriaceous, more or less pellucido-punctate, simple, estipulate. Flowers bisexual, actinomorphic, solitary in the axils or in corymbs or racemes, usually bracteate; calyx-tube more or less adnate to the ovary and often elongated, sepals 4-5, imbricate, or rarely absent; stamens mostly numerous in several rows, often in fascicles opposite petals, filaments distinct or partially united, anthers 2-celled, introrse, dehiscing longitudinally or sometimes apically; ovary inferior, 1 to many-celled, with 1 to many ovules in each cell; placentation axile, rarely parietal; styles terminal, sometimes lateral; stigma undivided. Fruit a berry or loculicidal capsule, rarely drupaceous or nutlike; seeds few or many, embryo variously shaped, endosperm scanty or none.
    About 9 genera and 3,000 species, native in tropical and subtropical regions; four genera in Taiwan.

    KEY TO GENERA
    1. Flower-buds pubescent; embryo horseshoe-shaped, curved or coiled.
    2. Leaves pinnately veined, densely pellucid-dotted; ovary 4-5-celled, each mostly 2-ovuled… 2. Decaspermum
    2. Leaves trinerved, not or faintly pellucid-dotted; ovary 1-3-celled, each many-ovuled… 3. Rhodomyrtus
    1. Flower-buds entirely glabrous; embryo straight, usually globose or ellipsoid.
    3. Embryo apparently undivided or pseudomonocotyledonous; flowers small; filaments less than 1 mm long; anther-sacs divaricate, opening by a terminal slit or pore… 1. Acmena
    3. Embryo divided, i. e., with distinct cotyledons; flowers mostly large; filaments more than 1 mm long; anther-sacs parallel, opening longitudinally… 4. Syzygium

    1. ACMENA DC. 賽赤楠屬

    Trees or shrubs. Leaves opposite, coriaceous, penninerved. Flowers usually small, in racemes or panicles; calyx-tube globose or more or less elongate, lobes 4-5; petals 5 or 4; stamens numerous, free, in many series, filaments filiform, anther-sacs divaricate, opening by a terminal slit or pore; ovary 2-3-celled, styles filiform, ovules several in each cell. Berry drupaceous. Seeds few; seed-coat loosely or closely adhering to pericarp; embryo apparently undivided.
    Two species widely ranging from Burma and southern China through Malaysia and the Philippines to Australia and Solomon Islands; one species in Taiwan.

    1. Acmena acuminatissima (Blume) Merr. & Perry in Journ. Arnold Arb. 19: 12. 1938; Chang in Fl. Taiwan 3: 826. 1977. 賽赤楠 Pl.441, Photo 72
    Myrtus acuminatissima Blume, Bijdr. Fl. Nederl. Ind. 1088. 1826.
    Eugenia cumingiana Vidal, Phan. Cuming. Philipp. 173. 1885; Liu, Ill. Nat. Intr. Lign. Pl. Taiwan 265. f. 218. 1960.
    Eugenia cuspidato-obovata Hayata, Icon. Pl. Form. 3: 116. 1913; Kanehira, Form. Trees rev. ed. 501. f. 462. 1936.
    Syzygium cuspidato-obovatum (Hayata) Mori in Trans. Nat. Hist. Soc. Form. 28: 439. 1938; Li, Woody Fl. Taiwan 649. 1963.
    An evergreen medium tree, branchlets slightly 4-angular. Leaves opposite or sometimes subalternate,