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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: 872

     95. LYTHRACEAE 千屈菜科
    HUANG, TSENG-CHIENG

    Herbs, shrubs or trees; branches often quadrangular. Leaves opposite or whorled, seldom altenate, entire; stipules 0. Flowers bisexual, regular or rarely irregular, mostly axillary, solitary or in cymes or panicles; calyx-tube free, persistent, the lobes 3-6, valvate, often with accessory lobes; petals as many as calyx-lobes and inserted at the mouth of calyx, imbricate, or rarely 0; stamens few or many, inserted on the calyx; ovary superior, sessile or stalked, 2-6- or rarely 1-celled, with many, seldom few, ovules in each cell; style simple, the stigma capitate, rarely 2-lobed. Fruit a dehiscent or indehiscent capsule, free or adnate to the base of calyx, 2-6-celled or 1-celled by the imperfection of the partitions; seeds many, various in shape; endosperm 0; embryo straight.
    More than 20 genera, widely distributed but most abundant in tropical America; five genera in Taiwan.

    KEY TO GENERA
    1. Trees or shrubs; flowers large.
    2. Seeds winged; flowers in panicles; placentas axile, fruit dehiscing by 3-6-valves… 3. Lagerstroemia
    2. Seeds not winged; flowers solitary, axillary, placentas subbasal; fruit transversally dehiscent… 4. Pemphis
    1. Herbs; flowers small.
    2. Flowers zygomorphic; calyx-tube appendaged at base… 2. Cuphea
    3. Capsules dehiscent septicidally; flowers usually solitary… 5. Rotala
    3. Capsules dehiscent irregularly; flowers usually more than three… 1. Ammannia

    1. AMMANNIA L. 水莧菜屬

    Herbs of wet places or aquatic; stems and branches often 4-angled; leaves opposite; inflorescence cymose, with small, white membranous bracteoles; flowers 4(-6)-merous; stamens 2-8, inserted inside the tube; calyx-tube campanulate or urceolate; petals caduous or none; ovary 1- or incompletely 2-4-locular; capsules irregularly dehiscent; seeds numerous.
    About 20 species in the Tropics and warm-temperate N. Amenca and Asia. Three species in Taiwan.

    LITERATURE

    Chen, S. H. 1987. Three naturalized species for the Flora of Taiwan. Quart. Journ. Chin. For. 20(1): 109-111.

    KEY TO SPECIES
    1. Flowers apetalous; leaves narrowed at the base… 1. A. baccifera
    1. Flowers petaliferous; leaves more or less auricled at base.
    2. Flowers 4-merous; leaves broader… 2. A. multiflora
    2. Flowers 5-merous; leaves narrower… 3. A. coccinea

    1. Ammannia baccifera L., Sp. Pl. 1: 120. 1753. 水莧菜 Pl.433
    Ammannia indica Lam., 3(1): 311. 1791.
    Ammannia baccifera subsp. baccifera (L.) Koehne in Engler, Bot. Jahrb. 1: 258. 1880.