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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: 589

     70. ACERACEAE 槭樹科
    LI, HUI-LIN and LO, HANN-CHUNG

    Trees or shrubs, unarmed, without latex; branches pertaining green. Leaves opposite, estipulate, simple or pinnately compound. Flowers in axillary or terminal racemes, panicles, corymbs, umbels or spikes, andropolygamous and monoecious or dioecious, or unisexual and dioecious, seemingly bisexual, actinomorphic, usually 4-5 merous; sepals free, overlapping in bud; petals sometimes none, mostly equal in number to the sepals, overlapping in bud, at the base without a scale; disk annular, lobed; stamens 4-12, usually 8, on, around or within the disk; filaments free, filiform; anthers inserted in a basal cleft or medifixed; cells 2, longitudinally dehiscent; ovary superior, 2-lobed, 2-celled, compressed contrary to the septum; ovules 2 in each cell, orthotropous to anatropous; styles 2, or one 2-armed. Fruit a samara; mericarps 2, separating when ripe, winged on the endosperm; embryo with folded cotyledons.
    A family of 3 genera, about 200 species, mainly in north temperate zone.

    1. ACER L. 槭屬

    Mericarps winged only on the outer side of the top; otherwise characters of the family.
    ca. 190 species. In Taiwan 6 species.

    KEY TO SPECIES AND VARIETIES
    1. Leaves entire.
    2. Leaves undivided, rarely indistinctly 3-lobed… 1. A. albopurpurascens
    2. Leaves shallowly 3-lobed… 2. A. buergerianum var. formosanum
    1. Leaves serrate.
    3. Leaves undivided to slightly 3-lobed… 3. A. kawakami
    3. Leaves distinctly 5- or 7-lobed.
    4. Leaves all 5-lobed.
    5. Leaves shallowly 5-lobed, petioles red… 4. A. morrisonense
    5. Leaves deeply 5-lobed, petioles green… 6. A. serrulatum
    4. Leaves 7-lobed… 5. A. palmatum var. pubescens

    1. Acer albopurpurascens Hayata, Icon. Pl. Form. 1: 154. 1911; Li in Fl. Taiwan 3: 575. 1977. 樟葉槭 Pl.303
    Acer hypoleucum Hayata, Icon. Pl. Form. 3: 66. pl. 14c. 1913; Li in Fl. Taiwan 3: 576. 1977.
    Acer litsaefolium Hayata, Icon. Pl. Form. 3: 66. pl. 14b. 1913; Li in Fl. Taiwan 3: 575. 1977.
    Acer oblongum auct. non Wall.: Matsumura & Hayata, Icon. Pl. Form. 6: 96. 1906.
    Trees, evergreen, up to 15 m high; branchlets pubescent at first, soon glabrous. Leaves persistent, oblong-lanceolate, 2.5-13 cm long, 1-4 cm broad, caudate to acuminate at apex, obtuse to cuneate at base, coriaceous, pale green and glabrous above, white-purplish glaucous beneath, densely pubescent when young, 3-nerved at base, nerves slightly raised beneath; petioles 0.7-3.5 cm long, glaucous. Flowers small; pedicels short, 1.5-2 mm long; sepals 5, rounded ovate; petals 5, oblong ovate; disk not distinct, hairy appendages abundant; stamens 8. Pistillate flowers 6 mm across; sepals 1.5 mm long, pubescent outside; petals 3 mm long; staminodes short, anthers oblong, 1 mm long, filament shorter; ovary broadly rounded,