台湾五裂枫 tai wan wu lie feng

Acer oliverianum Pax subsp. formosanum (Koidzumi) A. E. Murray; A. oliverianum subvar. formosanum Koidzumi; A. oliverianum f. longistamineum Hayata; A. oliverianum var. microcarpum Hayata; A. oliverianum var. nakaharae Hayata.

Trees to 20 m tall. Branchlets glabrous. Petiole 3-7.5 cm, glabrous; leaf blade wholly orbicular-cordate to orbicular in outline, 3.5-12 × 4.5-16.5 cm, both surfaces glabrous, veinlets reticulate, palmately 5-lobed, rarely 3- or 4-lobed; lobes triangular-lanceolate to triangular-ovate, truncate to cordate at base, margin duplicately crenate-serrate. Flowers in terminal corymbose cymes; peduncle 3-5 cm, glabrous. Sepals 5, orbicular-oblong, ca. 2 mm, outside hirsute toward apex, margin ciliate. Disk 8-lobed, round, thick. Pistillate flowers: staminodes 5-8; anthers oblong; filaments ca. 1 mm; ovary hirsute; styles ca. 2 mm, connate at base. Staminate flowers ca. 6 mm in diam.; stamens 8, ca. 4 mm; anthers oblong. Fruit brown; nutlets globose, 3-4 mm in diam., glabrous; wing including nutlet 1.8-2.5 cm, wings spreading obtusely. Fl. Mar-Apr, fr. Jun-Oct.

● Forests; 1000-2000 m. C and N Taiwan.

Acer serrulatum has more flowers and different flavonoid patterns than the preceding species, A. oliverianum.