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FOC | Family List | FOC Vol. 11 | Aceraceae | Acer

81. Acer ukurunduense Trautvetter & C. A. Meyer, Fl. Ochot. Phaenog. 1: 24. 1856.

花楷枫 hua kai feng

Acer caudatum Wallich subsp. ukurunduense (Trautvetter & Meyer) A. E. Murray; A. caudatum var. ukurunduense (Trautvetter & Meyer) Rehder; A. dedyle Maximowicz; A. lasiocarpum H. Léveillé & Vaniot; A. spicatum var. ukurunduense (Trautvetter & Meyer) Maximowicz; A. spicatum var. ussuriense Budishchev; A. ukurunduense var. changbaishanense W. Cao.

Trees 8-10 m tall, andromonoecious. Bark light grayish brown, slightly fissured. Branchlets light grayish brown or purplish brown, glabrous; winter buds shortly conical, densely yellow pubescent, scales 2 or 3 pairs. Leaves deciduous; petiole 5-8 cm, slightly pubescent or glabrescent; leaf blade adaxially dark green, suborbicular, 10-12 × 7-9 cm, membranous or papery, abaxially densely yellowish tomentose, adaxially glabrescent, primary veins slightly prominent abaxially, secondary reticulate veins conspicuous abaxially, base truncate or subcordate, 5(or 7)-lobed; lobes broadly ovate, rarely triangular-ovate, margin coarsely serrate, with broad acute or ± obtuse teeth, apex acuminate. Inflorescence terminal, erect, racemose-paniculate, compact, from leafy branchlets; peduncles (8-)10-12 cm. Pedicel (5-)8 mm, pubescent. Sepals 5, lanceolate, ca. 2 mm, outside pubescent. Petals 5, narrowly oblanceolate, ca. 3 mm. Stamens 8, or 7-10, glabrous, inserted at middle of disk. Disk extrastaminal, glabrous, lobed. Ovary densely pubescent. Nutlets flat, ca. 6 mm in diam., puberulent; wing including nutlet 1.5-2 cm × ca. 6 mm, wings spreading erectly. Fl. May, fr. Sep. 2n = 26.

Coniferous or mixed forests, thickets on stony slopes, riverbanks; 500-2500 m. Heilongjiang, Jilin, Liaoning [Japan, Korea, E Russia].

Two of us (Chang and de Jong) believe that this species would be better treated as a subspecies of Acer caudatum, i.e., A. caudatum subsp. ukurunduense (Trautvetter & Meyer) A. E. Murray. However, one of us (Chen) does not agree.


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