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FOC | Family List | FOC Vol. 19 | Berberidaceae | Mahonia

4. Mahonia oiwakensis Hayata, Icon. Pl. Formosan. 6: 1. 1916.

阿里山十大功劳 a li shan shi da gong lao

Berberis caelicolor (S. Y. Bao) Laferrière; B. discolorifolia (Ahrendt) Laferrière; B. lomariifolia (Takeda) Laferrière; B. lomariifolia var. estylis (C. Y. Wu ex S. Y. Bao) Laferrière; B. oiwakensis (Hayata) Laferrière; Mahonia alexandri C. K. Schneider; M. caelicolor S. Y. Bao; M. discolorifolia Ahrendt; M. hainanensis C. M. Hu, Ze X. Li & F. W. Xing; M. lomariifolia Takeda; M. lomariifolia var. estylis C. Y. Wu ex S. Y. Bao; M. morrisonensis Takeda.

Trees, 1-7 m tall. Leaves abaxially yellowish green, adaxially dark green, oblong-elliptic, 15-42 × 8-15 cm; leaflets 12-20 pairs, lowest pair 0.5-1 cm above base of petiole, abaxially slightly veined or veins obscure; rachis 2-3 mm thick; internodes 1.5-5 cm, decreasing in length apically, petiolule 5-10 mm or leaflets sometimes sessile; lowest leaflets ovate to suborbicular, 1.5-3 × 1-1.5 cm, apically becoming ovate-lanceolate or lanceolate, 2-10 × 1-2.5 cm, base rounded, margin 2-9-spinose-serrate on each side, apex cuspidate-acuminate; terminal leaflet 4-6.5 × 0.9-1.5 cm. Inflorescence 7-18-fascicled racemes, 9-25 cm; bracts of inflorescence broadly lanceolate to ovate, 1.5-3 cm × 6-10 mm. Pedicel (2-)5-6 mm; floral bracts ovate, 3-3.5 × 1.5-1.8 mm. Outer sepals golden yellow, ovate to suborbicular, 1.2-3 × 1.1-2 mm; median sepals elliptic to ovate, (3-)5-6 × 2.5-3 mm; inner sepals golden yellow, elliptic to oblong, 5-7 × 2.6-3.5 mm. Petals golden yellow, oblong, 4.5-6.5 × 2-2.8 mm, base with distinct glands, apex narrowly incised, acute. Stamens 3-4 mm; anther connective slightly prolonged, subapiculate or rounded. Ovary 3.2-4 mm; ovules 2 or 3; style 0.5-1 mm. Berry blue or bluish black, pruinose, ovoid, 6-8 × 5-6 mm; style persistent, ca. 1 mm. Fl. Aug-Nov, fr. Nov-May.

● Broad-leaved forests, thickets, forest margins, slopes; 600-3800 m. Guizhou, Hong Kong (probably introduced), Sichuan, Taiwan, Xizang, Yunnan.

Mahonia oiwakensis is one of a number of plants with a disjunct distribution on Taiwan and in C and SW China.


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