Ilex pentagona S. K. Chen, Y. X. Feng & C. E Liang

Trees evergreen, 8-12 m tall. Current year’s branchlets castaneous when dry, stout, 5-6 mm in diam., glabrous, longitudinally sharply angular; terminal buds ovoid-conical, ca. 6 mm, glabrescent or very shortly puberulent. Petiole 2-2.5 cm, abaxially rugose, adaxially narrowly sulcate, glabrous; leaf blade abaxially greenish, adaxially dark green, slightly shiny, narrowly elliptic to elliptic, 7.5-20 × 3-7.5 cm, leathery, both surfaces glabrous, midvein deeply narrowly sulcate adaxially, lateral veins 12 pairs, evident or indistinct abaxially, slightly raised adaxially, furcate and anastomosing near margin, reticulate veins obscure abaxially, evident adaxially, base cuneate to obtusely rounded, margin sparsely and shallowly serrulate, slightly reflexed, apex obtuse or acute. Flowers not known. Infructescences: 1-fruited cymes, pseudoracemose, axillary on first to second year’s branchlets; central axis 5-10 mm, robust, glabrous, longitudinally angular and sulcate; fruiting pedicels 5-6 mm, glabrous; bracteoles ovate, ca. 1.5 mm, apex obtuse, minutely ciliate. Fruit (immature) globose, 6-8 mm in diam., rugose when dry; persistent calyx explanate, orbicular, ca. 3 mm in diam., minutely ciliate; persistent stigma discoid, slightly impressed; pyrenes 4, oblong-ellipsoid or ovoid-globose, 5-6 mm, 3-4 mm in diam., abaxially striate and sulcate. Fl. unknown, fr. May, Sep-Oct.

W Guangxi (Daxin, Tian’e), Guizhou (Suiyang), Hunan (Baojing), SE Yunnan (Xichou).

● Forests on limestone hills; 300-600 m or 1400-1500 m.

Ilex pentagona là một loài thực vật có hoa trong họ Aquifoliaceae. Loài này được S.K. Chen, Y.X. Feng & C.F. Liang mô tả khoa học đầu tiên năm 1998.

五棱苦丁茶（学名：Ilex pentagona）是冬青科冬青属的植物，为中国的特有植物。分布在中国大陆的湖南、贵州、云南等地，生长于海拔1,400米至1,500米的地区，一般生长在石灰山林中，目前已由人工引种栽培。