Swertia arisanensis Hayata

Annuals to 90 cm tall. Roots yellow-brown, fibrous. Stems erect, to 8 mm in diam., subquadrangular, narrowly winged on angles, branched. Basal leaves withered at anthesis. Stem leaves sessile or subsessile, lanceolate to oblong, 4-8 × to 3 cm, thin herbaceous, base rounded, apex acute to obtuse, veins 3; uppermost leaves much smaller; leaf blade lanceolate, apex acuminate. Inflorescences panicles of cymes, spreading branched, many flowered. Flowers 4merous. Pedicel erect, 0.5-1.5 cm, thickened apically, with narrow wings. Calyx tube 1-2 mm; lobes lanceolate, 5-10 mm, apex acuminate; veins 3, prominent. Corolla pale yellow-green, veins purple, tube 1-2 mm; lobes lanceolate, 6-8 mm, apex acuminate. Nectaries 1 per corolla lobe, pocket-shaped, with an orbicular scale and many, minutely hairy, short fimbriae at apex of pocket. Filaments ca. 3 mm; anthers ellipsoid, ca. 1 mm. Style short, distinct; stigma lobes capitate. Capsules ovoid-ellipsoid, ca. 1 cm. Seeds brown, ovoid, ca. 0.6 mm; seed coat rugose. Fl. and fr. Oct-Nov.

C and E Taiwan.

* Forests; 2000-3000 m.

Swertia alata Hayata (1908), not (Royle ex D. Don) C. B. Clarke (1883).

Swertia arisanensis là một loài thực vật có hoa trong họ Long đởm. Loài này được Hayata miêu tả khoa học đầu tiên năm 1911.

阿里山當藥（学名：Swertia arisanensis），即阿里山獐牙菜，为龍膽科當藥屬下的一个种。