Heteropanax fragrans (Roxb.) Seem.

This species is used medicinally and for timber.

Trees, to 30 m tall. Leaves 3-5-pinnately compound, 50-100 cm; petiole 15-450 cm, glabrous; leaflets opposite, subsessile or with petiolules to ca. 1 cm, elliptic to elliptic-ovate, (3-)5.5-13 × (1.5-)3.5-6 cm, papery, both surfaces glabrous, lateral veins 6-10 pairs, distinct on both surfaces, base cuneate to rounded, margin entire, minutely revolute, apex shortly acuminate. Inflorescence densely ferruginous stellate tomentose, glabrescent; primary axis to 30 cm or more; secondary axes to 40 cm; peduncles to 9 cm; umbels of bisexual flowers 2-2.5 cm in diam., umbels of male flowers 1-1.5 cm in diam.; pedicels 4-8 mm, elongating in fruit. Fruit ovoid-globose to oblate or slightly didymous, weakly compressed laterally, 5-7 × 3-5 mm at maturity, 2-3 mm thick; styles persistent, ca. 2 mm; pedicels ca. 8 mm. Fl. Oct-Dec, fr. Feb-Apr.

Himalaya (Kumaun to Assam), India, Burma, Andaman Isl., Indo-China, W. & C. China.

S Fujian, Guangdong, Guangxi, Hainan, SE Yunnan [Bhutan, India, Indonesia, Myanmar, Nepal, Thailand, Vietnam].

400-1000 m

Hills, forests in valleys, or cultivated in gardens, near sea level to 1000 m.

Panax fragrans Roxburgh ex Candolle, Prodr. 4: 254. 1830; Heteropanax fragrans var. attenuatus C. B. Clarke; H. fragrans var. ferrugineus Y. F. Deng; H. fragrans var. subcordatus C. B. Clarke.

Heteropanax fragrans is an evergreen plant in the Araliaceae family. The leaves of this arboreal plant are fed on by the larvae of the Eri silk moth (Samia ricini). In the Mizo language it is known as Changkhen and in Assamese it is called Keseru. The tree is found in Assam; Bangladesh; Cambodia; South Central China; China Southeast; Eastern Himalayas; Hainan; India; Myanmar; Nepal; Vietnam; Western Himalayas; Thailand.

Đối với các định nghĩa khác, xem Tung (định hướng).

Sâm thơm hay còn gọi dị sâm thơm, tung trắng (danh pháp khoa học: Heteropanax fragrans) là một loài thực vật có hoa trong Họ Cuồng. Loài này được (Roxb.) Seem. mô tả khoa học đầu tiên năm 1866.

幌伞枫（学名：Heteropanax fragrans）是五加科幌伞枫属的植物。分布在印度尼西亚、锡金、孟加拉、不丹、印度、缅甸以及中国大陆的广西、广东、云南等地，生长于海拔300米至1,000米的地区，常生长在森林中，目前尚未由人工引种栽培。