| Glehnia | |
|---|---|
|   | |
| Scientific classification   | |
| Kingdom: | Plantae | 
| Clade: | Tracheophytes | 
| Clade: | Angiosperms | 
| Clade: | Eudicots | 
| Clade: | Asterids | 
| Order: | Apiales | 
| Family: | Apiaceae | 
| Subfamily: | Apioideae | 
| Tribe: | Selineae | 
| Genus: | Glehnia F.Schmidt | 
| Species: | G. littoralis | 
| Binomial name | |
| Glehnia littoralis | |
| Synonyms [1] | |
| 
 | |
Glehnia is a genus of plants in the carrot family, Apiaceae. It is monotypic, being represented by the single species, Glehnia littoralis, [2] commonly known as beach silvertop and American silvertop. The genus was named after Russian botanist Peter von Glehn. [3]
It is a long-taprooted plant forming a basal patch of leaves, with each leaf made up of several rounded, lobular segments. It reaches a maximum height exceeding .5 metres (1+1⁄2 feet), with the North American subspecies only reported to reach 6.5 centimetres (2+1⁄2 inches). [4] The plant's erect stem is topped with an umbel of carrotlike white flowers.
 
 The plant contains naphthisoxazole A. [5]
Two subspecies exist, one in Asia and one in North America; the latter is named leiocarpa. [4]
It is native to eastern Asia, particularly eastern China, Japan, and far-eastern Russia, and western North America from Alaska to northern California. It can be found on sandy beaches and dunes. [4]
The plant is perhaps best known as a Chinese herbal remedy for cough. [6]