''Adenostoma'' is a genus of shrubs in the rose family (

Rosaceae Rosaceae (), the rose family, is a family of flowering plants that includes 4,828 known species in 91 genera. The name is derived from the type genus '' Rosa''. The family includes herbs, shrubs, and trees. Most species are deciduous, but som ...

) containing only two species, chamise (''

Adenostoma fasciculatum ''Adenostoma fasciculatum'', commonly known as chamise or greasewood, is a flowering plant native to California and Baja California. This shrub is one of the most widespread plants of the California chaparral ecoregion. Chamise produces a specia ...

'') and redshanks ('' Adenostoma sparsifolium''). Both are native to the Californias.

Description

Characteristics

The plants grow in a habit of shrubs to small trees, and the stem is more or less resinous. Both species in this genus feature stiff, linear leaves arranged alternately or in clusters along stems with shredding bark. Flowers form on a

panicle In botany, a panicle is a much-branched inflorescence. (softcover ). Some authors distinguish it from a compound spike inflorescence, by requiring that the flowers (and fruit) be pedicellate (having a single stem per flower). The branches of a p ...

, are cream to white and, as in all members of the

rose family Rosaceae (), the rose family, is a family of flowering plants that includes 4,828 known species in 91 genera. The name is derived from the type genus ''Rosa''. The family includes herbs, shrubs, and trees. Most species are deciduous, but some ...

, have hypanthia. The fruit is an achene. Chromosome number is 2n = 18.

Distribution and habitat

Both species are native to coastal

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

and

Baja California Baja California, officially the Free and Sovereign State of Baja California, is a state in Mexico. It is the northwesternmost of the 32 federal entities of Mexico. Before becoming a state in 1952, the area was known as the North Territory of B ...

. ''Adenostoma fasciculatum'' is also native to California in the

Sierra Nevada The Sierra Nevada ( ) is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primari ...

.Jepson Manual, University of California, 1993; ''Adenostoma''
/ref> They are found in plant communities and sub-ecoregions of the

California chaparral and woodlands The California chaparral and woodlands is a terrestrial ecoregion of southwestern Oregon, northern, central, and southern California (United States) and northwestern Baja California (Mexico), located on the west coast of North America. It is a ...

ecoregion.

Taxonomy

File:Chamise resprout Mag Road III.jpg, ''

'' Hook. &

Arn. George Arnott Walker Arnott of Arlary (6 February 1799 – 17 April 1868) was a Scottish botanist. He collaborated with botanists from around the world and served as a regius professor of botany at the University of Glasgow. An orchid genus ' ...

- Chamise File:Redshanks imported from iNaturalist photo 50466530 on 18 December 2021.jpg, '' Adenostoma sparsifolium'' Torr. - Redshanks Phylogenetic analysis places ''Adenostoma'' closest to '' Chamaebatiaria'' and ''

Sorbaria ''Sorbaria'' is a genus of around four species of flowering plants belonging to the family (biology), family Rosaceae. Species Accepted species include: *''Sorbaria grandiflora'' (Sweet) Maxim. *''Sorbaria kirilowii'' (Regel) Maxim. *''Sorbaria ...

'', and suggests tentative placement in the subfamily Spiraeoideae, tribe Sorbarieae. The name ''Adenostoma'' comes from Greek, meaning "glandular mouth," referring to the hypanthium ring gland.

References

External links

Sorbarieae Rosaceae genera Flora of California Flora of Baja California Natural history of the California chaparral and woodlands Flora without expected TNC conservation status Taxa named by George Arnott Walker Arnott Taxa named by William Jackson Hooker {{amygdaloideae-stub