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

Rosaceae Rosaceae (), the rose family, is a medium-sized family of flowering plants that includes 4,828 known species in 91 genera. The name is derived from the type genus ''Rosa''. Among the most species-rich genera are '' Alchemilla'' (270), '' Sorbu ...

) containing only two species, chamise ('' Adenostoma fasciculatum'') 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 A panicle is a much-branched inflorescence. (softcover ). Some authors distinguish it from a compound spike inflorescence, by requiring that the flowers (and fruit In botany, a fruit is the seed-bearing structure in flowering plants that is ...

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

hypanthia In angiosperms, a hypanthium or floral cup is a structure where basal portions of the calyx, the corolla, and the stamens form a cup-shaped tube. It is sometimes called a floral tube, a term that is also used for corolla tube and calyx tube. It ...

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

Distribution and habitat

Both species are native to coastal

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the ...

and

Baja California Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...

. ''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 ...

ecoregion.

Taxonomy

File:Chamise resprout Mag Road III.jpg, '' Adenostoma fasciculatum'' Hook. & Arn. - 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'', 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 {{amygdaloideae-stub