''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), ''Sorbus ...

) 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 ''Adenostoma sparsifolium'', commonly known as redshanks or less commonly, ribbonwood or ribbon bush, is a multi-trunked tree or shrub native to dry slopes or chaparral of Southern California and northern Baja California. Description Shaggy fall ...

''). 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) be pedicellate (having a single stem per flower). The branches of a panicle are of ...

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

rose family 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), ''Sorbus ...

, 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 o ...

. 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, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

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 primarily ...

.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. Sir William Jackson Hooker (6 July 178512 August 1865) was an English botanist and botanical illustrator, who became the first director of Kew when in 1841 it was recommended to be placed under state ownership as a botanic garden. At Kew h ...

Arn. George Arnott Walker Arnott of Arlary (6 February 1799 – 17 April 1868) was a Scottish botanist. Early life George Arnott Walker Arnott was born in Edinburgh in 1799, the son of David Walker Arnott of Arlary. He attended Milnathort Parish ...

- Chamise File:Redshanks imported from iNaturalist photo 50466530 on 18 December 2021.jpg, ''

'' 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 Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship ...

'', and suggests tentative placement in the subfamily

Spiraeoideae The subfamily Spiraeoideae was traditionally a subfamily of flowering plants within the family Rosaceae. The taxonomy of this subfamily has changed several times in the last century as more detailed studies have been carried out. Spiraeoideae as d ...

, tribe

Sorbarieae Sorbarieae is a tribe of the rose family, Rosaceae, belonging to the subfamily Amygdaloideae Amygdaloideae is a subfamily within the flowering plant family Rosaceae. It was formerly considered by some authors to be separate from Rosaceae, and ...

. 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