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Galium buxifolium

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Gentianales

Familia: Rubiaceae
Subfamilia: Rubioideae
Tribus: Rubieae
Genus: Galium
Species: Galium buxifolium

Galium buxifolium Greene

Bulletin of the California Academy of Sciences 2:150. 1886
USDA, ARS, Germplasm Resources Information Network. Galium buxifolium in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: box bedstraw, island bedstraw

Galium buxifolium is a rare species of flowering plant in the coffee family known by the common names box bedstraw and island bedstraw. It is endemic to the Channel Islands of California, where it is known from about 26 populations on two of the islands.[1] It is a federally listed endangered species of the United States.

This is a small shrub reaching one half to 1.2 meters in maximum height. It has leathery rounded leaves in whorls of four about its stems and white flowers. The floral biology of the plant is unusual. It is generally dioecious, but it may have unisexual and bisexual flowers on one plant, or all female or all bisexual flowers on a single plant.[1] It can reproduce sexually or vegetatively by sprouting new plants from its root crown.[1] The fruit is a hairy nutlet.

This plant can be found on Santa Cruz and San Miguel Islands off Southern California coast. Surveys done after the plant was put on the endangered species list succeeded in locating new populations on the former. Parts of San Miguel Island are steep and rocky and there may be populations existing in inaccessible areas there.[1] Many populations are small, containing just a few individuals.[1] The plant once occurred on Santa Rosa Island, which is situated between Santa Cruz and San Miguel Islands, but specimens have not been collected there since 1930.[2]

Threats to the species include invasive plant species, particularly plants that form thick groundcover, such as ice plant (Carpobrotus chilensis) and vinca (Vinca major).[1] Vinca has been experimentally controlled by hand-pulling and herbicide treatments.[2]

USFWS. Galium buxifolium Five-year Review. October 2009.
USFWS, NPS, TNC, USGS, et al. Vinca major control in an endangered plant population on Santa Cruz Island.

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