Plagiobothrys strictus

Classification System: APG IV

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

Familia: Boraginaceae
Subfamilia: Boraginoideae
Tribus: Cynoglosseae
Subtribus: Amsinckiinae
Genus: Plagiobothrys
Species: Plagiobothrys strictus
Name

Plagiobothrys strictus (Greene) I.M.Johnst.
References

Contributions from the Gray Herbarium of Harvard University. Cambridge, MA 68:78. 1923
USDA, ARS, Germplasm Resources Information Network. Plagiobothrys strictus in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Plagiobothrys strictus is a rare species of flowering plant in the borage family known by the common name Calistoga popcornflower. It is endemic to Napa County, California, where it is known from only two small locations near Calistoga.

Description

This is an annual herb growing erect 10 to 40 centimeters tall. It is mostly hairless except for the sepals, which have some rough hairs. The leaves are located along the stem and measure 4 to 9 centimeters long. The inflorescence is made up of paired branches bearing several five-lobed white flowers each about half a centimeter wide. The fruit is a ribbed nutlet 1 or 2 millimeters long.
Distribution and habitat

It grows in wet grassy habitat kept moist by runoff from hot springs and pools. The combined area of land containing the two populations was estimated to be less than 80 square meters in 1990.[1] The species is threatened by the disturbance of its grassland habitat; both populations are on privately owned, unprotected land, one next to a small airport.[1]
Endangered status

Plagiobothrys strictus is a federally listed endangered species of the United States.
References

USFWS. Endangered and threatened wildlife and plants; Determination of endangered status for nine plants from the grasslands or mesic areas of the Central Coast of California. Federal Register October 22, 1997.