Limnanthes is a small genus of annual herbaceous plants in the family Limnanthaceae (order Brassicales), commonly known as meadowfoams. It is the type genus of its family and comprises seven species, all native to western North America — primarily the coastal ranges, inland valleys, foothills, and mountains of California and the Pacific Northwest, where they grow in seasonally wet, marshy habitats such as the margins of vernal pools.
Plants are low-growing to erect, with pinnately lobed or compound leaves whose lobes or leaflets may themselves be entire or deeply cut. Flowers are typically bowl-shaped and borne singly; some species have 4-merous flowers and others have 5-merous flowers, giving the genus an unusual variability in floral formula. The genus is divided into two sections: section Limnanthes, in which the sepals reflex during fruit maturation, and section Inflexae, in which the sepals curve over the maturing fruit.
Limnanthes douglasii, the poached egg plant, is widely grown as a hardy garden annual, its distinctive white petals with bright yellow bases making it a popular cottage-garden subject. Limnanthes alba (white meadowfoam) is of considerable commercial interest: its seeds yield a stable, high-erucic liquid wax used in cosmetics and industrial lubricants, and honey produced by bees that pollinate it has a noted flavor of toasted marshmallows. Several species in the genus are rare or endangered, reflecting their dependence on vulnerable vernal-pool habitats.
Etymology
The name Limnanthes derives from the Greek limne (marsh, pool) and anthos (flower), referring to the marshy, vernal-pool habitats where these plants typically grow.
Distribution
All seven species are native to western North America, occurring in coastal and adjoining regions including inland valleys, foothills, and mountains, primarily in California and the Pacific Northwest. Some species are endemic to California. The plants are characteristically found in seasonally inundated habitats such as vernal pool margins.
Ecology
Limnanthes species are annuals adapted to seasonally wet habitats, particularly the margins of vernal pools and marshy ground that dry out in summer. Limnanthes alba is an important early-season nectar source; honeybees visiting its flowers produce a distinctively flavored honey described as tasting of toasted marshmallows.
Cultivation
Limnanthes douglasii (poached egg plant) is widely cultivated as a hardy annual in temperate gardens. It is valued for its cheerful white-and-yellow flowers and its attractiveness to beneficial insects. Plants self-seed freely in suitable conditions.
