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Photo: Wild leek leaves

Allium tricoccum Ait.

Wild Leek

Habitat: Rich hardwood forests, usually alluvial. [Hardwood to mixed forest (forest, upland); Forested wetland]

Range: Maine and southeastern Canada west to Minnesota and south to Maryland; further south in the mountains to northern Georgia and Alabama.

Photo: Wild Leek leaves and last year's fruiting stalk

Aids to Identification: A perennial from an onion-like bulb (more slender, however, than a true onion). The leaves arise directly from the bulb, and are long-elliptic, flat, rather fleshy, and shiny green, tapering at the apex to a broad point. They usually measure 10-25 cm long and 2.5-7.0 cm wide. The flowers are on a leafless stalk, forming a spherical umbel. The 6 petals are white, and the fruits are distinctively three-lobed.

Ecological characteristics: Allium tricoccum is a species of rich, usually more southern, bottomland woods, a habitat which is in itself scarce in Maine. Where it does occur, it may be abundant, numbering in the hundreds. Most of the vegetative growth occurs early in the spring, before the overstory leaves appear and block the sunlight, and at this time of year the ground may be thick with Allium tricoccum leaves. Associated plants often include other "rich woods" spring flora: Sanguinaria canadensis, Caulophyllum thalictroides, Dicentra cucullaria, and Claytonia caroliniana.

Photo: Fruit of Wild Leek

Phenology: Leaves appear in early spring (early to mid May in Maine), and usually wither by the time the flowers appear (late June - July). Flowering scapes and fruits sometimes persist into the next spring.

Family: Alliaceae

Synonyms: None noted.

Known Distribution in Maine: This rare plant has been documented from a total of 28 town(s) in the following county(ies): Aroostook, Cumberland, Franklin, Kennebec, Knox, Oxford, Penobscot, Somerset, Waldo, York.

Photo: Wild Leek Flowers

Dates of documented observations are: 1897, 1916, 1924 (2), 1978 (2), 1979 (2), 1983, 1985, 1986 (4), 1988, 1989 (2), 1990 (2), 1992, 1994, 1997 (2), 1998, 1999 (2), 2000, 2001 (2), 2002

Reason(s) for rarity: At northern limit of its range; suitable habitat scarce.

Conservation considerations: Effects of logging are not well known; partial removal of the canopy would be less likely to adversely affect the plant than would complete removal.

Photo: Habitat of Wild Leek, showing leaves on forest floor in early spring