[Avens: The Genus Geum West of the Cascade Mountains of Oregon and Washington]

Large-leaf Avens, Large-leaved Avens, Bigleaf Avens

Geum macrophyllum var. macrophyllum

Flower of Large-leaf Avens, Large-leaved Avens, Bigleaf Avens: Geum macrophyllum var. macrophyllum

A close-up view of the flower of large-leaved avens as seen in Gresham, OR.........April 5, 2009.

Characteristics:

Large-leaf avens is a perennial with several basal leaves in a rosette and erect or ascending stems with several leaflets. The stems may rise from 30-70 cm in height. The leaves are compound pinnate or cleft into the middle vein with 9-23 irregularly shaped leaflets or lobes, the largest being the terminal one. The basal leaves may be as much as 30 cm long and the margins are toothed. 2-5 leaves may be found on the stems. These are compound ternate (3 leaflets) with irregularly toothed margins.

The inflorescence is an asymmetrical cyme of several flowers. The 5 green sepals are reflexed downward, each approximately 4-5 mm long. The 5 petals are a medium yellow (not shiny as with buttercups)and 4-6 mm long. The green, maturing fruits look like rounded pincushions with many "pins" poking out.


Habitat:

Large-leaf avens is found in moist woods or meadows, or along streams from the sea level to subalpine habitats.


Range:

Large-leaf avens may be found from Alaska south to Baja California and Mexico, and east in Canada to Nova Scotia.


Sideview of the flower of Large-leaf Avens, Large-leaved Avens, Bigleaf Avens: Geum macrophyllum var. macrophyllum - Basal leaf of Large-leaf Avens, Large-leaved Avens, Bigleaf Avens: Geum macrophyllum var. macrophyllum

A close-up sideview of the flower (left) of large-leaved avens as seen in Gresham, OR..........April 5, 2009. Note the reflexed sepals. The photo at right shows a basal leaf with the rounded terminal leaf which is only shallowly lobed if that. Photographed along the Neahkanie Mountain South Trail, northwestern Tillamook County...........April 6, 2016.

Paul Slichter