. The Canadian field-naturalist. Natural history; Sciences naturelles. 158 The Canadian Field-Naturalist Vol. 120 Distribution Lotus pinnatus occurs in western North America from Vancouver Island, south to northwest Washing- ton, western Oregon and the Columbia River Gorge, to central California and sporadically eastward to Idaho (Figure 2; Isely 1993; Pojar 1999). In Canada, Lotus pinnatus is known from seven extant populations with- in a small area on the east coast of Vancouver Island near Nanaimo (Donovan 2004*). Habitat The British Columbia populations of L. pinnatus occur within the mois
. The Canadian field-naturalist. Natural history; Sciences naturelles. 158 The Canadian Field-Naturalist Vol. 120 Distribution Lotus pinnatus occurs in western North America from Vancouver Island, south to northwest Washing- ton, western Oregon and the Columbia River Gorge, to central California and sporadically eastward to Idaho (Figure 2; Isely 1993; Pojar 1999). In Canada, Lotus pinnatus is known from seven extant populations with- in a small area on the east coast of Vancouver Island near Nanaimo (Donovan 2004*). Habitat The British Columbia populations of L. pinnatus occur within the moist maritime subzone of the Coast- al Douglas-fir (CDF) biogeoclimatic zone (Meidinger and Pojar 1991) in the Nanaimo Lowlands Ecosection of the Georgia Depression Ecoprovince (Demarchi 1996*). In this region, the Olympic Mountains in Washington State to the south and the Insular Mountains on Vancou- ver Island to the west produce a rain shadow effect resulting in a Mediterranean-type climate with warm, dry summers and mild, wet winters. Most of the rain- fall occurs during the winter months, and limited pre- cipitation and high temperatures during the summer months result in pronounced summer moisture deficits (Meidinger and Pojar 1991). Lotus pinnatus grows in open, springy meadows, along the margins of creeks, or in seepages, where underground water comes to the surface and the plants are in close physical contact with cool, flowing water (H. Roemer, personal communication). In all cases, the soils are shallow (< 15 cm), over gently sloping sand- stone or conglomerate bedrock with abundant mois- ture during the growing and blooming period. Lotus pinnatus is most commonly associated with Yellow Monkey-flower (Mimulus guttatus). Sea Blush (Plec- tritis congesta). White Triteleia {Triteleia hyacinthina). Small-leaved Montia {Montia parvifolia), Scouler's Popcomflower (Plagiobothrys scouleri) and American Speedwell (Veronica beccabunga ssp. americana). Stands of Douglas-fir (Ps
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