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3 A. Bradshaw's lomatium, Lomatium bradshawii (Rose ex Math.) Math. & Constance Species Description L. bradshawii is a member of the Apiaceae (= Umbelliferae, parsley, carrot, or umbel) family. It is a taprooted, herbaceous plant with compact yellow flowers in compound umbels. It is found in seasonally wet prairies of the Willamette Valley (Marion, Benton, Linn, and Lane Counties) and an isolated location in southwest Washington (Clark County) . More detailed descriptions of L. bradshawii can be found in Hitchcock and Cronquist (1973), Kagan (1980), Meinke (1982), and Bradshaw's Lomatium Recovery Plan (USFWS 1993) (Recovery Plan). Habitat L. bradshawii is endemic to the central and southern portions of the Willamette Valley in western Oregon (USFWS 1993), and near LaCamas Lake, Washington. Occurrence has been documented in three distinct habitat types: (1) shallow, alluvial soils near the Santiam River; (2) seasonally saturated or flooded prairies along creeks and streams in the southern Willamette Valley; and (3) wet prairie in the vicinity of LaCamas Lake, Washington. Most populations are found in seasonal wet prairie habitat in the southern Willamette Valley, particularly near Eugene. L. bradshawii occurs in the wet rairies dominated by tufted-hair grass (Deschampsia Y sia g ( p caespitosa). The Deschampsia community is a tall grass prairie type, typically found in the low, flat, bottomlands of the Willamette Valley (Franklin and Dyrness 1973). Less that 1% of these native wet prairies have survived since Euroamerican settlement (Alverson 1994). These areas usually have standing water from October to May. The soils are uniformly heavy clay with little rock, sand, or gravel present (Kagan 1980). Native vascular plants associated with this habitat type are listed in Appendix 1. Many introduced plants are also common in the wet prairie habitat. Common introduced species found at Willow Creek Preserve, a Deschampsia caespitosa grassland in west Eugene, are also listed in Appendix 1. Life History Lomatium bradshawii is an herbaceous plant from a perennial taproot. It reproduces by seed only, without vegetative spread. The peak blooming period is usually the last week in April through the first week in May. A diverse assemblage of insects, especially solitary bees and flies, visit the flowers (Kaye 1992, Kaye and Kirkland 1994). The species does not self - pollinate, but depends on these insects for pollen transfer.