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3 <br /> IV. STATUS AND DISTRIBUTION OF THE SPECIES <br /> A. Bradshaw's lomatium, Lomatium bradshawii (Rose ex Math.) Math. & Constance <br /> Species Description <br /> Bradshaw's lomatium is a member of the Apiaceae (= Umbelliferae, parsley, carrot, or <br /> umbel) family. It is a taprooted, herbaceous plant with compact yellow flowers in <br /> compound umbels. It is found in seasonally wet prairies of the Willamette Valley <br /> (Marion, Benton, Linn, and Lane Counties) and an isolated location in southwest <br /> Washington (Clark County) . More detailed descriptions of Bradshaw's lomatium can be <br /> found in Hitchcock and Cronquist (1973), Kagan (1980), Meinke (1982), and Bradshaw's <br /> Lomatium Recovery Plan (USFWS 1993) (Recovery Plan). <br /> Habitat <br /> Bradshaw's lomatium is endemic to central and southern portions of the Willamette <br /> Valley in western Oregon (USFWS 1993), and near LaCamas Lake, Washington. <br /> Occurrence has been documented in three distinct habitat types: (1) shallow, alluvial <br /> soils near the Santiam River; (2) seasonally saturated or flooded prairies along creeks and <br /> streams in the southern Willamette Valley; and (3) wet prairie in the vicinity of LaCamas <br /> Lake, Washington. Most populations are found in seasonal wet prairie habitat in the <br /> southern Willamette Valley, particularly near Eugene. <br /> Bradshaw's lomatium occurs in wet prairies dominated by tufted - hairgrass (Deschampsia <br /> caespitosa). The tufted - hairgrass community is a tall grass prairie type, typically found in <br /> low, flat, bottomlands of the Willamette Valley (Franklin and Dyrness 1973). Less than <br /> 1% of these native wet prairies have survived since Euroamerican settlement (Alverson <br /> 1994). These areas usually have standing water from October to May. The soils are <br /> uniformly heavy clay with little rock, sand, or gravel present (Kagan 1980). <br /> Native vascular plants associated with this habitat type are listed in Appendix 1. Many <br /> introduced plants are also common in wet prairie habitat. Common introduced species <br /> found at Willow Creek Preserve, a tufted - hairgrass prairie in west Eugene, are also listed <br /> in Appendix 1. <br /> Life History <br /> Bradshaw's lomatium is an herbaceous plant from a perennial taproot. It reproduces by <br /> seed only, without vegetative spread. Peak blooming period is usually the last week in <br /> April through the first week in May. A diverse assemblage of insects, especially solitary <br /> 91 -00401 <br />