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3 <br />IV. ST) <br />AND DISTRIBUTION OF THE SPECIES <br />A. Bradshaw's lomatium, Lomatium bradshawii (Rose ex Math.) Math. & Constance <br />Bradshaw's lomatium is a member of the Apiaceae (= Umbelliferae, parsley, carrot, or <br />um el) family. It is a taprooted, herbaceous plant with compact yellow flowers in <br />con ipound 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 />fou id in Hitchcock and Cronquist (1973), Kagan (1980), Meinke (1982), and Brad_ shaw's <br />Lo Latium Recovery Plan (USFWS 1993) (Recovery Plan). <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 />soil 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 ofLaCamas <br />La1Se, 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 />cae pitosa). 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 />I% of these native wet prairies have survived since Euroamerican settlement (Alverson <br />199 ). These areas usually have standing water from October to May. The soils are <br />uni rmly heavy clay with little rock, sand, or gravel present (Kagan 1980). <br />Nat ve 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 />ife History <br />ra shaw's lomatium is an herbaceous plant from a perennial taproot. It reproduces by <br />;ed only, without vegetative spread. Peak blooming period is usually the last week in <br />.pr 1 through the first week in May. A diverse assemblage of insects, especially solitary <br />97 -0040 1 <br />