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Common name: Shaggy horkelia <br /> Family: Rosaceae <br /> Status: ONHDB List 1 (threatened with extinction throughout its range) <br /> Federal: Species of Concern <br /> • State: Candidate <br /> BLM: Bureau sensitive <br /> Geographic Distribution: Restricted to the Willamette Valley and the Umpqua Valley. <br /> Known historically from Benton, Douglas, Lane, Linn, Marion, Polk, and Washington Cos., <br /> but no extant populations are known from the last three counties. Most of the remaining <br /> populations occur in Lane County in the Eugene area. There are 22 extant EOR's in the <br /> ONHP data base, as well as 17 historical collections that probably represent populations that <br /> are no longer extant. Five EOR's are located in West Eugene. None of the existing <br /> populations are especially large. Horkelia congesta ssp. nemorosa Keck, the only other <br /> taxon contained in this species, occurs in SW Oregon and NW California (Keck, 1938). <br /> Habitat Description: Horkelia congesta is restricted to native prairies but grows on a <br /> variety of soils and is found in both upland prairie and wet prairie communities. At some <br /> sites it is associated with open stands of oaks and ponderosa pine. In a few cases, small <br /> populations are found in areas that are subject to disturbance such as mowing (Sand Ridge <br /> Cemetery, Irish Bend School), but these populations are probably marginal without special <br /> management. <br /> Growth Habit: Herbaceous taprooted perennial with a simple to branched caudex, stems <br /> usually one to several, 2-4 (5) dm. tall, pilose- hirsute below, becoming glandular - puberulent <br /> above. <br /> Leaves: Basal leaves several, blades 3 -8 cm. long, pilose- hirsute to silky, pinnately <br /> compound with (5) 7 -13 mostly narrowly oblanceolate or linear - cuneate, leaf segments up to <br /> 2 cm. long, apically 2- to 3- toothed; stipules divided into 2 -3 filiform segments; cauline <br /> leaves several, transitional to the several -lobed bracts. <br /> Flowers: Flowers complete, perigynous, petals cream, 5 -6 mm. long, obovate - flabellate, <br /> slightly retuse, distinctly clawed; pistils mostly 10 -20, styles about equaling stamens; <br /> hypanthium cup- shaped, pilose- hirsute and glandular - puberulent, yellowish, not quite so long <br /> as the greenish - tinged, lanceolate- acute, spreading, 4 -5 mm. calyx lobes. <br /> Fruit: Mature achenes about 2 mm. long; mean seed wt. = 1.043 mg.; seeds / lb. = <br /> 434,890 (Guerrant and Raven 1995). <br /> Seed Germination Rate, Seed Bank Persistence: Guerrant and Raven (1995) studied <br /> methods for germinating seeds of native taxa and feasibility of long term cold storage for 69 <br /> 8 <br />