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BLUE MOUNTAIN (WESTERN) PRAIRIE CLOVER Dalea Ornata (Douglas Ex Hook.) Eaton & J

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BLUE MOUNTAIN (WESTERN) PRAIRIE CLOVER Dalea Ornata (Douglas Ex Hook.) Eaton & J BLUE MOUNTAIN (WESTERN) PRAIRIE CLOVER Dalea ornata (Douglas ex Hook.) Eaton & J. Wright Fabaceae – Pea family Corey L. Gucker & Nancy L. Shaw | 2019 ORGANIZATION NOMENCLATURE The scientific name of Blue Mountain prairie clover Names, subtaxa, chromosome number(s), hybridization. is Dalea ornata (Douglas ex Hook.) Eaton & J. Wright. It belongs to the Amorpheae tribe of the Fabaceae family, the legume or pea family (Cane et al. 2012; USDA NRCS 2017). Range, habitat, plant associations, elevation, soils. NRCS Plant Code. DAOR2 (USDA NRCS 2017). Subtaxa. No subspecies or varieties are currently recognized (USDA NRCS 2017). Life form, morphology, distinguishing characteristics, reproduction. Synonyms. Petalostemon ornatus Douglas ex Hook (USDA NRCS 2017). Growth rate, successional status, disturbance ecology, importance to Common Names. Blue Mountain prairie clover, animals/people. western prairie clover, handsome prairie clover, ornate dalea (Barneby 1989; Hickman 1993; Pavek et al. 2012; USDA NRCS 2017). Current or potential uses in restoration. Chromosome Number. Chromosome number is commonly 2n = 14, although 2n = 16 may also occur (Barneby cited in Bhattarai et al. 2010). Seed sourcing, wildland seed collection, seed cleaning, storage, testing and marketing standards. Hybridization. Hybrids were not reported in the literature. Recommendations/guidelines for producing seed. DISTRIBUTION Recommendations/guidelines for producing planting stock. Blue Mountain prairie clover is widespread, though generally infrequent, over a relatively large portion of the Interior West including southeastern Recommendations/guidelines, wildland restoration successes/ Washington, eastern Oregon, northern California, failures. northwestern Nevada, and western Idaho (Barneby 1989; Scheinost et al. 2009b). It occurs in the Columbia Plateau, Blue Mountains, Snake Primary funding sources, chapter reviewers. River Plain, and in the Northern Basin and Range ecoregions (Lambert 2005). Habitat and Plant Associations. Dry rocky Bibliography. or sandy sites in sagebrush (Artemisia spp.) and pinyon-juniper (Pinus-Juniperus spp.) communities where average annual precipitation is 12 inches or more (≥305 mm) are typical Blue Select tools, papers, and manuals cited. Mountain prairie clover habitats. (Fig. 1) (Lambert Dalea ornata (Douglas ex Hook.) Eaton & J. Wright Dalea ornata (Douglas ex Hook.) Eaton & J. Wright 1 2005; Ogle et al. 2011; Cane et al. 2012; Pavek et al. 2009a) with the terminal leaflet being the al. 2012). Habitats also include river terraces, lake largest (Barneby 1977). shores, washes, and sandy plains (Barneby 1989). Elevation. Blue Mountain prairie clover occurs at low to moderate elevations from 330 to 6,000 feet (100-1,830 m) (Barneby 1977; Pavek et al. 2012). Seed collections made by the BLM SOS project occurred over an elevation range of 2,223-3,950 feet (678-1,204 m) in Oregon (USDI BLM SOS 2017). Soils. Soft clay and sandy soils from weathered basalt and volcanic ash are typical of Blue Mountain prairie clover habitats (Barneby 1977). Plants often occur on ash outcrops in Idaho and Oregon (DeBolt and Barrash 2013). Figure 2. Blue Mountain prairie clover growing in the Succor Creek area of Oregon. Photo: M. Fisk, USFS. Figure 1. Blue Mountain prairie clover growing in sagebrush habitat in Idaho. Photo: USDI BLM ID931, SOS. DESCRIPTION Blue Mountain prairie clover is a tap-rooted perennial legume with clusters of stout stems 12 to 24 inches (30-61 cm) tall (Fig. 2) (Barneby 1977; Lambert 2005; Pavek et al. 2012). Taproots are brown and tough from a short caudex (Barneby 1977). Plants resemble some clover species (Trifolium spp.) and give off a strong scent when bruised (Barneby 1989). Stems and leaves are glabrous and gland dotted (Barneby 1989; Pavek et al. 2012). Dried stems from the previous year’s growth are often present (Scheinost et al. 2009b). Leaves are alternate and pinnately compound with five or seven, thick, oval leaflets and small stipules (Barneby 1989; Johnson et al. 2011; Cane et Figure 3. Blue Mountain prairie clover beginning to flower. al. 2012; Pavek et al. 2012). Leaves are 1.6 Photo: G.A. Monroe, hosted by the USDA-NRCS PLANTS to 2 inches (4-5 cm) long; individual leaflets Database. are 0.4 to 0.8 inch (1-2 cm) long (Scheinost et 2 Dalea ornata (Douglas ex Hook.) Eaton & J. Wright Inflorescences are dense, congested, cylindrical Seed production of Blue Mountain prairie clover spikes that are generally 0.5 to 0.6 inch (1-2 cm) plants can be prolific. In a USDA Agricultural in diameter. Flowers are perfect and tubular with Research Service (ARS) research garden (Logan, five light pink to purple petals (Fig.3) (Barneby UT), 17 plants averaged 117 spikes each, and each 1989; Hickman 1993; Pavek et al. 2012). One spike averaged 151 flowers (Cane et al. 2012). petal is broadly clawed and attached to the calyx. At 1 seed per flower, estimated average seed The other four petals have narrow claws. They production per plant would be almost 18,000. This alternate with the five stamens and are attached number is slightly lower than the estimated yield to the staminal tube (Barneby 1989; Scheinost et of 22,000 seeds/plant for an equivalent number of al. 2009a; Pavek et al. 2012). Flower petals are 7 flowering spikes reported for purple prairie clover to 9 mm long and come together at the base in (D. purpurea) grown in the same garden (Cane et al. the calyx tube, which is thin and papery with 10 2012). Blue Mountain prairie clover plants grown ribs and long silky hairs (Hickman 1993; Scheinost in two nearby ARS research gardens averaged 36 et al. 2009a). Fruits are indehiscent pods, each 3 spikes (range of 12-82) in sandy, mesic silt loams to 3.5 mm long, that contain a single seed. Fruits and 61 spikes in coarse, mesic silt loams (Bhattarai produce two ovules, but one is aborted (Barneby et al. 2010). Similar numbers of spikes per plant 1977). (25-115) were also reported in a research garden in southeastern Oregon (Love and Cane 2019). Below-Ground Relationships/Interactions. As is common with legumes, Blue Mountain prairie Pollination. Insect pollination is required to clover fixes nitrogen in association with rhizobial maximize seed production (Cane et al. 2012). symbionts (Fig. 4) (Bushman et al. 2015). Pollination of Blue Mountain prairie clover was evaluated for several years at the ARS’ Pollinating Insect-Biology, Management, Systematics Research (ARS PIBMSR). Manually outcrossed flowers produced four times more seed than manually selfed flowers and 10 times more seed than auto-pollinated flowers (caged and without insect contact) (P < 0.05). Hence, the species is largely self-incompatible, requiring cross-pollination between plants for good seed production. Bee visitors were net-collected in wild populations of Blue Mountain prairie clover and Searls’ prairie clover (D. searlsiae) in Elmore County, Idaho; Malheur County, Oregon; and Benton, County, Washington. Researchers collected 114 bees representing 22 species at 847 plants sampled. The most prevalent bee visitors were carder or potter bees (Anthidium spp.), bumblebees (Bombus spp.), long-horned bees (Eucera and Melissodes spp.), and a Figure 4. Root nodules on Dalea roots. Photo: J. Cane, USDA specialist plasterer bee (Colletes spp.) (Cane et Agriculture Research Service (ARS). al. 2012). Another study compared floral guilds of bees across the Great Basin and adjoining regions. Researchers collected 13 bee genera in eight Reproduction. Blue Mountain prairie clover surveys of Blue Mountain prairie clover and Searls’ reproduces from seed. In an agricultural setting, prairie clover, including seven bumblebee species plants flowered and produced seed in their second (Cane and Love 2016). Blue Mountain prairie clover year (Shock et al. 2018). In an outdoor nursery is considered a fire-tolerant species and provides setting, plants flowered in their first growing an important nectar source for recovering bee season (DeBolt and Barrash 2013). Flowering populations by the first or second post-fire year progresses upwards from the base to the tip of the (Love and Cane cited in Shock et al. 2018). inflorescence over a 3- to 4-week period, usually Predation. Seed production can be dramatically beginning in late May or June. Flowers near the reduced by seed-feeding insects. In wildland tip of the inflorescence may just be opening as stands in Washington, Oregon, and Idaho, the lower portion of the inflorescence is maturing tiny seed-feeding beetles (Acanthoscelides seeds (Johnson et al. 2011). oregonensis and Apion amaurum) were found in 14 of 23 Blue Mountain prairie clover stands sampled (Cane et al. 2012). In another survey of Dalea ornata (Douglas ex Hook.) Eaton & J. Wright Dalea ornata (Douglas ex Hook.) Eaton & J. Wright 3 Blue Mountain prairie clover seed predators in Nutritive value. Only small differences in forage sagebrush-steppe in Washington, Idaho, and quality traits were found in 22 accessions Oregon, these seed-feeding beetles were found of Blue Mountain prairie clover (Bhattarai et in 19 of 22 seed collections. Larvae of these al. 2010). Growing-season acid detergent beetles feed within a single seed, then pupate fiber averaged 34% (range: 30-37%), neutral there and later emerge as adults. It is not clear if detergent fiber averaged 43% (range: 39-47%), they winter in the seed or exit the seed in the fall and crude protein averaged 18% (range: 17- and winter underground or in leaf litter (Cane et 19%). This forage quality together with the al. 2013). lack of swainsonine, selenium, or nitrotoxin concentrations that are toxic to livestock makes Blue Mountain prairie clover a good quality forage (Bhattarai et al. 2010; Johnson et al. ECOLOGY 2011). Current medicinal uses. Extracts of Blue Blue Mountain prairie clover is a long-lived Mountain prairie clover reduced the motility and perennial. Stems sprout from crowns in early increased the mortality of human pathogenic spring, and by early July, flowering and seed hookworms (Ancylostoma ceylanicum), which set are generally complete.
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