familyFabaceae
subfamilyFabaceae subfam. Faboideae
genusTrifolium
speciesTrifolium eriocephalum
subspeciesTrifolium eriocephalum subsp. arcuatum
Trifolium eriocephalum subsp. arcuatum
Canad. J. Bot. 49: 400. 1971.
Common names: Arched clover
Endemic
Basionym: Trifolium arcuatum Piper Bull. Torrey Bot. Club 28: 39. 1901
Synonyms: T. eriocephalum var. piperi J. S. Martin
Treatment appears in FNA Volume 11.
Herbs sparsely hairy or glabrous; roots fusiform-tuberous, not rhizomelike, except by burial of crown. Leaflet blades of basal leaves obovate, of median leaves broadly lanceolate, apex rounded to retuse, surfaces sparsely hairy or glabrous adaxially. Inflorescences significantly overtopping distal leaves, 2.5 cm diam. Flowers: calyx lobes usually purple, contorted, abaxial lobes longer, lateral lobes 1–1.5 times tube; corolla white, cream, or purple; ovules 3 or 4. 2n = 16.
Phenology: Flowering May–Jul.
Habitat: Open pine forests, riverbanks, clearings, wet meadows.
Elevation: 300–2000 m.
Distribution
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Idaho, Mont., Oreg., Wash.
Discussion
Subspecies arcuatum ranges from west-central Montana through north-central Idaho to northeastern Oregon and southeastern Washington.
Selected References
None.
Lower Taxa
None.