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Yellow-Flowering Pea
Lathyrus ochroleucus Hook

Found on the Lolo Trail 16 Jun 1806. (Source)

The yellow-flowering pea is a slender, climbing, perennial herb with loosely clustered yellowish-white pea like flowers in clusters about 1 1/2 inches long, pea-like; petals white to yellowish white; appearing early summer.   The leaves alternate and  are pinnately divided, ovate, with well-developed tendrils, stipules broad, oval, often half as long as leaflets. The fruits have slender pods, about 1 1/2-2 1/2 inches long. It grows open woods, thickets, and clearing in moist plains and foothills from the Yukon down through to Idaho and Montana

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