Helianthella uniflora, or oneflower helianthella, is a North American plant species in the sunflower family. It grows in the western United States and western Canada. It has been found from British Columbia south as far as northern Arizona and northern New Mexico.Helianthella uniflora is a herbaceous plant up to 120 cm (3.9 ft) tall. Leaves are up to 25 cm (9.8 in) long, each with 3 prominent veins running the length of the leaf. The plant usually produces only one yellow flower head per stem, though ...
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