Helianthella uniflora

Helianthella uniflora, the oneflower helianthella,^[2] is a North American plant species in the family Asteraceae. 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.^[3][4]

Helianthella uniflora
Conservation status
Secure  (NatureServe)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Tribe:	Heliantheae
Genus:	Helianthella
Species:	H. uniflora
Binomial name
Helianthella uniflora (Nutt.) Torr. & A.Gray 1842
Synonyms[1]
Helianthus uniflorus Nutt. 1834 Leighia uniflora (Nutt.) Nutt. Helianthella douglasii Torr. & A.Gray

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 sometimes 2 or 3, the heads not nodding (hanging). Each head contains 11-21 bright yellow ray flowers surrounding numerous yellow disc flowers.^[5]