From the Great Basin to the Rocky Mountains
Meadows, moist woodland, especially aspen; from 4,500 to 11,800 feet
Stalked, entire, narrowly lanceolate to ovate, up to 20 inches long, with 3 or 5 veins; mostly basal
The common name of helianthella quinquenervis, fivenerve sunflower, refers to the leaves, which have a midvein and two (or one) pairs of lateral veins, branching from the center. Leaves are usually hairless. Leaves are longest around the midpoint of the stem, and all leaves are widest at the middle, rather than above the middle.
The large flowerheads, up to four inches across, are attached by hairy pedicels, and are usually held at 90 degrees from the stem. Phyllaries are dark green, relatively broad, with hairless faces and ciliate margins, and all are approximately equal in size. The bright yellow ray florets usually number 21, less often 13. Disc florets are yellow.