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Helianthellas, or little sunflowers, are taprooted, leafy-stemmed perennial herbs with leaves simple and entire, at least the lower opposite.
The flowerheads have large, yellow rays. The involucral bracts are more or less herbaceous, in several series, almost equal or overlapping, or the outer ones enlarged. The receptacle is flat or convex, chaffy throughout, its bracts clasping the achenes. There are numerous disk flowers. The achenes are strongly compressed at right angles to the involucral bracts, and are thin-edged. The persistent pappus consists of several partly joined, fringed, short scales, and commonly 2 slender bristles.
The genus has 8 species, restricted to western N. America.
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Guide to Identify Presented Species of Genus Helianthella
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LEAVES 5-NERVED, INVOLUCRAL BRACTS LANCEOLATE
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H. quinquenervis - Five-nerved Little Sunflower
Stems leafy, several from a branching base, 50-150 cm tall. Mountain meadows.
Flowerheads few, yellow with 13-21 rays 2.5-4 cm long. The bracts lanceolate.
Leaves entire, broadly lanceolate, the upper alternate, lower opposite, 5-nerved.
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LEAVES 3-NERVED, INVOLUCRAL BRACTS LINEAR
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H. uniflora - One-flowered Little Sunflower
Stems leafy, several from a branching base, 20-100 cm tall. Mountain meadows.
Flowerheads solitary, yellow with about 13 rays 2-4.5 cm long. The bracts linear.
Leaves entire, broadly lanceolate, the upper alternate, lower opposite, 3-nerved.
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