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Helianthus devernii
Red Rock sunflower is a perennial herb in the daisy family, known from only two desert spring sites in Nevada's Red Rock Canyon. It grows in moist alkaline soil, so it needs wet ground and full sun to thrive.
Helianthus devernii is a North American species of flowering plant in the daisy family Asteraceae, known by the common name Red Rock sunflower. The perennial herbaceous plant is endemic to a portion of Nevada's Red Rock Canyon National Conservation Area measuring less than 1 acre (4,000 m2), where it grows in just two desert spring locations within the Mojave Desert.
The plant reaches up to 102 cm (40 in) in height. Its leaves tend toward the grass-like shape, with a single prominent vein, and alternate up the stem. The flower heads feature 5-8 yellow apparent petals—ray florets—surrounding a larger number of disk florets; the seeds are 3.5–4.0 mm (0.14–0.16 in) long. H. devernii can be distinguished from the closely related Helianthus cusickii by its shorter ray petals and single-veined leaves, and genetic evidence indicates it is most closely related to Helianthus pumilus.
The perennial herb is found within and around a small portion of Red Rock Canyon National Conservation Area in Clark County, Nevada—a BLM-managed National Conservation Area within the Mojave Desert. Helianthus devernii has been found at two desert spring locations with moist alkaline soils. About 38% of the plants are located on BLM lands, 62% of the plants are on adjacent private inholdings.
Southeastern sunflower · Helianthus ambiguus · Swamp sunflower · Common sunflower · Western sunflower · Silverleaf sunflower · Arizona sunflower · Purpledisk sunflower · Serpentine sunflower · Helianthus brevifolius · California sunflower · Lakeside sunflower
Text excerpted from the Wikipedia article Helianthus devernii by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
