Zinnia grandiflora, Rocky Mountain Zinnia
Scientific Name: Zinnia grandiflora
Common Name: Rocky Mountain Zinnia
Also Called: Great Plains Zinnia, Plains Zinnia, Texas Zinnia (Spanish: Zinia)
Family: Asteraceae, Sunflower Family
Synonyms: (Crassina grandiflora)
Duration: Perennial with rhizomes.
Size: 8 to 12 inches more or less.
Growth Form: Forb/herb, subshrub; low growing with woody base, rounded or flat-topped mound, slender stems with many branches.
Leaves: Leaves opposite; entire, linear, rough with fine sharp coarse hairs.
Flower Color: Bright yellow numerous one inch flowers; long bloom periods, radiate flower heads, ray flowers bright yellow with 3 to 6 florets, numerous disk flowers are red or green; fruit an achene.
Flowering Season: August to September following monsoon rainfall.
Elevation: 2,000 to 5,500 feet.
Habitat Preferences: Dry habitats, slopes, sandy and gravelly areas, grasslands, prairies and calcareous soil.
Recorded Range: In Arizona in the northern half of the state, far east and southeast. In the United States in other southwestern states including CO, KS, NM, OK and TX. Also found northern Mexico.
North America & US County Distribution Map for Zinnia grandiflora.
U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.
Comments: As with other Zinnia’s, Rocky Mountain Zinnia is a popular arid landscape plant in Arizona and the southwest. Zinnia flowers are known to attract insects especially butterflies. Closely related to the white flowered Desert Zinnia, Z. acerosa which sometimes has pale yellow flowers.
Ethno botanical uses for Rocky Mountain Zinnia include throat and nose ailments and for stomachache and heartburn. See full species account from Native American Ethnobotany, University of Michigan, Dearborn.