Erigeron subtrinervis
(Three-nerve Fleabane)
Erigeron subtrinervis, Wellington Ditch Trail, Great Sand Dunes NP, Alamosa Co. 9275
Erigeron subtrinervis, Wellington Ditch Trail, Great Sand Dunes NP, Alamosa Co. 9268
Erigeron subtrinervis, Wellington Ditch Trail, Great Sand Dunes NP, Alamosa Co. 9262
Erigeron subtrinervis, Wellington Ditch Trail, Great Sand Dunes NP, Alamosa Co. 9260
| Scientific Name | Erigeron subtrinervis | USDA PLANTS Symbol | ERSU2 |
| Common Name | Three-nerve Fleabane | ITIS Taxonomic Serial No. | 35953 |
| Family | Asteraceae (Sunflower) | SEINet Reference |
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| Description |
Life zones and habitat: Foothills to alpine (6000 to 12500 ft.); moderately dry soils in meadows, woodland openings, roadsides. Plant: Perennial, leafy clustered stems 6 to 32 inches tall; foliage with spreading hairs. Leaves: Basal leaves withered by blooming; stem leaves oblanceolate to oblong or ovate, 1-5/8 to 5-1/8 inches long and up to 3/4-inch wide; upper leaves are clasping; hairy faces and ciliate margins. Inflorescence: Corymbiform arrays of 1 to 6 composite flower heads up to 1-3/4 inch across each with many (100 to 150) blue to lavender rays becoming slighty curved at the tips; many yellow disk florets; involucre with unequal, glandular-hairy phyllaries in 2 to 3 layers. Bloom Period: June to September. Reference: "Flora of Colorado" by Jennifer Ackerfield, Flora of North America and SW Colorado Wildflowers. Note: Very similar to E. speciosus except that E. subtrinervis is overall much hairier. |
BONAP Distribution Map
Map Color Key |
Colorado Status: Native |
© Tom Lebsack 2025
Banner photo: Castilleja rhexifolia and a brewing storm over the San Juan Mountains
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