Single Record
Participant Info
- Species
- Dieteria canescens [Machaeranthera canescens] [Machaeranthera viscosa] [Machaeranthera linearis] [Aster canescens] etc.
- Family
- Asteraceae
- CommonName
- hoary false tansyaster, sand daisy
- Presence
- YES
- Status
- native
- EarliestDate
- 1930
- LatestDate
- 2024
- Ecosystem
- basin, shrubland, foothill, montane, ruderal, urban
- Geobotanical
- SSawatch, Garitas, SSanjuans, NCristos, UBasin, LBasin
- Counties
- Alamosa, Conejos, Costilla, Hinsdale, Mineral, Rio Grande, Saguache
- Passes
- La Veta, Medano
- WildlifePreserves
- Baca, Great Sand Dunes, Russell Lakes
- Other Localities
- Alamosa (town), Del Norte
- PhotoRecords
- YES Rich Haswell: Saguache Co, Russell Lakes SWA 7 Aug 2018; Rio Grande Co, Del Norte street side, 9 Oct 2024
- Comments
- Dieteria canescens is generally found at lower elevations than D. bigelovii, but in the Watershed the distributions do overlap. In the Watershed the two species often hybridize, making determination inconclusive with some specimens. The most reliable key character is width of largest stem leaf: D. canescens 5 mm or less, D. bigelovii 5 mm or more. Another useful trait is presence of stipulate-glandular hairs on the peduncle with D. bigelovii and lack of them with D. canescens. But these distinctions do not always hold. (For a valuable exploration of the differences, see A. Schneider, 2001-current.) D. canescens is abundantly variable. POWO recognizes four varieties in Colorado: ambigua, canescens, aristata, and glabra. The last three have been recorded from the Watershed (as well as from New Mexico). In the Watershed, the species is present on both sides of the Valley, from the Basin up into the montane. It is found in every USA state west of the Great Plains, and follows the Rio Grande drainage through New Mexico to far west Texas.
- Annotation