Riddell's Dozedaisy Aphanostephus riddellii
Riddell's Dozedaisy is a perennial shrub native to the lower 48 states. A host for pollen-specialist native bees.
More about this plant
Aphanostephus riddellii is a North American species of flowering plants in the family Asteraceae, with the common name Riddell's lazydaisy. It is native to the southwestern and south-central United States, as well as to the state of Coahuila in northern Mexico. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 8 derived from its U.S. range
- Lifespan
- Perennial
- Flower colour
- White AI AI image-analysis of community-science photos (~87% expert agreement) — not a botanical record
Wildlife & pollinators
How pollinator value is scored →❧ Caterpillar hosts Documented caterpillar host
Recorded feeding on Aphanostephus in North America, including:
✦ Bees specialist-bee host · 1 bee visitor
Specialist native bees depend on it.
Some native bees are pollen specialists (oligolectic) — they raise young only on pollen from particular plant genera. Aphanostephus is a recorded specialist-bee host, so losing it can mean losing the bee that relies on it.
1 native & managed bee species is documented visiting Riddell's Dozedaisy :
Wildlife & visitors 3 nectaring
Open records of who else uses Riddell's Dozedaisy — a generalist food-web signal, kept separate from the keystone Ecological Value.
3 adult butterfly & moth species are recorded nectaring at its flowers:
Related plants
More Aphanostephus →
How we know this (2) Methods & honest limits
We take the plant’s U.S. county range and look up each county’s long-term climate, then summarise: native rainfall = the median annual rainfall across its counties; heat tolerance = the warm end (90th percentile) of average temperature across its range (mirroring how our cold-hardiness floor uses an extreme). Counties + medians blunt the roadside/observer bias that makes point-level climate unreliable. Needs at least five placeable counties.
Honest limits: A realized, sampling-biased niche (where it has been recorded, not its physiological optimum), and county climate is coarse — large Western counties span deserts and mountains. Derived guide, never a measured fact.
McKenzie et al. assigned each species a flower colour with a GPT-4V vision model over iNaturalist photos. We use the confident tier plus a separately-labelled lower-confidence top-up (mostly inconspicuous green/brown flowers), and render it as a small tint — never as an asserted fact, and kept out of the written synopsis.
Honest limits: AI image inference (~87% expert agreement on the confident tier); a decorative, confidence-tiered indicator, not a measured trait.
Sources for this entry (17) Open & cited
Cite this page Open data, please attribute
PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).
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