

Butler's Sandparsley Ammoselinum butleri
Butler's Sandparsley is an annual wildflower native to the lower 48 states.
More about this plant
Ammoselinum butleria, commonly called the Butler's sandparsley, is a species of flowering plant in the carrot family (Apiaceae). It is native to North America, where it is found primarily in the South Central United States. It is most often found in disturbed sandy areas, including lawns. Its range has expanded eastward in recent times, leading some authorities to consider populations east of the Mississippi River to be non-native. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 7 derived from its U.S. range
- Lifespan
- Annual
How we know this (1) 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.
Sources for this entry (12) Open & cited
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