Southwestern Pricklypoppy Argemone pleiacantha
Southwestern Pricklypoppy is a perennial wildflower native to the lower 48 states. It grows to 0.6 ft and blooms Apr – Sep. A host for pollen-specialist native bees.
More about this plant
Argemone pleiacantha is a species of flowering plant in the poppy family known by the common name southwestern prickly poppy. It is native to Arizona and New Mexico in the United States and Chihuahua, and Sonora in Mexico, where it occurs in dry woodlands and slopes of foothills and mountains. It is an annual or perennial herb with branching, erect stems up to 1.5 meters tall. The plant is covered in prickles, often densely. The blue-green leaves are divided into sharp, toothlike lobes. The flower buds are up to 2 centimeters long and covered in prickles. They bloom into showy white-petalled flowers which may be up to 16 centimeters wide. The fruit is a capsule up to 4.5 centimeters long which is covered in prickles. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 8 derived from its U.S. range
- Height
- 0.6 ft
- Lifespan
- Perennial
- Foliage
- Broadleaf
- 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 ~1 caterpillar species
Argemone supports ~1 caterpillar species.
Native butterfly & moth caterpillars are the base of the terrestrial food web — most songbirds rear their young almost entirely on them. As a host for native Lepidoptera this is a modest genus.
Recorded feeding on Argemone in North America, including:
✦ Bees specialist-bee host · 23 bee visitors
Specialist native bees depend on it.
Some native bees are pollen specialists (oligolectic) — they raise young only on pollen from particular plant genera. Argemone is a recorded specialist-bee host, so losing it can mean losing the bee that relies on it.
23 native & managed bee species are documented visiting Southwestern Pricklypoppy — the 12 most-recorded:
Wildlife & visitors 1 bird
Open records of who else uses Southwestern Pricklypoppy — a generalist food-web signal, kept separate from the keystone Ecological Value.
Recorded eaten by 1 bird species (fruit, seed, browse):
Related plants
More Argemone →
How we know this (3) Methods & honest limits
A recorded categorical fact: each species is tagged C3 (standard), C4 (heat/water-efficient) or CAM (succulent, night-time CO₂ uptake) — or a facultative combination. We only show a trait card for the noteworthy C4/CAM cases; C3 is the unremarkable majority, kept in the data but not surfaced as a card.
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 (24) 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).
Loading…
BibTeX
Loading…