Redcardinal Erythrina herbacea
Redcardinal is a perennial tree native to the lower 48 states. It grows to 16 ft and blooms Mar – Jun. A keystone plant for native insects and the food web.
More about this plant
Erythrina herbacea, commonly known as the Eastern Coralbean, Cherokee Bean, Mamou in South Louisiana, Red Cardinal, or Cardinal Spear is a flowering shrub or small tree found throughout the southeastern United States and northeastern Mexico; it has also been reported from parts of Central America and, as an introduced species, from Pakistan. Various other systematic names have been used for this plant in the past, including Erythrina arborea, Erythrina hederifolia, Erythrina humilis, Erythrina rubicunda, Corallodendron herbaceum and Xyphanthus hederifolius. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 8 derived from its U.S. range
- Height
- 16 ft
- Lifespan
- Perennial
- Foliage
- Deciduous/evergreen broadleaf
- Flower colour
- Red 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 Erythrina in North America, including:
+ 2 more species → ↑ show fewer
Wildlife & visitors 1 bird · 1 nectaring
Open records of who else uses Redcardinal — a generalist food-web signal, kept separate from the keystone Ecological Value.
Recorded eaten by 1 bird species (fruit, seed, browse):
1 adult butterfly & moth species is recorded nectaring at its flowers:
Across 39 U.S. vegetation-survey plots that recorded Redcardinal, these catalog species turned up most often in the same plot — a real field co-occurrence signal, not a planting prescription.
Related plants
More Erythrina →
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 (23) 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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