Rough Bellflower Campanula scabrella
Rough Bellflower is a perennial wildflower native to the lower 48 states. It blooms Jul – Sep. A host for pollen-specialist native bees.
More about this plant
Campanula scabrella is a species of bellflower known by the common name rough bellflower. It is native to the mountains of the western United States, where it grows in talus and other rocky alpine habitat. This is a tough perennial herb growing in a clump from a woody rhizome and rarely exceeding 5 centimeters in height. The stiff leaves are linear to narrowly oval in shape and about 3 centimeters long, borne on winged petioles. The leaves are covered with very short appressed pale hairs. The small funnel-shaped flower is just under a centimeter long and pale blue or lavender in color, arising from the leaf clump on an erect pedicel about a centimeter tall. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 6 derived from its U.S. range
- Lifespan
- Perennial
- Flower colour
- Blue AI AI image-analysis of community-science photos (~87% expert agreement) — not a botanical record
Wildlife & pollinators
How pollinator value is scored →✦ Bees specialist-bee host
Specialist native bees depend on it.
Some native bees are pollen specialists (oligolectic) — they raise young only on pollen from particular plant genera. Campanula is a recorded specialist-bee host, so losing it can mean losing the bee that relies on it.
Related plants
More Campanula →
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 (14) 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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