Collinsia corymbosaHerder

roundhead Chinese houses

WFO wfo-0000614885 Accepted WFO 2026-06 5 photographs CC0 / CC BY

Plate 1 figs. a–e · 2 observations

This species has been photographed under an open licence only 2 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Collinsia corymbosa, photographed by Steve Matson
fig. a Steve Matson, CC BY 4.0 / 2007-04-09 / obs. 159980319
Collinsia corymbosa, photographed by Steve Matson
fig. b Steve Matson, CC BY 4.0 / obs. 159980280
Collinsia corymbosa, photographed by Scott Yarger
fig. c Scott Yarger, CC0 1.0 / obs. 38598760
Collinsia corymbosa, photographed by Scott Yarger
fig. d Scott Yarger, CC0 1.0 / obs. 38598708
Collinsia corymbosa, photographed by Scott Yarger
fig. e Scott Yarger, CC0 1.0 / obs. 38598843

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 1 botanical country

Regions where Collinsia corymbosa is native: California California
Native distribution of Collinsia corymbosa, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
California CAL NORTHERN AMERICA

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Where it actually grows measured, from 33 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low 5.4 °C 7.0 °C 9.1 °C
Warmest month, mean daily high 18.2 °C 22.9 °C 24.9 °C
Annual rainfall 1,254 mm 1,400 mm 1,535 mm
Rainfall in the driest quarter 20 mm 22 mm 25 mm

It is barely found anywhere that freezes. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 33 research-grade observations of Collinsia corymbosa that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.