Cordylanthus nidulariusJ.T.Howell

Mt. Diablo bird's-beak

WFO wfo-0000621160 Accepted WFO 2026-06 8 photographs CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Cordylanthus nidularius, photographed by Arvel Hernandez
fig. a Arvel Hernandez, CC BY-SA 4.0 / 2021-05-28 / obs. 133266426
Cordylanthus nidularius, photographed by Arvel Hernandez
fig. b Arvel Hernandez, CC BY-SA 4.0 / obs. 132496996
Cordylanthus nidularius, photographed by Arvel Hernandez
fig. c Arvel Hernandez, CC BY-SA 4.0 / obs. 132496956
Cordylanthus nidularius, photographed by Arvel Hernandez
fig. d Arvel Hernandez, CC BY-SA 4.0 / obs. 133266603
Cordylanthus nidularius, photographed by Ken-ichi Ueda
fig. e Ken-ichi Ueda, CC BY 4.0 / obs. 45394477
Cordylanthus nidularius, photographed by Ken-ichi Ueda
fig. f Ken-ichi Ueda, CC BY 4.0 / obs. 7789819
Cordylanthus nidularius, photographed by Ken-ichi Ueda
fig. g Ken-ichi Ueda, CC BY 4.0 / obs. 4106095
Cordylanthus nidularius, photographed by Ken-ichi Ueda
fig. h Ken-ichi Ueda, CC BY 4.0 / obs. 77159210

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 Cordylanthus nidularius is native: California California
Native distribution of Cordylanthus nidularius, 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 59 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low 3.1 °C 4.0 °C 4.7 °C
Warmest month, mean daily high 28.3 °C 29.0 °C 29.4 °C
Annual rainfall 448 mm 533 mm 560 mm
Rainfall in the driest quarter 4 mm 5 mm 5 mm

It is found where winters are cool but frost is light or absent. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 59 research-grade observations of Cordylanthus nidularius 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.