Arctostaphylos hookeri (Hooker's manzanita)

Plate 1 figs. a–h · 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.

Arctostaphylos hookeri, photographed by Henrik Kibak — fig. a Henrik Kibak, CC BY 4.0 / 2022-05-07 / obs. 196096412

Arctostaphylos hookeri, photographed by Annabelle McCarthy — fig. d Annabelle McCarthy, CC BY 4.0 / obs. 186608226

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

Native distribution of Arctostaphylos hookeri, 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.

Region	TDWG code	Continent
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.

Flowering 84 in flower of 161 examined

69%

84%

88%

55%

27%

18%

13%

33%

Proportion of examined Arctostaphylos hookeri in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	9	13	69%	42% to 87%
Feb	36	43	84%	70% to 92%
Mar	23	26	88%	71% to 96%
Apr	6	11	55%	28% to 79%
May	3	11	27%	10% to 57%
Jun	2	11	18%	5% to 48%
Jul	1	8	13%	2% to 47%
Aug	0	6	0%	0% to 39%
Sep	0	9	0%	0% to 30%
Oct	0	7	0%	0% to 35%
Nov	0	4	too few examined
Dec	4	12	33%	14% to 61%

Peak flowering in Mar. Each bar is the share of Arctostaphylos hookeri observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 84 of 161 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. One month has fewer than 5 examined observations, so no proportion is drawn for it. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Where it actually grows measured, from 153 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	5.1 °C	7.1 °C	10.5 °C
Warmest month, mean daily high	16.3 °C	20.7 °C	24.6 °C
Annual rainfall	433 mm	568 mm	800 mm
Rainfall in the driest quarter	5 mm	7 mm	10 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 153 research-grade observations of Arctostaphylos hookeri 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. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

Also published as 12 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

Andromeda venulosa DC.
Arbutus pungens Hook. & Arn.
Arctostaphylos acuta Nutt.
Arctostaphylos hearstiorum Hoover & Roof
Arctostaphylos pungens A.Gray
Arctostaphylos uva-ursi subsp. hookeri (G.Don) Roof
Arctostaphylos uva-ursi var. hearstiorum (Hoover & Roof) Roof
Arctostaphylos uva-ursi var. hookeri (G.Don) Roof
Daphnidostaphylis acuta (Nutt.) Klotzsch
Daphnidostaphylis hookeri (G.Don) Klotzsch
Uva-ursi hookeri (G.Don) Abrams
Xerobotrys venulosus (DC.) Nutt.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
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.