Calystegia macrostegia(Greene) Brummitt

coast morning glory

WFO wfo-0001297169 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Calystegia macrostegia, photographed by Millie Basden
fig. a Millie Basden, CC BY 4.0 / 2022-04-28 / obs. 191416982
Calystegia macrostegia, photographed by Marc Whitaker
fig. b Marc Whitaker, CC BY 4.0 / obs. 195722417
Calystegia macrostegia, photographed by James Fowler
fig. c James Fowler, CC BY 4.0 / obs. 196960471
Calystegia macrostegia, photographed by Elly Poretsky
fig. d Elly Poretsky, CC BY 4.0 / obs. 187201909
Calystegia macrostegia, photographed by James C. Davis
fig. e James C. Davis, CC BY-SA 4.0 / obs. 185600777
Calystegia macrostegia, photographed by jen
fig. f jen, CC0 1.0 / obs. 198476453
Calystegia macrostegia, photographed by James C. Davis
fig. g James C. Davis, CC BY-SA 4.0 / obs. 185927480
Calystegia macrostegia, photographed by Millie Basden
fig. h Millie Basden, CC BY 4.0 / obs. 185291530

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.

Confused withby our own model

These are not lookalikes we guessed at. Each one is a species our identification model genuinely mistook for this plant, and how many times. The error rate is published.

Flowering n = 1,255 observations

Peak flowering in Apr, from 1,255 community-annotated observations worldwide. This is a global aggregate, not a forecast for your garden: the same species flowers on different dates in different hemispheres, and citizen-science records cluster near cities, at weekends, and in spring. Where a species has fewer than 30 annotated records we do not draw this chart at all.

Also published as 16 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.

  • Calystegia macrostegia subsp. longiloba (Abrams) Brummitt
  • Convolvulus aridus Greene
  • Convolvulus aridus subsp. aridus
  • Convolvulus aridus subsp. intermedius Abrams
  • Convolvulus aridus subsp. longilobus Abrams
  • Convolvulus aridus subsp. tenuifolius Abrams
  • Convolvulus cyclostegius House
  • Convolvulus cyclostegius var. intermedius (Abrams) Hoover
  • Convolvulus greenei House
  • Convolvulus macrostegius Greene
  • Convolvulus occidentalis var. angustissimus A.Gray
  • Convolvulus occidentalis var. cyclostegius (House) Jeps.
  • Convolvulus occidentalis var. macrostegius Munz
  • Volvulus macrostegius Farw.
  • Volvulus occidentalis Farw.
  • Volvulus occidentalis var. angustissimus Farw.

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.

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