Lathyrus japonicusWilld.

seaside pea

WFO wfo-0000213813 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Lathyrus japonicus, photographed by Jais Knudsen
fig. a Jais Knudsen, CC BY 4.0 / 2022-06-12 / obs. 205447932
Lathyrus japonicus, photographed by Alexandria 'Alex' Wenninger
fig. b Alexandria 'Alex' Wenninger, CC BY 4.0 / obs. 205937331
Lathyrus japonicus, photographed by Maria
fig. c Maria, CC BY 4.0 / obs. 205229906
Lathyrus japonicus, photographed by Alexis Godin
fig. d Alexis Godin, CC BY 4.0 / obs. 204901038
Lathyrus japonicus, photographed by Carolyn Prentice
fig. e Carolyn Prentice, CC0 1.0 / obs. 205538505
Lathyrus japonicus, photographed by Annie Weissman
fig. f Annie Weissman, CC BY 4.0 / obs. 205333020
Lathyrus japonicus, photographed by Alexis Godin
fig. g Alexis Godin, CC BY 4.0 / obs. 204707874
Lathyrus japonicus, photographed by Allan Harris
fig. h Allan Harris, CC0 1.0 / obs. 204466690

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.

Flowering n = 1,727 observations

Peak flowering in Jun, from 1,727 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 48 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.

  • Lathyrus aleuticus (Greene) Pobed.
  • Lathyrus californicus Douglas
  • Lathyrus hultenii J.Rousseau & Raymond
  • Lathyrus japonicus f. acutifolius (Bab.) Fernald
  • Lathyrus japonicus f. albescens (Makino) H.Ohashi & Tateishi
  • Lathyrus japonicus f. albiflorus Tatew.
  • Lathyrus japonicus f. albinus Fernald
  • Lathyrus japonicus f. candidus Fernald
  • Lathyrus japonicus f. japonicus
  • Lathyrus japonicus f. pubescens (Hartm.) H.Ohashi & Tateishi
  • Lathyrus japonicus f. spectabilis Fassett
  • Lathyrus japonicus subsp. japonicus
  • Lathyrus japonicus subsp. maritimus (Bigelow) P.W.Ball
  • Lathyrus japonicus subsp. pubescens Korobkov
  • Lathyrus japonicus var. acutifolius (Bab.) Bässler
  • Lathyrus japonicus var. albescens (Makino) Honda
  • Lathyrus japonicus var. aleuticus (Greene) Fernald
  • Lathyrus japonicus var. glaber (Ser.) Fernald
  • Lathyrus japonicus var. pilosiusculus Pobed.
  • Lathyrus japonicus var. pubescens (Hartm.) Karlsson
  • Lathyrus japonicus var. typicus Fernald
  • Lathyrus maritimus Bigelow
  • Lathyrus maritimus (L.) Fr.
  • Lathyrus maritimus f. albescens (Makino) Hiyama

and 24 more.

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.