Parentucellia viscosa(L.) Caruel

Yellow Glandweed

WFO wfo-0001136916 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Parentucellia viscosa, photographed by sprcrkwild
fig. a sprcrkwild, CC BY 4.0 / 2022-06-10 / obs. 205010389
Parentucellia viscosa, photographed by Arvel Hernandez
fig. b Arvel Hernandez, CC BY 4.0 / obs. 200894828
Parentucellia viscosa, photographed by Ashwin Srinivasan
fig. c Ashwin Srinivasan, CC BY 4.0 / obs. 201929478
Parentucellia viscosa, photographed by Reid Hardin
fig. d Reid Hardin, CC BY 4.0 / obs. 194537398
Parentucellia viscosa, photographed by Michelle W. （鍾偉瑋）
fig. e Michelle W. （鍾偉瑋）, CC BY 4.0 / obs. 194227079
Parentucellia viscosa, photographed by Ben Costamagna
fig. f Ben Costamagna, CC BY 4.0 / obs. 205793904
Parentucellia viscosa, photographed by Quentin Groom
fig. g Quentin Groom, CC0 1.0 / obs. 198076826
Parentucellia viscosa, photographed by Quentin Groom
fig. h Quentin Groom, CC0 1.0 / obs. 195063635

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 = 1,752 observations

Peak flowering in May, from 1,752 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 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.

  • Bartsia maxima Gren. & Godr.
  • Bartsia viscosa L.
  • Bellardia viscosa (L.) Fisch. & C.A.Mey.
  • Eufragia viscosa (L.) Benth.
  • Eufragia viscosa var. suavis Costa
  • Euphrasia linifolia Lam.
  • Euphrasia pratensis Sebast. & Mauri
  • Euphrasia viscidula Dumort.
  • Lasiopera viscosa (L.) Hoffmanns. & Link
  • Rhinanthus maximus Lam.
  • Rhinanthus viscosus (L.) Lam.
  • Trixago viscosa (L.) Rchb.

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.