Alternanthera philoxeroides(Mart.) Griseb.

Alligatorweed

WFO wfo-0000528743 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Alternanthera philoxeroides, photographed by Joseph Aubert
fig. a Joseph Aubert, CC BY 4.0 / 2022-05-27 / obs. 201257417
Alternanthera philoxeroides, photographed by Joseph Aubert
fig. b Joseph Aubert, CC BY 4.0 / obs. 199835518
Alternanthera philoxeroides, photographed by Rick_Larimore
fig. c Rick_Larimore, CC BY 4.0 / obs. 202018957
Alternanthera philoxeroides, photographed by Zinogre
fig. d Zinogre, CC BY-SA 4.0 / obs. 203448806
Alternanthera philoxeroides, photographed by Joseph Aubert
fig. e Joseph Aubert, CC BY 4.0 / obs. 199831435
Alternanthera philoxeroides, photographed by Zinogre
fig. f Zinogre, CC BY-SA 4.0 / obs. 197487456
Alternanthera philoxeroides, photographed by 胡正恆(Jackson Hu)
fig. g 胡正恆(Jackson Hu), CC BY 4.0 / obs. 198780266
Alternanthera philoxeroides, photographed by Samuel A Schmid, PhD, PWS
fig. h Samuel A Schmid, PhD, PWS, CC BY 4.0 / obs. 196071724

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 = 1,104 observations

Peak flowering in May, from 1,104 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 21 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.

  • Achyranthes paludosa Bunbury
  • Achyranthes philoxeroides (Mart.) Standl.
  • Alternanthera philoxerina Suess.
  • Alternanthera philoxeroides f. acutifolia (Moq.) Pedersen
  • Alternanthera philoxeroides f. angustifolia Suess.
  • Alternanthera philoxeroides var. acutifolia Moq. ex Hicken
  • Alternanthera philoxeroides var. lancifolia Chodat
  • Alternanthera philoxeroides var. luxurians Suess.
  • Alternanthera philoxeroides var. obtusifolia Moq. ex Hicken
  • Alternanthera philoxeroides var. phyllantha R.E.Fr.
  • Alternanthera philoxeroides var. platyphylla (Seub.) R.E.Fr.
  • Bucholzia philoxeroides Mart.
  • Bucholzia philoxeroides var. acutifolia Mart.
  • Bucholzia philoxeroides var. obtusifolia Mart.
  • Celosia amphibia Salzm. ex Moq.
  • Mogiphanes philorexoides D.Parodi
  • Telanthera philoxeroides Moq.
  • Telanthera philoxeroides var. acutifolia Moq.
  • Telanthera philoxeroides var. denticulata Seub.
  • Telanthera philoxeroides var. linearifolia Chodat
  • Telanthera philoxeroides var. obtusifolia Moq.

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.