Rhynchoglossum azureum(Schltdl.) B.L.Burtt

WFO wfo-0000405081 Accepted WFO 2026-06 8 photographs CC BY / CC BY-SA

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.

Rhynchoglossum azureum, photographed by Oscar Marín
fig. a Oscar Marín, CC BY-SA 4.0 / 2011-04-16 / obs. 29093535
Rhynchoglossum azureum, photographed by Oscar Marín
fig. b Oscar Marín, CC BY-SA 4.0 / obs. 29093541
Rhynchoglossum azureum, photographed by Oscar Marín
fig. c Oscar Marín, CC BY-SA 4.0 / obs. 29093549
Rhynchoglossum azureum, photographed by Oscar Marín
fig. d Oscar Marín, CC BY-SA 4.0 / obs. 29093553
Rhynchoglossum azureum, photographed by Oscar Marín
fig. e Oscar Marín, CC BY-SA 4.0 / obs. 29093556
Rhynchoglossum azureum, photographed by naturalist charlie
fig. f naturalist charlie, CC BY 4.0 / obs. 1742088
Rhynchoglossum azureum, photographed by Oscar Marín
fig. g Oscar Marín, CC BY-SA 4.0 / obs. 29093537
Rhynchoglossum azureum, photographed by Oscar Marín
fig. h Oscar Marín, CC BY-SA 4.0 / obs. 29093547

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 12 botanical countries

Regions where Rhynchoglossum azureum is native: Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Colombia, Costa Rica, Ecuador, Guatemala, Honduras, Panamá, Peru Mexico CentralMexico GulfMexico NortheastMexico SoutheastMexico SouthwestColombiaCosta RicaEcuadorGuatemalaHondurasPanamáPeru
Native distribution of Rhynchoglossum azureum, 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.
RegionTDWG codeContinent
Colombia CLM SOUTHERN AMERICA
Costa Rica COS
Ecuador ECU
Guatemala GUA
Honduras HON
Panamá PAN
Peru PER
Mexico Central MXC NORTHERN AMERICA
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Southeast MXT
Mexico Southwest MXS

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.

Where it actually grows measured, from 31 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low 5.8 °C 11.9 °C 14.9 °C
Warmest month, mean daily high 20.0 °C 22.0 °C 26.4 °C
Annual rainfall 1,625 mm 3,250 mm 4,176 mm
Rainfall in the driest quarter 133 mm 232 mm 643 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 31 research-grade observations of Rhynchoglossum azureum 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.

Also published as 7 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.

  • Glossanthus mexicanus R.Br.
  • Klugia azurea Schltdl.
  • Klugia azurea var. costaricencis Fritsch
  • Klugia grandiflora Fritsch
  • Klugia violacea Fritsch
  • Rhynchoglossum grandiflorum (Fritsch) B.L.Burtt
  • Rhynchoglossum violaceum (Fritsch) B.L.Burtt

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.
  3. 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.