Acanthaceae
Hairy fournwort
Tetramerium nervosum
- Family
- Acanthaceae
- Genus
- Tetramerium
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Common names
By language (1)
- English
- Hairy fournwort
Synonyms
- Blechum angustius Nees
- Blechum sternbergii Nees
- Dianthera sonorae S.Watson
- Justicia nemorosa Bertero ex Nees
- Justicia papilionacea Sessé & Moc.
- Tetramerium angustius (Nees) T.F.Daniel
- Tetramerium calderonii Happ
- Tetramerium hirsutum Nees
- Tetramerium hispidum Nees
- Tetramerium hispidum var. greenmanii Happ
- Tetramerium nervosum var. angustifolium Nees
- Tetramerium nervosum var. hispidum Torr.
- Tetramerium ovalifolium Oerst.
- Tetramerium ovatum Oerst.
- Tetramerium polystachyum Nees
- Tetramerium scabrum Torr. ex Happ
- Tetramerium standleyi Hopp
Flowers
- In flower
- March to May, September to January (from 132 flowering iNaturalist observations worldwide)
Characteristics
- Growth habit
- Forb/herb, Subshrub
- Lifespan
- Perennial
- In the US and Canada
- Lower 48 states: native
Photos
FlowerPhoto: Augusto Olmos Mercado, CC0, from iNaturalist 
FlowerPhoto: Ricardo Olivo Rodríguez, CC BY-SA 4.0, from iNaturalist 
FlowerPhoto: Kenzie Anderson-Bell, CC BY 4.0, from iNaturalist 
FlowerPhoto: Ulises Pinedo, CC BY 4.0, from iNaturalist 
Photo: Tyrrhium, CC BY 2.0, from Wikimedia Commons 
Photo: Carlos Domínguez-Rodríguez, CC BY 4.0, from iNaturalist 
Photo: Sinaloa Silvestre, CC0, from iNaturalist 
Photo: Juan Carlos Fonseca Mata, CC BY-SA 4.0, from Wikimedia Commons 
Photo: Carlos Domínguez-Rodríguez, CC BY 4.0, from iNaturalist 
Photo: Alex Abair, CC BY 4.0, from Wikimedia Commons 
Photo: Carlos Domínguez-Rodríguez, CC BY 4.0, from iNaturalist 
Photo: Alex Abair, CC BY 4.0, from Wikimedia Commons
More in Tetramerium
- Tetramerium abditumAcanthaceae
- Tetramerium barlerioidesAcanthaceae
- Tetramerium butterwickianumAcanthaceae
- Tetramerium carranzaeAcanthaceae
- Tetramerium denudatumAcanthaceae
- Tetramerium diffusumAcanthaceae
- Tetramerium emilyanumAcanthaceae
- Tetramerium glandulosumAcanthaceae
- Tetramerium glutinosumAcanthaceae
- Tetramerium guerrerenseAcanthaceae
- Tetramerium langlasseiAcanthaceae
- Tetramerium mcvaughiiAcanthaceae
Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.