Tetramerium nervosum – Hairy Fournwort

Tetramerium nervosum - Hairy Fournwort, Tetramerium

Tetramerium nervosum - Hairy Fournwort, Tetramerium

Plant Name

Scientific Name: Tetramerium nervosum

Synonym: Tetramerium hispidum

Common Names: Hairy Fournwort, Tetramerium

Plant Characteristics

Duration: Perennial

Growth Habit: Subshrub, Herb/Forb

Arizona Native Status: Native

Habitat: Desert (upper elevation), Upland

Flower Color: Pale yellow, Cream

Flowering Season: Spring, Summer, Fall. This wildflower mainly blooms after the summer monsoon rains.

Height: To 1 foot (30 cm) tall

Description: The flowers emerge from between leafy bracts on hairy, 4-sided flower spikes. The individual flowers are tubular and have an upper lobe with a central violet patch and a yellow base, 2 side lobes, and a folded, projecting lower lobe. The leaves are green, opposite, and lanceolate in shape.


Kingdom: Plantae – Plants
Subkingdom: Tracheobionta – Vascular plants
Superdivision: Spermatophyta – Seed plants
Division: Magnoliophyta – Flowering plants
Class: Magnoliopsida – Dicotyledons
Subclass: Asteridae
Order: Scrophulariales
Family: Acanthaceae – Acanthus family
Genus: Tetramerium Nees – tetramerium
Species: Tetramerium nervosum Nees – hairy fournwort

More About This Plant

Arizona County Distribution Map