Shrubby plant 1-2 m tall with erect, sparsely branched stems. Leaves to about 30 cm long, ovate to elliptic, glossy, leathery, slightly blistered and with sunken veins. Flower clusters distinctly 4-sided and in 1s or 3s, each to about 20 cm long, the flowers a bright canary yellow.
Brazil
4-sided, dense, colourful flower spikes.
The scarlet-flowered, straggling A. tetragona from the W Indies and northern South America is less frequently grown.
Source: (2002). Acanthaceae. In: . Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.
Aphelandra squarrosa 'Louisae'
Has leaves with white veins.