The Queensland Gardening Pages

Firespike Odontonema strictum Ornamentals for the Texas Gulf Coast (Texas A&M University)

Odontonema strictum - Firespike Cal's Plant of the Week, University of Oklahoma

Odontonema cuspidatum (O. strictum) Firespike. Online Manual of Subtropical Landscaping Plants, Palm Beach Community College, Florida

Short-Day Shrubs for Fall and Winter Color University of Florida (notes on Odontonema strictum)

Odontonema strictum James Cook University

Firespike Odontonema strictum. Flowers of India

Odontonema tubaeforme (Bertol.) Kuntze New South Wales Flora Online

Odontonema strictum syn Justicia coccinea The Florez Nursery blog, NSW