Seeds of Erythrina subumbrans or December tree is a deciduous tree with a spreading crown and branches armed with stout prickles. December Tree is a deciduous tree, up to 100 feet tall, with trunk and branches with spines. Bole straight. Bark grey or grey-green, smooth, soft, often with spine on twigs and trunk. Leaves are trifoliolate, with 3-primary basal veins. Leaflets are broadly ovate, pointed, base rounded, margin entire. 3-primary basal veins, secondary and tertiary veins oblique. Flowers are large, pea-flower-shaped, bright scarlet. They are arranged in a many-flowered inflorescence, at branch ends, bisexual, on stalks longer than 1 1/2 inch. Fruit is a flat pod, up to 32 inches long, seeds 1-3 inches. December Tree is found in Burma, South India, Indochina, Malesia, Sri Lanka, Thailand, Laos. Hardy to zones 10-11.