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Thyrsacanthus (Greek, thyrse and flower). Acanthaceae. Erect, glabrous, pubescent or villous herbs, which are adapted to the warmhouse. Lvs. opposite, entire; usually large: fls. red, fascicled at the bract-axils, pedicelled; fascicles or cymes arranged in a terminal thyrsoid, simple raceme or paniculately branched; calyx short, rather 5-parted, segms. narrow, acute or acuminate; corolla-tube elongate, straight or somewhat incurved, limb somewhat 2-lipped, 4-cleft; stamens 2, staminodia 2; disk rather thick: caps. oblong; seeds 4 or fewer by abortion.— About 23 species, Trop. Amer. The oldest and now accepted name of the genus is Odontonema.
Thyrsacanthus (Greek, thyrse and flower). Acanthaceae. Erect, glabrous, pubescent or villous herbs, which are adapted to the warmhouse. Lvs. opposite, entire; usually large: fls. red, fascicled at the bract-axils, pedicelled; fascicles or cymes arranged in a terminal thyrsoid, simple raceme or paniculately branched; calyx short, rather 5-parted, segms. narrow, acute or acuminate; corolla-tube elongate, straight or somewhat incurved, limb somewhat 2-lipped, 4-cleft; stamens 2, staminodia 2; disk rather thick: caps. oblong; seeds 4 or fewer by abortion.— About 23 species, Trop. Amer. The oldest and now accepted name of the genus is Odontonema.
O. callistachyum, Kuntze (Thyrsacanthus callistachyus, Nees. T. lilacinus, Lindl. Justicia lilacina, Hort.). Shrub, 2 ft. high: lvs. oblong, petioled, tomentose: fls. red; sepals pubescent, bristly-acuminate; corolla glabrous. Mex. J.F. 2:165.
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