In outline they may be broad, narrow, lanceolate, triangular, etc.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
Stamens 5, inserted in the throat, anthers lanceolate.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
Leaves opposite, cordate base, lanceolate-ovate, entire, glabrous.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera