H. petiolaris

H. petiolaris may refer to:
 * Hakea petiolaris, the sea-urchin hakea, a shrub or small tree species endemic to the south-west of Western Australia
 * Helianthus petiolaris, the prairie sunflower, a plant species in the genus Helianthus
 * Hydrangea petiolaris, a species native to the woodlands of Japan, Korea and Sakhalin in easternmost Siberia
 * Hylaeorchis petiolaris, a synonym of Maxillaria petiolaris