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
See also Petiolaris (disambiguation)