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
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