SafePlants

Pear Hawthorn (Crataegus calpodendron)

The pear hawthorn, scientifically known as Crataegus calpodendron, is a species of hawthorn found in eastern North America. It is also known as pear haw. This tree is noted for its potential use as rootstock for pear trees.

Considerations for Pets

• Some sources suggest that Crataegus calpodendron has thorns, although it's also described as "almost thornless."
• The plant produces berries.

Considerations for Children

• Some sources suggest that Crataegus calpodendron has thorns, although it's also described as "almost thornless."
• The plant produces berries.

Taxonomy and Nomenclature

• Scientific Name: Crataegus calpodendron (Ehrh.) Medikus
• Family: Rosaceae (Rose family)
• Synonyms: Crataegus tomentosa.

Distribution and Habitat

• Native to much of eastern North America.
• Grows as a small deciduous tree or multi-stemmed shrub in a variety of habitats.

Morphological Characteristics

• Deciduous tree growing up to 6 meters (approximately 19 feet 8 inches) in height.
• Produces somewhat pear-shaped berries.
• Flowers in June.

Ecological Role

• The plant is a food source for the caterpillars of various moths, including the hawthorn, orchard ermine, pear leaf blister, rhomboid tortrix, light emerald, lackey, vaper, and fruitlet moths.

Interactions with Other Organisms

• Can be affected by cedar-hawthorn rust, a fungal pathogen that can also affect pear, quince, and serviceberry trees.
• Subject to damage by pear slug (Caliroa cerasi) and California pear sawfly (Pristophora abbreviata).

Quirky Facts

• Pear scions can be grafted directly onto hawthorn roots, indicating a close relationship between pears and hawthorns.
• The Pear Hawthorn has been studied to test the compatibility of pear on hawthorn.

Further Information

• USDA NRCS National Plant Data Center