Wrinkled hackberry (Celtis rugulosa)

Rocky Mountain hackberry
Silhouette: T. Michael Keesey / License

Celtis rugulosa: Wrinkled Hackberry Profile

Amidst the rugged terrain of the Rocky Mountains, where dry winds sculpt the landscape, a resilient deciduous tree has adapted to thrive. Celtis rugulosa stands as a fascinating member of the hackberry group, historically described by botanist Per Axel Rydberg in the early 20th century. Though its taxonomic status has occasionally been debated, it remains an intriguing representative of the wild flora of this region.

Belonging to the Cannabaceae family, this species shares many of the tough, adaptable traits that define its genus. The specific epithet "rugulosa" hints at the distinct texture of its foliage, distinguishing it from related trees. It often grows in rocky soils, canyons, and along stream banks, contributing to the local ecosystem by stabilizing the soil and providing shelter for wildlife.

Taxonomy

  • ∟ царство Plantae
  • ∟ division Tracheophytes (Vascular Plants)
  • ∟ subdivision Spermatophytes (Seed plants)
  • ∟ Angiosperms
  • ∟ mesangiosperms
  • ∟ eudicots
  • ∟ Superrosids
  • ∟ rosids
  • ∟ order Rosales
  • ∟ family Cannabaceae (Hemp family)
  • ∟ genus Celtis (Hackberry)
  • ∟ species Celtis rugulosa (Wrinkled hackberry)

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Morphology

The morphological traits of Celtis rugulosa are typical of the hackberry genus, yet distinguished by specific leaf textures. The leaves are alternate and simple, characterized by a slightly rugose or wrinkled surface, which gives the plant its scientific name. The leaf base is frequently asymmetrical or oblique, a hallmark of the Celtis genus.

Its bark develops a rough, warty, or corky texture as the tree matures, providing a protective layer against environmental stressors. The flowers are small, greenish, and lack petals, typically appearing in the spring alongside the new foliage. Following pollination, the plant produces small, fleshy drupes containing a single hard pit, which change color as they ripen in the autumn.

Flowering season

The tree typically blooms in the mid-to-late spring, producing small, inconspicuous flowers.

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Applications

While Celtis rugulosa is primarily a wild species, trees in the genus Celtis have significant ecological applications. They serve as essential food sources and habitats for regional wildlife, particularly birds that consume their fleshy drupes. Their deep, resilient root systems make them excellent for soil stabilization in erosion-prone rocky landscapes.

Historically, indigenous peoples of the Rocky Mountain regions utilized the sweet, date-like fruits of wild hackberries as a food source, often grinding them into a paste or mixing them with other foods. The wood, though not highly prized in commercial forestry, can be used locally for firewood or small carpentry projects.

Interesting facts

The taxonomy of Celtis rugulosa is closely tied to the extensive work of Per Axel Rydberg, who described many plant species of the Rocky Mountains in 1917. Some modern taxonomic databases list it as a doubtful species or a synonym of other widespread hackberries, highlighting the complex morphological variations within the genus.

  • The specific epithet rugulosa is derived from Latin, meaning "slightly wrinkled," an accurate descriptor of its foliage.
  • The Arabic botanical records reference it as "ميس جعيد" (Wrinkled hackberry) and accurately place it within the Cannabaceae family.
  • Birds are the primary dispersal agents for this tree, consuming the small drupes and distributing the seeds across the rugged terrain.

Geography of distribution

  • United States

Sources

Technical Information

External Databases: GBIF, POWO, Tropicos

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