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Have you seen Cherokee Rose (Rosa laevigata)?
Hawaii Early Detection Network Priority Pest for the Big Island of Hawaii

Cherokee Rose flower
Cherokee rose flower
Image: Forest & Kim Starr
Cherokee rose hip
Heavily armed rose hip
Images (middle, right): Floridata
Shoebutton ardesia fruit
Rose bush with smooth leaves and large thorns

Identification: Cherokee Rose is a fast growing, climbing rose that can grow 10-12 ft (3-3.6 m) tall and produces dramatic 3.54 in (9-10 cm) wide white flowers with yellow stamens. It has pinnate leaflets of 2-3 leaflets. It has smooth and shiny leaves. The fruit, or rose hip, is large (1.52 in or 3.8-5 cm long) and are covered in thorny hairs.
Impacts: This rose is native to China and Southeast Asia. It was brought to the continental United States by early colonists and quickly naturalized throughout the Southeastern United States. It became so prevelant that it was adopted as the "native" state flower of Georgia in 1916. It can overgrow other shrubs and trees and the thorny canes can impede passage. In Hawaii it is naturalized on Lanai, Kauai, and a few locations on the Big Island. Please let someone know if you find it on your island!
Dispersal Mechanism: Cherokee rose reproduces vegetatively (by cuttings or root runners). It is moved around by humans as a garden or horticultural plant.

More information about this pest external link

Cherokee Rose look-alikes:

Blackberry (Rubus argutus):
Blackberry is the most widespread of the non-native raspberry/blackberry in Maui County. Blackberry has five petal WHITE FLOWERS with petals .5-.8 in (13-20 mm) long. The fruits turn BLACK at maturity and are .6-.8 in (1.5-2 cm) long.

Rubus argutus

Blackberry (Rubus argutus)

Last Updated: Monday January 30 2012. If you have any questions about the Hawaii Early Detection Network contact
Funding and support for this project was made possible by the Hawai'i Invasive Species Council, the USDA Forest Service State and Private Forestry assistance, and University of Hawai'i-Pacific Cooperative Studies Unit.