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Skaneateles Conservation Area/Invasive species/Rubus

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Rubus caesius (European Dewberry)

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European Dewberry (Rubus caesius) has not been widely reported in North America. In fact the Invasive Plant Atlas of the United States shows it present in only two counties (based on iMapInvasives observations): Green County, WI (2) and Onondaga County, NY (2).[1]

The first vouchered Rubus caesius specimen in New York was collected in Tioga county in 1923, and resides at Baily Hortoreum along with specimens collected in Madison County in 2017. The first Onondaga County specimen was collected in 1951 and is in the Vascular Plant Herbarium at the State Museum, where there is also specimen from Yates County collected in 1973.[2]

New York Counties where "research grade" iNaturalist observations of Rubus caesius have been made are Cayuga, Onondaga, and Ontario.[3]

  1. ↑ Invasive Plant Atlas of the United States: European dewberry, Rubus caesius L. accessed 20 Aug 2021.
  2. ↑ Troy Weldy, David Werier & Andrew Nelson (2021). "Rubus caesius (Eurasian dewberry)." New York Flora Atlas. New York Flora Association, Albany, New York.
  3. ↑ Rubus caesius (European Dewberry). iNaturalist taxon map. Aug. 2021

Invasiveness ranking for Rubus caesius (European Dewberry)

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The NYNHP Rank for Rubus caesius is High (Ecological) and Equal outcome (Socio-economic).[1] The New York State Invasive Species Tier for Rubus caesius in the FL-PRISM is 3

As of August 2021, an invasiveness ranking for Rubus caesius had not been included in the published Non-Native Plant Assessments for New York State,[2] nor is it regulated by New York State law.[3]

The Invasive Species Policy Committee of Cornell Botanic Gardens (previously Cornell Plantations), in their Policy on the use of Non-Native Plants In Cornell Botanic Gardens’ Accessioned Collections, includes Rubus caesius in their list of "Plant species that are considered moderately to highly invasive to natural areas in the central Finger Lakes region."[4]

The Finger Lakes Native Plant Society also places Rubus caesius on its "Level 2 (moderately bad)" Invasive Plants list for the Cayuga Lake basin as determined by Cornell field botanist F. Robert Wesley. [5]

The Capitol Region PRISM (Partnership for Regional Invasive Species Management) has placed Rubus caesius on its Tier 1 (Early Detection/Prevention) list of Invasive Terrestrial Plants.[6] The Finger Lakes PRISM places in Tier 3, while New York State places it in Tier 4. The state now ranks it as Highly Invasive.[7]

  1. ↑ New York State Invasive Species Tiers
  2. ↑ New York Invasive Species (IS) Information (NYIS.info) 2021
  3. ↑ New York Codes, Rules and Regulations, Title 6 Section 575.4 - Regulated invasive species
  4. ↑ Cornell Botanic Gardens Invasive Species Policy Committee (2018). "Appendix 3. Plant species that are considered moderately to highly invasive to natural areas in the central Finger Lakes region."
  5. ↑ Finger Lakes Native Plant Society, Invasive Plants, Level 2.Invasive Species of Tompkins County, New York. Accessed 20 Aug. 2021
  6. ↑ Capitol Region PRISM: Invasive Terrestrial Plants. Accessed 20 Aug. 2021
  7. ↑ Rubus caesius in New York State Invasive Species Tiers. 21 Aug. 2021.

Observations of Rubus caesius (European Dewberry) at the SCA

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The following photographs and corresponding iNaturalist observations of Rubus caesius were made at or very near the Skaneateles Conservation Area. Click on images to enlarge and read details on Wikimedia Commons or on the "iNat obs" links to view the corresponding observations at iNaturalist.

Lateral leaflets often have large shallow proximal lobes, giving them a "mitten" shape.
Young primocanes are glaucus.
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