Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Brian E. Dickerson; Cheryl Mayer; Justin Ramsey; Zach Mergen; Mark Gabel
    Date: 2016
    Source: Journal of the Botanical Research Institute of Texas. 10(2): 541-546.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (219.0 KB)

    Description

    Hieracium spp. (Asteraceae) are noted for their taxonomic complexity, frequent incidence of apomixis and polyploidy, and invasive tendencies. Here we report the Eurasian taxa, Hieracium caespitosum Dumort. and Hieracium piloselloides Vill., as recent additions to the flora of South Dakota. Plants were collected at three locations in the Black Hills during 2014 and 2015 and compared to specimens of H. caespitosum and H. piloselloides at major herbaria (RM, MO, SDC) for five morphometric traits. We found significant differences (P<0.05) between previously identified specimens of these species for involucre and pappus lengths and stellate leaf hair number; the latter was especially discriminatory in univariate and multivariate analyses and probably the most useful trait for field identification. Hieracium specimens from the Black Hills exhibited morphological characteristics of H. caespitosum and H. piloselloides, suggesting that both species were introduced in the region. These data will assist South Dakota land managers in identification of nascent weedy Hieracium populations and may also be of interest to biologists studying demographic and genetic factors related to weed establishment.

    Publication Notes

    • You may send email to rmrspubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Dickerson, Brian E.; Mayer, Cheryl; Ramsey, Justin; Mergen, Zach; Gabel, Mark. 2016. Hieracium caespitosum and Hieracium piloselloides (Asteraceae) in the Black Hills National Forest: New state records for South Dakota, U.S.A. Journal of the Botanical Research Institute of Texas. 10(2): 541-546.

    Keywords

    Hieracium caespitosum, Hieracium piloselloides, flora, weed establishment

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/53352