Silphium radula (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Silphium radula" in English language version.

refsWebsite

Global rank English rank

438^th place

336^th place

9,082^nd place

5,078^th place

1austincollege.edu

low place

low place

732^nd place

800^th place

austincollege.edu

artemis.austincollege.edu

Diggs, George; Lipscomb, Barney; O'Kennon, Robert (1999). Flora of North Central Texas. Botanical Research Institute of Texas. p. 404.

bonap.net

"Silphium radula". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014. Retrieved 18 April 2018.

efloras.org

Silphium radula var. radula Flora of North America

usda.gov

plants.sc.egov.usda.gov

NRCS. "Silphium radula". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 18 April 2018.