Hammon, B. 2014. Penstemon seed production pests. Grand Junction, CO: Colorado State University Extension, Tri-Rivers Area. http://www.wci.colostate.edu/shtml/PenstemonPests.shtml.

Hammon, B. 2014. Penstemon seed production pests. Grand Junction, CO: Colorado State University Extension, Tri-Rivers Area. http://www.wci.colostate.edu/shtml/PenstemonPests.shtml.

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