RUTACEAE (Rue family)

Ptelea trifoliata L. common hoptree [US; Arizona; Yavapai County; Prescott; T13N, R2W, S4; 5,600 feet][hill overlooking the 500 block of S. Pleasant St.; May 17, 1993; Collected & identified by Chuck Walker; #AZ89]

Ptelea trifoliata L. ssp. trifoliata var. trifoliata common hoptree [US; Illinois; Monroe County; Fults; T4S, R10W, S27; 38 deg. 9.427'N, 90 deg. 11.451'W; 590 feet][at edge of limestone cliff, Fults Hill Prairie Nature Preserve; July 22, 2002; Collected by Chuck Walker; Identified by Dr. Mark A. Basinger; #IL403]

Thamnosma montana Torr. & Fr�m. turpentinebroom [US; Arizona; Coconino County; T30N, R4E, S8; 1,750 feet][one mile down the Grand View Trail, Grand Canyon National Park; March 18, 1996; Collected & identified by Chuck Walker; #AZ253]

Zanthoxylum clava-herculis L. Hercules' club [US; Louisiana; Calcasieu Parish; Moss Bluff; T8S, R8W, S34; 25 feet][along Camp Fire Rd.; September 20, 1993; Collected by Chuck Walker; Identified by Dr. Robert Rumsey; #LA16]