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18b. Croton lindheimerianus Scheele var. tharpii M. C. Johnston, Southw. Naturalist. 3: 188. 1959.
Tharp’s three-seed croton Tharp’s three-seed croton
Plants roughly tomentose. Leaf blades lanceolate, length mostly more than 2 times width, apex acute. Pedicels erect in fruit.
Flowering Jul–Oct. Loamy or rocky flats, limestone washes; 1000–1600 m; Ariz., Tex.; Mexico (Coahuila).
Variety tharpii is found in the flora area only in southern Arizona and western Texas.
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