FIGURE 1 in Taxonomic revision of the Opuntia humifusa complex (Opuntieae: Cactaceae) of the eastern United States

FIGURE 1. SEM micrographs of characters of Opuntia from the O. humifusa complex. A) close-up of glochids of O. cespitosa at 106x (Majure 736), B-C) close-up of spine surfaces showing overlapping cells creating retrorse barbs in O. drummondii (Majure 843), B) spine tip at 200x, C) mid-section of spine at 289x, D) pollen grain of O. cespitosa (Majure 736) at 850x, E) pollen grain of O. mesacantha subsp. lata at 900x (Ervin s.n.), F) seed of O. cespitosa at 16x (Majure 736), G) seed of O. drummondii at 20x (Majure 843). All photos taken by L.C. Majure.