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The goals of this study were (1) to make a careful study of the foliar epidermis of Grindelia cabrerae var. cabrerae, Solidago chilensis y Wedelia buphthalmiflora , native Asteraceae from Argentina which have ornamental potential, and (2) to determine variables that indicate adaptation to xeromorphic environments. Five adult leaves from five plants were selected from each population. All the material was fixed in FAA. The epidermis of both foliar sides were macer - ated in hypochlorite of sodium, and obtained by scraping. They were stained with safranine and mounted in water-glycerine (1:1). From each slide, five fields were chosen and frequency of the epidermal cells, stomata (SF) and trichomes, length of the stomatal complex, and stomatal index (SI) were studied. The cuticle was analyzed in foliar cross sections. Statistical tests were performed. From an eco- logical point of view, the three species showed epidermal characters related to xeric habitats: thick cuticles, pubescence and great stomatal number. Grindelia had straight epidermal cell walls and glandular trichomes which produce resinous substances. Solidago showed the smallest ordinary epidermal cells and stomata, and a new (unmen- tioned to date) type of uniseriate hair. Wedelia had a lot of glandu- lar and non-glandular hairs, some of them were big and very orna- mented. It also showed a type of uniseriate hair with 2 or 3 cells, with smooth ornamented walls in the basal cells, unknown to date. The three species had a greater (1) number of stomata and (2) SI at the lower leaf side. Solidago showed significant differences in SF, and Wedelia in SI and SF. Also, the study species had non-glandular trichomes at both leaf sides, but Grindelia and Wedelia showed also glandular trichomes. Grindelia and Wedelia differed in the greater tri - chome density at the upper or lower leaf side, respectively. Trichome densities were different at the upper or lower leaf sides in Wedelia.

Leaf epidermis in three Asteraceae native species of Argentina with ornamental potential