Atlas of Foliar Surface Features in Woody Plants, VI. Carya (Juglandaceae) of North America

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Abstract
Scanning electron microscopy was used to examine foliar surface features such as trichome types and the micro-relief formed by cell contours, cuticular patterns, and epicuticular wax in the genusCarya. The fourteen taxa native to Mexico and eastern United States were sampled throughout their geographical ranges, and are represented here by specimens that include segregate taxa, interspecific hybrids, and mature and immature leaves of each. Six trichome types are recognized in this survey: acicular, fasciculate, multiradiate, solitary, capitate-glandular, and peltate scale. There are no consistent differences between representatives of either the two Sections of the genus or the two ploidy levels. Although there is significant inter- and intra-specific variation, the use of scanning electron microscopy provides few taxonomically useful characters or character-states beyond those already available through light microscopy. Foliar surfaces of the fourteen taxa and three hybrids are illustrated.