Comparative Anatomy and Morphology of Asclepias perennis and Asclepias tuberosa Subspecies Rolfsii

摘要: Plants of Asclepias perennis Watt. and A. tuberosa L. ssp. rolfsii are examined to determine structural characteristics these species from different habitats. Some features in both related growth habit. Stomata occur more frequently on the adaxial surface leaves dry, sunny sites abundant abaxial sites. The dorsiventral have well-developed palisade spongy mesophyll layers thicker plants because a large mesophyll. Leaves greater length-to-width ratios than wet, shaded Bicollateral bundles constitute midrib major veins petiole bundles, while collateral minor leaves. Druse-containing cells branched, nonarticulated laticifers stems also found the...