Surface view: Upper epidermis of polygonal cells, sto-mata absent, cuticular striations absent (C. laevigata) or conspicuous (C. monogyna); underlying palisade parenchyma with cluster crystals of calcium oxalate up to 25 ^m in diameter; calcium oxalate prism sheaths surround the veins; lower epidermal cells have sinuous anticlinal walls, and cells found along veins are elongated and may have beaded walls; numerous anomocytic stomata, ~35 ^m (C. laevigata) or 42 ^m (C. monogyna) in length; melted

cuticular wax may be present as small droplets; unicellular covering trichomes can be absent or present; if present, they occur primarily at the margin and along veins; trichome wall slightly to heavily thickened, tapering, base inserted into the epidermis, or surrounding cells appearing like a pedestal, often arranged like a rosette; variable trichome length—short at the margin, longer (up to ~500-600 ^m) along the veins.

Transverse section: Bifacial; palisade cells in two or three rows (C. laevigata) or one row with possibly a second row of smaller cells (C. monogyna); cluster crystals of calcium oxalate occur in the palisade cells; spongy mesophyll of loosely arranged cells; calcium oxalate prisms form a sheath along the veins; collateral bundles are associated with fibers; collenchyma may occur near veins.

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