Inflorescence and Flower

Capitulum: Radiate, with both ray and disk florets; receptacle is conical to flat, with awned receptacular bracts; recurved or reflexed involucral bracts, in four series.

Phyllary: Stomata and trichomes similar to those found on the leaf.

Ray floret: Covering and glandular trichomes are abundant, similar to those found on the leaf; epidermal cells of ligule papillose; secretory ducts occur along veins; very short, thick-walled, multicellular trichomes occur at the base of the floral tube.

Disk florets: Covering and glandular trichomes are abundant, similar to those found on the leaf; tricolporate, spheroidal pollen grains, ~35-42 ^m diameter, with spiny exine.

Powder: Fragments of the leaves showing bases of covering trichomes or cicatrices, glandular trichomes and secretory ducts along the veins; covering trichomes; fragments of pitted parenchyma from the stem pith; bundles of fibers, sometimes with phytomelanin coating (originating from the cypsela present in the flowers); tricolporate spheroidal pollen grains. The secretory tissues of the stem are inconspicuous in powder.

Chinese Herbs

Chinese Herbs

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