Abstract
SUMMARYThe two stigma lobes of Galinsoga quadriradiata initially are straight and parallel to each other but they gradually become recurved. Transmitting tissue of the stigma and style of both ray and disc flowers consists of the adaxial epidermis, the next 2–4 cell layers subtending the adaxial epidermis in both organs, and a secretory duct formed by a ring of 4–5 cells. The abaxial epidermis of stigmas is a part of transmitting tissue only in disc flowers. Walls of transmitting tissue cells subtending the adaxial epidermis of the stigma are thicker than walls of other cells in both organs. Histochemical test results indicate these walls have a high pectin content. Stigmal and stylar exudates are mainly lipid but they also have minor moieties of protein and carbohydrate. Stylar exudate is richer in unsaturated fatty acids than is stigmal exudate. Pollen grains may adhere to and germinate on either surface of disc flower stigmas whereas they do so only on the adaxial surface of ray flower stigmas. Direct ...
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