G-L Glabrous: Having no hair. Gymnosperm: A plant that bear ovules on special structures (like the scales of a cone) rather than enclosed in an ovary. Gynostegium: A specialized organ formed by the fusion of the stamens and stigmas (common in milkweeds). Head: An inflorescence comprised of a dense cluster of stalkless flowers. Example: clover, daisy. Helicoid cyme: An inflorescence with flowers on one side of the central axis. The entire structure coils to forma spiral Hood: In milkweed flowers, a boat-shaped part of the corona (a structure that rises above the true petals.) Horn: In milkweed flowers, an appendage arising from the hood of the corona (a structure that rises above the true petals.) Imbricate: Overlapping (referring to scales on a bud). Inflorescence: A flower cluster. Lanceolate: Lance-shaped; much longer than broad. Leaflet: One segment of a compound leaf. Leaf scar: The mark left on a stem once the leaf has fallen. Legume: A fruit derived from a single ovary and which opens along two longitudinal sutures. Example: pea, bean, honeylocust. Lenticel: A raised marking found on the stem. It functions in gas exchange. Lobe: a projecting part or segment of a leaf whose margin is divided by sinuses.