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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.