Rachilla The axis of a grass or sedge spikelet; a small rachis
Glossary: Flower / inflorescence morphology
Purdue Arboretum botanical terminology reference and learning database.
Flower / inflorescence morphology
Rachis The central rib of a compound leaf or flower cluster
Receptacle The part of a flower that holds all the floral structures together. It is located at the top of the flower stalk, where the petals, sepals, stamens, and carpels are attached. Did You Know? In some plants, the receptacle becomes part of the fruit. For example, the fleshy edible portion of a strawberry develops primarily from the enlarged receptacle, while the tiny "seeds" on…
Resupinate Upside down, due to twisting of the pedicel, as in the flowers of some orchids
Salverform Shape of a flower with a slender tube expanding into petals shaped like a flat disk Did you know? Phlox flowers are salverform, with a narrow tube opening suddenly into a flat face.
Scape A flower stalk arising from the ground. This feature helps explain how flowers are arranged, how pollination happens, or how seeds begin to form.
Spathe A bract or leaf encasing a flower cluster. This feature helps explain how flowers are arranged, how pollination happens, or how seeds begin to form. Did you know? The colorful part of a peace lily is a spathe, a modified bract, not a true petal.
Spike A flowering stem with flowers directly attached. This feature helps explain how flowers are arranged, how pollination happens, or how seeds begin to form.
Spur A specialized short twig of certain fruit trees on which flowers and fruit are borne. A thin spike-like part attached to a flower or other structure.
Sterile Describing a flower that cannot produce viable seeds. This feature helps explain how flowers are arranged, how pollination happens, or how seeds begin to form.