RACEME: a flower-cluster in which the stalked flowers are arranged along an elongated axis. RACEMOSE: raceme-like. RACHIS: the axis. RADICAL: arising from the root, or portion of the stem resembling the root. RECEPTACLE: the usually somewhat enlarged portion of the stem on which parts of a flower or of a flower-cluster are borne. RENIFORM: kidney-shaped. REPAND: wavy-margined. RETICULATE: arranged like a network. REVOLUTE: rolled backward. RHIZOME: an underground stem; a rootstock. RHOMBIC: having the shape of a four-sided figure with parallel and equal sides which may be either perpendicular or oblique to each other. RHOMBOID: of a somewhat rhombic shape. ROTATE: wheel-shaped. RUNCINATE: coarsely cut into with the segments turned backward. SAGITTATE: shaped like an arrow-head with the lobes turned downward. SAMARA: a simple, indehiscent, winged fruit. SAPROPHYTE: a plant which grows on dead organic matter. SCALE: a minute, rudimentary leaf. SCAPE: a leafless or nearly leafless flower-stalk arising from near the ground. SCARIOUS: dry, thin, membranous. SCURF: minute scales on the epidermis (skin). SEPALS: the divisions of the calyx. SERRATE: with teeth pointing forwards. SERRULATE: with minute forward pointing teeth. SESSILE: (leaf) without any stalk. SHEATH: a tubular structure such as is formed by the lower part of the leaves of grasses, etc. SILICLE: a short and broad silique. SILIQUE: the elongated two-valved and usually dehiscent fruit of the Cress family. It is divided by a partition and the placentæ are parietal. SINUATE: with a strongly wavy margin. SINUS: the recess between the lobes of a leaf. SORI: the fruit-dots of ferns. SPADIX: a fleshy spike as in the Araceæ. SPATHE: a large bract or pair of bracts enclosing a flower or an inflorescence. SPATULATE: spoon-shaped. SPIKE: a flower-cluster in which the flowers are stalkless on an elongated axis. SPORANGES: the sacs containing the spores. SPORE: the reproductive body of ferns. SPOROPHYLL: leaf-like organ or receptacle containing spores. STAMEN: the organ of the flower which produces the pollen. STAMINODIA: sterile stamens or structures which are developed in the place of stamens. STELLATE: star-shaped. STIPE: the leaf-stalk of a fern. STIPULE: an appendage such as is found at the base of many leaf-stalks. STOLON: a trailing and rooting shoot. STRIATE: marked with slender, longitudinal stripes. STRICT: straight and upright. STYLE: (of pistil) the elongated portion at top of ovary. SUBULATE: awl-shaped. SUPERIOR: (side of flower) the one next the axis of a flower-cluster; (ovary) free from calyx tube.