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raceme - n. (L. racemus, bunch)
inflorescence having a common axis and
stalked flowers in acropetel succession.
racemose - a., an inflorescence whose growing points continue to add to the inflorescence and in which there are no terminal flowers, and the branching is monopodial, as racemes, or spikes. rachilla - n. (Gr. rhachis, spine) the zigzag center upon which the florets are arranged in the spikelet of grasses or in some sedges. rachis - n., the central prolongation of the stalk (peduncle), the axis through an inflorescence, or of a leaf stalk (petiole), the axis through a compound leaf. radially - a. (L. radius, a ray, a rod, a spoke) arranged or having parts arranged like rays developing uniformly around a central axis. radially symmetrical - said of a flower or set of flower parts which can be cut through the center into equal and similar parts along two or more planes; actinomorphic. ramet - n. (L. ramus, branch) an individual member of a clone. receptacle - n. (L. recipere, to receive) the more or less expanded apex of a floral axis which bears the floral parts. remote - a. (L. remotus, to remove) separated from one another; separated by intervals or spaces greater than the ordinary. reniform - a. (L. ren, kidney; forma, shape) having the form or shape of a kidney. repent - a. (L. repens, crawling) said of a stem that is prostrate and rooting at the nodes. reticulate - a. (L. reticulatus, latticed) like network. retinaculum - n. (NL. fr. L. that which holds or binds, band, fr. retinere, to hold back, retain) the hook-like funicle of a seed of a plant of the family Acanthaceae; a band or band-like structure that holds an organ in place. pl. retinacula. retrorse - a. (L. retrorsum, backward) having hairs or other processes turned toward the base. retuse - a. (L. retuses, blunted) with a shallow, rounded notch at the apex. revolute - a. (L. revolvere, to roll back) said of margins that are rolled backward (toward the abaxial side). rhizomatous tuber - same as a corm. rhizome - n. (Gr. rhiza, a root) a subterranean horizontal root-like stem sending out leaves and shoots from its upper surface and roots from its lower surface. rhombus - n. (Gr. rhombos, object that can be turned) an outline like a rhomboid, a parallelogram with equal sides, having two oblique angles and two acute angles. root - n. (AS. wyrt, root) the part of a plant, usually below the ground, that holds the plant in position, draws water and nutrients from the soil, stores food, and is typically non-green. rootlet - n., a radicel; a little root or small branch of a root. root pressure - pressure in the roots which, when the shoot is cut off, will cause liquid to secrete from the root stump; the mechanisms and tissues involved in this process are not clearly understood. rootstock - same as a rhizome. root tuber - swollen food-storing roots. roseate - a. (L. roseus, rosy) rose-colored; rosy. rosette - n. (Fr., Dim. of rose) a group of organs, such as leaves, clustered and crowned around a common point of attachment. rotate - a. (L. rota, wheel) shaped like a wheel; radially spreading in one plane. rugose - a. (L. ruga, a wrinkle) having or full of wrinkles; corrugated; ridged. rugulose - a., same as rugose. runcinate - a. (L. runcina, a plane) pinnatified, with the lobes convex before and straight behind, pointing backward, like the teeth of a saw, as in the dandelion leaf. runner - n. (AS. rinnan, to run) a specialized stolon consisting of a prostrate stem rooting at the node and forming a new plant which eventually becomes detached from the parent plant as in a strawberry plant. |