Aquatic, Wetland and Invasive Plant Glossary

Aquatic, Wetland and Invasive Plant Glossary

raceme search for term
- n. (L. racemus, bunch) inflorescence having a common axis and stalked flowers in acropetel succession.
racemose search for term
- 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 search for term
- n. (Gr. rhachis, spine) the zigzag center upon which the florets are arranged in the spikelet of grasses or in some sedges.
rachis search for term
- 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 search for term
- a. (L. radius, a ray, a rod, a spoke) arranged or having parts arranged like rays developing uniformly around a central axis.
radially symmetrical search for term
- 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 search for term
- n. (L. ramus, branch) an individual member of a clone.
receptacle search for term
- n. (L. recipere, to receive) the more or less expanded apex of a floral axis which bears the floral parts.
remote search for term
- a. (L. remotus, to remove) separated from one another; separated by intervals or spaces greater than the ordinary.
reniform search for term
- a. (L. ren, kidney; forma, shape) having the form or shape of a kidney.
repent search for term
- a. (L. repens, crawling) said of a stem that is prostrate and rooting at the nodes.
reticulate search for term
- a. (L. reticulatus, latticed) like network.
retinaculum search for term
- 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 search for term
- a. (L. retrorsum, backward) having hairs or other processes turned toward the base.
retuse search for term
- a. (L. retuses, blunted) with a shallow, rounded notch at the apex.
revolute search for term
- a. (L. revolvere, to roll back) said of margins that are rolled backward (toward the abaxial side).
rhizomatous tuber search for term
- same as a corm.
rhizome search for term
- 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 search for term
- 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 search for term
- 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.
root pressure search for term
- 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.
root tuber search for term
- swollen food-storing roots.
rootlet search for term
- n., a radicel; a little root or small branch of a root.
rootstock search for term
- same as a rhizome.
roseate search for term
- a. (L. roseus, rosy) rose-colored; rosy.
rosette search for term
- n. (Fr., Dim. of rose) a group of organs, such as leaves, clustered and crowned around a common point of attachment.
rotate search for term
- a. (L. rota, wheel) shaped like a wheel; radially spreading in one plane.
rugose search for term
- a. (L. ruga, a wrinkle) having or full of wrinkles; corrugated; ridged.
rugulose search for term
- a., same as rugose.
runcinate search for term
- 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 search for term
- 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.