Glossary of Botanical Terms

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Raceme.  An elongated determinate flower-cluster with each flower pedicelled.
Racemose.  In recemes, or resembling a raceme.
Rachilla.  The asix of the spikelet in grasses.
Rachis.  The axis of a compound leaf, or of a spike, or raceme.
Radiant.  With the marginal flowers enlarged and ray-like.
Radiate.  With ray-flowers, radiating.
Radicle.  The rudimetnary stem of the embryo ; hypocotyl.
Radicular.  Pertaining to the radicle or hypocotyl.
Raphe (Rhaphe).  the ridge connecting the hilum and chalaza of an anatropous or amphitropous ovule ; the ridge on the sporocarp of Marsilea.
Ray.  One of the peduncles or branches of an unbrel ; the falt marginal flowrs in Compositae.
Receptacle.  The end of the flower stalk, bearing the floral organs, or, in Compositae, the flowrs ; also, in some ferns, an axis bearing sporanges.
Recurved.  Curved backward.
Reflexed.  Bent backward abruptly.
Regular.  Having the members of each part alike in size and shape.
Reniform.  Kidney-shaped.
Repand.  With a somewhat wavy margin.
Reticulate.  Arranged as a network.
Retrorse.  Turned backward or downward.
Retuse.  With a shallow notch at the end.
Revolute.  Rolled backward.
Rhachis.  See Rachis.
Rhizome.  See Rootstock.
.  The gaping mouth of a two-lipped corolla.
Rootstock.  A subterranean sem, or part of one.
Rostellum.  Beak of the style in Orchids.
Rostrate.  With a beak.
Rosulate.  Like a rosette.
Rotate.  With a flat round corolla-limb.
Rugose.  Wrinkled.
Runcinate.  Sharply pinnatifid, or incised, the lobes or segments turned backward.

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Volume 1, page xx: Nathanie1 L. Britton amd Addison Lord Brown,
An Illustrated Flora of the Northern United States,Canada, and the British Possessions from Newfoundland to the Parallel of the Southern Boundary of Virginia, and from the Atlantic Ocean Westward to the 102d Meridian, Charles Scribner's Sons, 1913

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