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Flora of North America Glossary

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Term Synonyms Category Limitation Definition
racemiform = raceme-like architecture capitulescence, inflorescence Resembling a raceme, but not strictly such.
racemose architecture inflorescence Comprising one or more racemes.
rachilla 1 var. rhachilla STRUCTURE A second- or higher-order axis of a compound leaf blade, bearing higher-order rachillae, leaflets, pinnules and/or tendrils.
rachilla 2 var. rhachilla STRUCTURE A second-order axis in an inflorescence, especially the axis bearing the florets in a spikelet; esp. in Cyperaceae, Poaceae (Gramineae).
rachis 1 var. rhachis STRUCTURE A main or first-order axis of a compound leaf blade.
rachis 2 var. rhachis STRUCTURE A main or first-order axis of an inflorescence.
radial = radiant, radiate, stellate arrangement Disposed about and mutually divergent from a common geometric center in two or three dimensions, thus collectively actinomorphic.
radiant 1 architecture capitulum (head) Bearing one or more peripheral series of florets that are bisexual, pistillate, or neuter and that have relatively large actinomorphic corollas, and one or more central series of usually bisexual florets that have relatively small actinomorphic corollas; in Asteraceae (Compositae).
radiant 2 = radial, radiate, stellate arrangement Disposed about and mutually divergent from a common geometric center in two or three dimensions, thus collectively actinomorphic.
radiate 1 architecture capitulum (head) Bearing one or more peripheral series of florets that are pistillate (either fertile or sterile) or neuter and that have zygomorphic corollas, and one or more central series of bisexual or functionally staminate florets that have actinomorphic corollas; in Asteraceae (Compositae).
radiate 2 = radial, radiant, stellate arrangement Disposed about and mutually divergent from a common geometric center in two or three dimensions, thus collectively actinomorphic.
radical insertion Upon, arising from, or otherwise directly associated with the root.
radical position Upon, arising from, or otherwise directly associated with the root.
radicant = rooting architecture structure Developing adventitious roots; esp. stems or leaves.
radicate = rooted architecture plant Having one or more roots.
radicle STRUCTURE The primary root, or its primordium, in an embryo; the portion of an embryo axis that develops into the root.
radix pl. radices = root STRUCTURE A vascularized axis that is not internally differentiated into nodes and internodes and that branches endogenously, serving for anchorage, absorption and/or storage; collectively, all those portions of a plant body not belonging (anatomically) to the shoot. See also adventitious root, climbing root, diffuse root, knee root, primary root, prop root, secondary root, stilt root.
raised > prominent, prominulous prominence Protruding above the general level of the surrounding surface.
ramal insertion Upon or otherwise directly associated with the stem branches.
ramal position Upon or otherwise directly associated with the stem branches.
ramentaceous pubescence Of small, fragile, scarious, planate trichomes.
ramiform = branched, ramose, ramous architecture axis, laminar vein Dividing into or bearing branches.
ramose = branched, ramiform, ramous architecture axis, laminar vein Dividing into or bearing branches.
ramous = branched, ramiform, ramose architecture axis, laminar vein Dividing into or bearing branches.
rank FEATURE A sequence of lateral structures arising from the same axis at successive points along its length and diverging from it in the same direction.
Displaying 1876-1900 of 2673