Mindblown: a blog about philosophy.
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Radiate
Spreading from, or arranged round, a common centre; (Of flowers) radially symmetric; (In flower-heads of Compositae/Asteraceae) with ray flowers on the outside and disc flowers on the inside. Pertaining to the ray. To spread out in all directions from a central point. To spread from a focus or point of origin.
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Radiant
(In Compositae/Asteraceae, especially in the tribe Cardueae), referring to capitula in which the inner hermaphrodite disc florets are surrounded by outer enlarged, sterile disc florets.
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Radial symmetry
Symmetric from a central point, as opposed to bilateral symmetry. Said of an object, such as a flower or pie, that will form mirror-image halves when cut along more than one plane. Symmetry of an organism whose parts radiate from a central axis.
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Radial spine
(In cacti and similar succulents) the spines on the edge of the areole or spine shield, often smaller or with a colour different to the central spine. Spines emerging from the edges of an areole. In cacti, those spines arising from each areole that radiate in much the same plane as the stem surface, as…
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Radial
In a circle or cylinder, going from the centre to the margin in a straight line. Refers to the outline of a flower. Any of several lines drawn through the center will divide the flower into two equal halves or mirror images. Referring to something which branches. Referring to the radius bone in the arm.…
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Rachis, rhachis (plural rachides, rhachides)
(In compound leaves) that part of the main axis distal to the petiole that bears the leaflets; (In inflorescences) that part of the main axis distal to the peduncle that bears the flowers. The axis of a pinna in a bipinnate leaf. The central elongated axis of a compound leaf or inflorescence (such as in…
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Rachilla, rhachilla
(In Gramineae/Poaceae) axis of spikelet; The ultimate flower-bearing axis of an inflorescence (specialist term used in Palmae) [not recommended].
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Rachides
Plural of rachis.
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Racemule
In a compound raceme or umbellate inflorescence, a second-order raceme.
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Racemose
In the form of a raceme, resembling a raceme. In anatomy, shaped like a cluster of grapes. Referring to glands which look like a bunch of grapes. Resembling a cluster of grapes (e.g., certain glands consisting of a number of small sacs). Resembling a bunch of grapes. The term is applied particularly to a compound…
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