Mindblown: a blog about philosophy.
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Receptive
(Of style or stigma) prepared to receive pollen for pollen tube growth and fertilisation.
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Receptacle
The expanded part at the end of the flower stalk on which the organs of a flower (i.e. sepals, petals, stamens and carpels) are inserted; receptacles are fused in capitulate inflorescences and then the word is often used to mean the entire broadened stalk (head) on which the individual flowers develop. (In species with compound…
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Recaulescent
(Of a leaf or part of a leaf ) fused with the stem.
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Recaulescence
The fusion of a leaf or part of the leaf with the stem.
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RbcL
The plastid gene used in phylogenetics to study relationships.
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Ray floret
The zygomorphic florets of the margin of a head (capitulum) of the Compositae/Asteraceae when different from those of the centre (or disc) florets. The bilaterally symmetrical flower of an inflorescence in some Asteraceae, different from the radially symmetrical disc florets. One of the apparent ‘petals’ of a daisy (or composite) flower, actually a small flower.…
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Ray
One of the radiating branches of an umbel; (In Compositae/Asteraceae) the limb of a ray floret. In the sunflower family: the ligulate, or strap-shaped, marginal flowers on the head, as opposed to the central regular flowers. In the parsley family: one of the primary branches of an umbel or similar inflorescence. A pedicel within an…
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Raunkiaer’s system
System for categorising plants according how they survive the adverse (either cold or dry) season.
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Ratoon
Stem sprouting from the root of a cropped plant (as in sugarcane).
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Rapiform
(Of underground parts) shaped like a turnip, obovoid and rounded at the apex, tapering downwards.
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