Browsing: R

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Regular flower

One which is radially symmetrical, where± any straight line drawn through the centre produces two mirror images.

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Ray-florets or ligulate-florets

The (usually) strap-shaped spreading florets found in some of the Daisy family, occurring either around the edge of the flower-head…

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Radioactive iodine

Isotopes of iodine used in the investigation and treatment of hyperthyroidism. Iodine- 12 3 is used for most scans; iodine-…

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Renal artery stenosis

Narrowing of an artery to a kidney that, if severe, may cause hypertension by increasing renin. The renin then generates…

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Ruminate endosperm

Intruded endosperm in a seed, formed by the infloding of the inner layer of the seed coat, as in nutmeg.…

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Ribs

The raised rows on stems of cacti; the primary veins of leaves.

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