Category: A
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Arhizous
Without roots.
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Areole (plural areoles)
Circular areas on a surface that are divided from similar areas by a division line such as a vein; Usually flat area on each side of some mimosoid legume seeds that is surrounded by the pleurogram; In Cactaceae, the spine-bearing cushion; extremely reduced branches (axillary buds) that usually bear spines, but can also become stems…
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Areolate
With an areole or areoles, divided into distinct spaces by boundary lines.
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Arcuate
Curved like a bow. An uncommon pattern in which the major veins curve gently upward.
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Arctic
In cold climates, above the limits of cultivation; usually applied to high latitudes, inside the Arctic or Antarctic circles. Growing in cold climates, at higher latitudes of the Northern Hemisphere.
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Arching
Bending, like a bow.
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Archegonium (plural archegonia)
Female sexual organ in cryptogams and gymnosperms, (male equivalent is antheridium).
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Arborescent
Becoming tree-like. Of tree-like habit.
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Arachnoid
(Type of indument) cobwebby, tangled cottony, the hairs in several directions and tangling. Slender white loosely tangled hairs; cobwebby. The middle of the three membranes covering the brain. The middle of the three membranes covering the brain and spinal cord, which has a fine, almost cobweblike, texture. Between it and the pia mater within lies…
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Arable
Land used for growing crops.