Category: A
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Afro-alpine
From the upper zone of mountains, above the tree line (in Africa).
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Aff.
(Affinis) akin to, near to the named taxon; not the same, but clearly related.
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Aestivation
The way in which sepals or petals are folded or packed in bud. The arrangement of the parts in the flower bud. The way sepals and petals are folded in bud.
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Aestival
Occurring only in early summer.
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Aerophore
(In ferns) a small projection or swelling along the stipe or on secondary axes, apparently for gas exchange; especially in Thelypteridaceae.
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Aerial roots
Roots emerging from the plant wholly above the ground surface. Roots growing out from the trunk above the ground, sometimes many meters long and reaching the ground. Developed by many epiphytic plants and vines and commonly seen in large numbers hanging from some trees. Other aerial roots help support the plant and in wet, oxygen-poor…
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Aerial leaves
(In aquatic plants) the leaves that are not submerged or floating.
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Aerating
(Of roots) rising out of the mud/soil, often covered with corky tissue, as in some mangrove plants.
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Aequi-
Equal or similar [old-fashioned spelling for equi-].
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Adventive
Not native to an area, but growing wild and reproducing. Said of foreign plants when sparingly introduced—not really naturalized.