Category: U
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Understorey
Sub-canopy layer(s) of vegetation in forest or woodland; usually denoting shrub and small tree layer. A layer of vegetation below the canopy of a forest.
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Uncinulate
With minute, strongly hooked hairs.
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Uncinate
Hooked at the apex or tip. Hooked hairs. Shaped like a hook.
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Unarmed
Without spines or prickles. Destitute of spines, prickles, or like appendages.
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Umbraculate, umbraculiform
Anything that provides shade, like an umbrella or a tree canopy.
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Umbonate
± round and bearing a small boss or elevation in the centre. Colonial shape description implying a centre projecting from a round surface (from the Latin umbo-a boss or knob).
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Umbo
A small blunt protuberance (e.g. in the centre of a cone scale). A raised, conical mound on the center of the cap of some mushrooms. Protrusion or knob on the disc or center of the cap. A projecting part in the middle of the outer side of the eardrum. Rounded projection; a knoblike center. A…
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Umbilicate
Navel-like, with a small central hollow or depression. Depressed in the centre, like one end of an apple. Having the appearance of being pitted or indented; shaped like an umbilicus; used to describe some skin conditions. With a small depression, like a navel, in the centre. Dimpled, pitted, or shaped like a navel. Said of…
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Umbellule
Diminuitive of umbel.
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Umbelliform
In the shape of an umbel.