Category: H
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Haustorium (plural haustoria)
The sucker of a parasitic plant by which the parasite anchors itself into the host plant. Roots or suckers found in parasitic plants. A structure by which a parasitic plant anchors itself to and extracts nutrition from its host. In parasitic vascular plants, a specialized outgrowth from the stem or root that penetrates the living…
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Haulm
The stem in beans, peas, potatoes and grasses [old-fashioned term].
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Hastula
A small flange of tissue found on the abaxial and/or adaxial face where the lamina joins the petiole in most palmate and costapalmate leaves (specialist term used in Palmae, 1986). A flange of tissue where a palmate or costapalmate leaf joins the petiole in Arecaceae.
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Hastate
(Of a leaf-base) with two ± triangular lobes pointed outwards. More or less arrowhead-shaped, but with the basal lobes divergent. Shaped like a halberd. Shaped like a late medieval pike-head known as a ‘Halberd’, used to describe the base of a leaf.
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Harmomegathy
Change of shape in response to change in hydration level.
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Hardy
Able to withstand unfavorable conditions or seasons, usually with reference to winter conditions. Capable of surviving unfavorable conditions, such as cold weather.
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Hardwoods
Wood from non-coniferous trees (as opposed to coniferous tree wood, softwood). In the broad sense, denotes a non-coniferous tree, such as maple, beech, birch, oak, aspen, cherry, basswood, cottonwood, willow, alder, and so on.
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Haptera (singular hapteron)
Adhesive-secreting disc-like holdfasts, root-like structures attaching the thallus of plants such as Podostemaceae to their rocky substrate.
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Haplostemonous
With stamens equal in number to petals.
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Haplopetalous
With petals in one series [unusual term].