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Hoja simple
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Se aplica a una hoja que no está dividida en unidades laminares más pequeñas. Opuesto de compuesto |
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Hoja unifoliolada
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Se refiere a una hoja que aparenta ser simple, pero se considera que ha evolucionado desde algún ancestro de hojas compuesta. Frecuente en las Fabaceae |
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Hojas alternas
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Se refiere a la disposición de las hojas, cuando están solitarias en cada nudo a lo largo de un eje; las hojas pueden ser simples o compuestas. Comparar este término con la definición de hojas opuestas y verticiladas. |
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Holdfast
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See hapter. |
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Holoparasite
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An achlorophyllous plant that derives all of its nutrition from its host; e.g., species of Balanophoraceae and Rafflesiaceae. |
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Holotype
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A single specimen designated by the author of the species to represent that species. If there are duplicates of that specimen, they are called isotypes. |
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Homo-
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A prefix meaning “the same.” |
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Homoecy (adj. = homoecious)
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A species that bears only bisexual flowers on each plant. |
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Homoecy (homoecious)
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Referring to a species that bears only bisexual flowers on each plant. |
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Homogamous
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Possessing flowers of one kind; e.g., the heads of certain Asteraceae with only disk flowers; referring to flowers in which the anthers release pollen at the same time as the stigma(s) is (are) receptive. |
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Homophyllous
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See isophyllous. |
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Homoptera
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The order of insects including the cicadas and leaf hoppers, the species of which are sometimes phytophagous. |
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Homospory (homosporous)
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Producing a single kind of spore; e.g., as in bryophytes, Lycopodium, and most but not all species of ferns. |
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Homostyly
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A condition in which the style and stamen lengths are more or less the same in all individuals of a species. Opposite of heterostyly. |
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Honey guide
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Same as nectar guide. |
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Hood
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One of five hollow chambers of the corona of some species of Apocynaceae subfamily Asclepiadoideae; see androecial hood. |
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Hood-shaped
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See cucullate. |
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Hoop mark
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A raised ring caused by bud scale scars that may partially or completely encircle the trunk of a tree. |
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Horn
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An flora appendage shaped like an animal’s horn; e.g., the horn of the corona of Apocynaceae subfamily Asclepiadoideae. |
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Host
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In botany, a plant upon which another plant or an animal feed on or parasitizes; e.g., many trees are hosts for parasitic plants such as mistletoes. |
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Host-specific
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Referring to an animal that lives on or feeds on a single host species. |
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Hot spot
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A concept first developed by Norman Myers in which priority for conservation is based on the idea that it will be too costly to protect all species throughout the world; thus, Myers suggested that areas with high degrees of endemism and which are under going rapid lost of habitat should be given priority for protection. As many as 44% of all species of vascular plants and 35% of all species in four vertebrate groups are confined to 25 hotspots comprising only 1.4% of the land surface of the Earth. The idea of this strategy is to put maximum effort into protecting these areas. See Myers, N. et al. 2000. Biodiversity hotspots for conservation priorities. Nature 403: 853-858. |
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Humifuse
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Referring to a growth form in which the plant is spread out over the ground. |
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Hummack
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A small mound; e.g., a mound rising above the waters of a swamp. |
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Humus
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Referring to a layer of topsoil rich in decaying organic material. |
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