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Obovate
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Obovate refers to a leaf, sepal, petal, or other flat structure that is wider above the midpoint and has a length-to-width ratio of 1.5:1 to less than 2:1. |
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Obtriangular
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A plane, inversely triangular shape with the attachment at the pointed end. |
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Obturamenta (singular = obturamentum)
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See basal stoppers. |
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Obturators
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In the Styracaceae, outgrowths of the placental wall that partly cover the ovules. |
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Obtuse
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Blunt, usually referring to the apex or the base of a flattened structure (such as a leaf, bract, or petal) in which the two sides are straight and, when they meet, form an angle greater than 90°. |
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Obtuso
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Usualmente se refiere a la base de un órgano de dos dimensiones (tal como una hoja), en el que el ángulo formado por las márgenes convergentes son superiores a 90°. |
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Ochraceous
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Ocher-colored, yellow-brown. |
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Ochroleucous
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Yellowish white. |
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Ócrea
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Estructura formada de las estípulas fusionadas hacia la base, formando una vaina que rodea a una rama; por ejemplo, éste es un caracter diagnóstico en las Polygonaceae |
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Ocrea
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A structure formed of stipules fused into a sheath and surrounding the stem; i.e., a diagnostic character of the Polygonaceae; |
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Ocrea
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A structure formed of stipules fused into a sheath and surrounding the stem; i.e., a diagnostic character of the Polygonaceae; in palms, an extension of the leaf sheath beyond the petiole insertion, is a different kind of ligule. |
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Odd-pinnate leaf
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Pinnate with an odd number of leaflets; i.e., without a terminal leaflet. Same as imparipinnate. |
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Olid
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Emitting a smell. |
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Oligotrophic
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Referring to habitats low in nutrients. |
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Ontogenetic
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Referring to ontogeny. |
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Ontogeny
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The course of growth and development of a living organism from inception to maturity. The famous saying, "ontogeny recapitulates phylogeny" means that the development of the species can be seen in the development of an individual of the species. |
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Opercular opening
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The opening of a dehiscent-fruited species of Lecythidaceae. |
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Opercular rim
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The circular scar that indicates where the operculum was attached to the fruit. |
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Operculate
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Possessing an operculum. Same as lid. |
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Operculum
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The lid of the fruit of species with circumscissilely dehiscent fruits as found in many species of Lecythidaceae; a valvelike opening into the stony endocarp of the fruit of some species (e.g., Humiriaceae); referring to a seed with an opening covered by a lid (e.g., Zingiberaceae) or the membranous cover of the nectary in Passiflora (Passifloraceae). |
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Operculum (plural = opercula)
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Lid-like; the lid of a dehiscent fruit as found in many, but not all, Lecythidaceae. |
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Opposite
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Arising from an axis, such as leaves from a stem, in pairs at the same node. Compare with alternate and whorled. |
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Opposite leaves
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Reffering to leaves that arise from an axis in pairs at the same node. Compare with alternate and whorled. |
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Opuesta
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Se refiere a la disposición de las hojas, cuando están en pares, insertas una a cada lado en un mismo nudo. Comparar con alterna y verticilada |
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Oral setae
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Coarse, bristlelike appendages present at the summit of the leaf sheaths of some grasses. |
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