Flora of North America Glossary
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| Term | Synonyms | Category | Limitation | Definition |
|---|---|---|---|---|
| horn-shaped | = corniform | solid shape | Straight or curved and slenderly conic or conoidal, like an animal horn. | |
| horny | = corneous | texture | Hard, dense, fine-grained or compactly fibrous, and tough; resembling the substance of animal horn. | |
| horseshoe-shaped | = hippocrepiform | solid shape | Relatively slender and strongly compressed, the whole strongly curved over its length in a plane perpendicular to the direction of compression and forming an incomplete circle, the ends somewhat straighter than the rest and parallel or nearly so; like a horseshoe. | |
| husk | STRUCTURE | A more or less dry, hard or fibrous, simple or compound enclosure or outer layer of a seed, fruit or inflorescence. | ||
| hyaline | = pellucid; > translucent, transparent | coloration | Transmitting light uniformly. | |
| hydathode | STRUCTURE | A multicellular, anatomically distinctive structure located within a leaf at its periphery, its cells surrounding a central canal that opens to the exterior, through which water is actively discharged under humid conditions that impede the rate of transpiration; this liquid discharge is termed guttation. | ||
| hydrocyanic | = almondy | odor | Pungently fruity like almonds, due to the presence of hydrocyanin or a closely related compound. | |
| hygroscopic | architecture | structure | Increasing or decreasing in size according to the presence or absence of surrounding moisture, due to differential swelling or shrinking of component anatomical structures. | |
| hypanthium 1 (broad sense) pl. hypanthia | = floral cup (broad sense), floral tube | STRUCTURE | A complex structure comprising fused portions of the perianth and/or androecium of a flower, sometimes also including receptacular tissue; surrounding and wholly, partly, or not at all adnate to the gynoecium; subdivided morphologically into casing, collar and/or neck; sometimes bearing free distal portions of the constituent structures. | |
| hypanthium 2 (strict sense) pl. hypanthia | = floral cup (strict sense) | STRUCTURE | A marginal protrusion from or enlargement of the receptacle (torus) of a flower, encircling and wholly, partly or not at all adnate to the gynoecium, bearing the perianth and androecium. | |
| hyphodromous | = one-veined, single-veined | venation | Having one median, primary vein and no other venation externally evident. | |
| hypochilium | STRUCTURE | The proximal portion of a labellum (lip) that has distinct proximal, distal, and sometimes also central parts; in Orchidaceae. See also epichilium, mesochilium. | ||
| hypocotyl | STRUCTURE | That portion of an embryo axis between the level of cotyledon insertion above and the root meristem (or radicle, if present) below. | ||
| hypocrateriform | = salverform | solid shape | perianth, calyx, corolla | Having a relatively long, slender tube and a divaricate, planate limb resembling a round platter. |
| hypogeal | = hypogeous, subterranean | location | Within the ground, beneath its surface; esp. of cotyledons following seed germination. | |
| hypogeous | = hypogeal, subterranean | location | Within the ground, beneath its surface; esp. of cotyledons following seed germination. | |
| hypogynium pl. hypogynia | = gynophore; < stalk, stipe (broad sense, not recommended) | STRUCTURE | The basal portion of an ovary when constricted and stalk-like above the level of perianth insertion, bearing the main body of the pistil at its summit; in Cyperaceae. | |
| hypogynous | insertion | perianth, calyx, corolla, androecium | Entirely free from the gynoecium or any floral cup, arising from a level proximal or lateral to the base of the gynoecium. See also epigynous, perigynous. | |
| hyponastic | development | laminar structure | Having the abaxial surface differentiating and growing faster than the adaxial surface, thus, until maturity, development of the former more advanced than the latter at any given time and the structure as a whole involute or incurved. | |
| hypostom(at)ic | = hypostomatous | architecture | foliaceous structure | Having stomata on only the abaxial surface. |
| hypostomatous | = hypostom(at)ic | architecture | foliaceous structure | Having stomata on only the abaxial surface. |
| hysteranthous | maturation | non-floral structure, esp. leaf | Maturing later than the flowers. | |
| hysterophyllous | maturation | non-foliar structure, esp. flower | Maturing later than the leaves. | |
| idiogamous | = autogamous, automictic, self-fertilizing, selfing; > geitonogamous | reproduction | taxon | Having fertilization regularly involving gametes derived from the same plant. |
| imbricate(d) 1 | = overlapping | aestivation | Having members whorled or spirally inserted and overlapping one another, each overlapping or overlapped to either side, and also above or below if spirally arranged or in multiple whorls. |
Displaying 1151-1175 of 2673