Flora of North America Glossary
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| Term | Synonyms | Category | Limitation | Definition |
|---|---|---|---|---|
| uncinate | = hamate, hooked | apex | Having a recurved terminal portion that resembles a hook. | |
| unctuous 1 | = greasy, oily, oleaginous | coating | Of a grease- or oil-like film. | |
| unctuous 2 | = greasy, oily, oleaginous | texture | Liquid or deformably solid, cohesive, and slippery to the touch. | |
| undershrub | = subshrub, suffrutex | nominative | plant | Of shrub-like form but with only the base woody, bearing herbaceous branches that die back at the end of each growing season. See also bush, frutex, shrub, tree, woody clump. |
| undulate | = wavy | margin | Having regular, curved, smoothly connected, alternating, wave-like deviations upward and downward from the general plane of the structure. | |
| unequal | size | equivalent structures | Distinctly differing in extent. See also equal, subequal. | |
| unguiculate | = clawed | plane shape | l | Having an abruptly much narrower proximal portion (unguis or claw), itself of variable shape but usually attenuate toward the base; esp. petals. |
| unguis pl. ungues | = claw | STRUCTURE | The abruptly much narrower proximal portion, when present, of a laminar structure, esp. a petal; of variable shape itself, but usually attenuate toward the base. | |
| uni… | = mono…, one-…, single-… | prefix | Indicating presence of or constitution by one entity of the type denoted by the term's stem; as in unicellular, unifloral, unifoliate. See also entries for particular terms with this prefix whose meanings, at least in some applications, are more specific than usually indicated by such combination. | |
| unifacial | architecture | Having two opposite broad surfaces that are essentially similar in appearance. | ||
| unifoliolate | = one-leafleted, single-leafleted | architecture | foliaceous structure | Structurally compound but with only one leaflet, whose nature (as a leaflet, not a leaf) is revealed by an evident articulation with the petiole, this condition presumably derived by evolutionary reduction from a multifoliolate precursor. |
| unijugate | = bifoliolate, two-leafleted | architecture | foliaceous structure | Compound with one pair of leaflets. |
| unilabiate | = one-lipped; < labiate, lipped | architecture | perianth, calyx, corolla | Strongly zygomorphic with connate and/or coherent members some or all of whose distal portions form one lip-like structure. |
| unilateral 1 | = one-sided | architecture | Having only one side, as compared with presumably equivalent, bilaterally symmetric structures. | |
| unilateral 2 | = one-sided | orientation | Disposed or directed toward one side only. | |
| unilateral 3 | = one-sided | insertion | Upon or arising from one side only of the bearing structure. | |
| unilateral 3 | = one-sided | position | Upon or arising from one side only of the bearing structure. | |
| unisexual | reproduction | Having functional reproductive structures of only one sex. See also imperfect, pistillate, staminate. | ||
| unstalked | = exstipitate, sessile, stalkless | architecture | structure | Lacking a stalk, thus inserted ("sitting") directly upon the bearing structure. |
| upcurved | = ascending, assurgent | orientation | lateral structure | Spreading at the base and then curving upward or forward, the distal portion more or less parallel to the bearing structure. |
| urceolate | = urn-shaped | solid shape | perianth, calyx, corolla | Having a truncate-ellipsoid tube and a distinct, erect limb, the whole somewhat constricted between tube and limb. See also cotyliform, cyathiform. |
| urent | = stinging | habit | trichome | Setaceous or capillate and ejecting an irritating fluid when the apex is dislocated by external pressure, the ejection accomplished by release of existing internal fluid pressure or by contraction of the whole trichome. |
| urn-shaped | = urceolate | solid shape | perianth, calyx, corolla | Having a truncate-ellipsoid tube and a distinct, erect limb, the whole somewhat constricted between tube and limb. See also cotyliform, cyathiform. |
| utricle | nominative | fruit | Dry, indehiscent, one-seeded and with the pericarp thin and free from the seed; derived from a single, superior, simple ovary. | |
| vaginate | = sheathed | architecture | structure | Closely enclosed over some or all of its length by a terete or involute structure. |
Displaying 2551-2575 of 2673