Flora of North America Glossary
Displaying 1076-1100 of 2673
| Term | Synonyms | Category | Limitation | Definition |
|---|---|---|---|---|
| haplocheilic | = simple-lipped | architecture | stomate | Having subsidiary cells not derived from the primary stoma mother cell and thus not immediately related ontogenetically to the guard cells. |
| haplomorphic | architecture | flower | Having the members of each set of basic floral structures numerous and spirally arranged, the flower hemispheric to conoidal overall. | |
| hard | = indurate(d) | texture | Yielding only under strong pressure; not deformable without internal structural disruption. See also callose (callous), hard-coated (corticate), hard-stemmed (sclerocaulous). | |
| hard-coated | = corticate | texture | Having a hard exterior layer and a distinct, softer interior. | |
| hard-stemmed | = sclerocaulous | texture | plant | Having hard, relatively dry, but essentially herbaceous main stems that contain a significant proportion of sclerotic tissue or fibers. |
| hastate 1 | = halberd-head-shaped | base | laminar structure | Having two generally triangular lobes, one to either side, oriented more or less perpendicular to the central axis. |
| hastate 2 | = halberd-head-shaped | plane shape | Basically triangular with an acute apex and two large, widely divergent basal lobes, each generally triangular and distally acute; like the stylized outline of the broad lateral face of a halberd head. | |
| hastula pl. hastulae, hastulas | = ligule misapplied | STRUCTURE | An outgrowth or enation from the petiole apex at its junction with the adaxial surface of a palmate leaf blade; often woody in texture; variously shaped, its adaxial outline usually resembling an inverted V or U, or a semicircle with the opening proximal; esp. in Arecaceae (Palmae). | |
| haustorium pl. haustoria | STRUCTURE | An absorbing and anchoring organ, often root-like, excrescent from a vegetative part of a parasitic or hemiparasitic plant, by which the plant communicates intimately with and derives sustenance and support from its host plant, into whose tissues the haustorium intrudes. | ||
| head | = capitulum | nominative | inflorescence | Having crowded, sessile or subsessile, small flowers (florets) borne upon an expanded, distally plane or convex, sometimes paleate, compound receptacle (torus), often with a surrounding involucre, and sometimes a subtending calyculus; characteristic of Asteraceae (Compositae). |
| …headed | = …cephalous | architecture | capitulescence, inflorescence | Having the number of heads (capitula) indicated by the prefix; as in three-headed, few-headed, 6-headed. |
| headed 1 | = capitate | architecture | inflorescence | Comprising one or more capitula. |
| headed 2 | = capitate | solid shape | Abruptly enlarged distally to a relatively short, terminal portion that is basically round in transverse section. | |
| headless 1 | = acephalous | architecture | Not terminated or surmounted by a head-like structure, esp. when one might be expected. | |
| headless 2 | = acephalous | solid shape | Not terminating in a head-like portion, esp. when one might be expected. | |
| head-shaped | = capitate, capitiform | solid shape | Basically globose and resembling a head in the context of occurrence. | |
| heart-shaped 1 | = cordate | base | laminar structure | Having two equal, more or less rounded, retrorse lobes, one to either side, overlapping or not, the intervening sinus relatively deep. |
| heart-shaped 2 | = cordate | plane shape | Fairly regularly attenuate from a broad, bilobate base to a narrow apex, the lobes large, rounded, retrorse, and intersecting; like the stylized outline of the broad lateral face of a heart. See also obcordate. | |
| heart-shaped 3 | = cordiform | solid shape | Having two rounded basal lobes, broadest near the base and fairly regularly attenuate to an essentially angular apex; like the stylized form of a heart. See also obcordiform. | |
| heartwood | STRUCTURE | The senescent inner or central portion of the wood (xylem) of an older stem or root, its cells no longer living, in which conduction has ceased and primary reserve materials are no longer stored; often containing terminal metabolic products; usually darker in color than the living, conducting sapwood that encircles it. | ||
| helical 1 | = acyclic, spiral | arrangement | Disposed helically about and along the axis, each on a different radius than the one(s) vertically adjacent. | |
| helical 2 | = spiral | course | Curving with regularly increasing radius from one end to the other in one general plane. | |
| helical 3 | = spiral | course | Curving with constant or regularly increasing radius from one end to the other through three dimensions. | |
| helicoid cyme | = bostryx; > cincinnus | nominative | inflorescence | A cyme in which each axial segment branches to only one side, and all branch to the same side, the whole thus appearing to have an elongate main axis that curves or coils toward its unbranched side. See also scorpioid cyme. |
| helicoid-cymose | > cincinnate | architecture | inflorescence | Comprising one or more helicoid cymes. See also scorpioid-cymose. |
Displaying 1076-1100 of 2673