Flora of North America Glossary
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| Term | Synonyms | Category | Limitation | Definition |
|---|---|---|---|---|
| helmet-shaped | = galeate, galeiform | solid shape | Convex overall with a more or less smoothly curved apex, relatively thin-walled and essentially hollow with the interior open to one side below the distal portion; resembling a helmet. See also hood-shaped (cucullate, cuculliform), which overlaps conceptually. | |
| hemianatropous | = amphitropous | orientation | ovule | Having the funiculus adnate to the proximal portion of the (straight) ovule, the latter lying and the micropyle facing parallel to the ovary wall (placenta). |
| hemiepiphytic | habit | plant | Partially epiphytic; rooted in the ground but with stems growing upon and supported mainly by other plants. | |
| hemiparasitic | nutrition | plant | Partially parasitic; facultatively heterotrophic to a limited degree and capable of obtaining a portion of its essential nourishment directly from other living organisms, to which no reciprocal benefit accrues. | |
| hemispheric(al) | solid shape | Half-spheric(al); broadest at the base and uniformly rounded to the apex, circular in any transverse section, and half-circular in any median longitudinal section. | ||
| hepta… | = seven-… | prefix | Indicating presence of or constitution by seven entities of the type denoted by the term's stem; as in heptacolpate, heptafoliolate, heptapterous. | |
| herb | nominative | plant | Annual, biennial, or perennial with no woody (lignified) tissue in any part of the shoot; when persisting over more than one growing season, the parts of the shoot dying back seasonally. | |
| herbaceous 1 | habit | plant | Having no significant degree of secondary growth in any part of the shoot, which thus does not develop woody (lignified) tissue. | |
| herbaceous 2 | texture | Composed entirely of relatively soft, non-woody (unlignified) tissues derived from primary growth. | ||
| hermaphroditic | = bisexual | reproduction | Having functional reproductive structures of both sexes. See also perfect. | |
| hesperidium pl. hesperidia | = citrus fruit | nominative | fruit | A berry derived from a compound ovary and having a thin, firm, leathery rind (exocarp), a thicker, white, spongy wall layer (mesocarp) internal to that, and a fleshy interior (endocarp) that constitutes the bulk of the fruit and is separable into a number of radial sections, each triangular in transsection and consisting of a thin outer membrane surrounding a mass of juicy, unicellular vescicles, among which the seeds are embedded on the adaxial side; esp. in Rutaceae. |
| heteroblastic | < heteromorphic | architecture | plant | Having juvenile and mature leaves that differ distinctly in size and/or shape. |
| heterocephalous | < heteromorphic | architecture | capitulescence, inflorescence | Having heads that differ distinctly in size, shape, and/or constitution. |
| heterocladic | < heteromorphic | architecture | taxon, plant | Having stems that differ distinctly in size, shape and/or constitution, either together on the same plant at the same or different times or segregated on separate plants within the taxon. |
| heterocolpate | architecture | pollen grain | Having long, narrow, regularly disposed lacunae (pseudocolpi). | |
| heterogamous | reproduction | plant, inflorescence | Having flowers that differ distinctly in size, shape and/or constitution. | |
| heteromorphic | > heteroblastic, heterocephalous, heterocladic, heterophyllous, heterostylous | architecture | Occurring in two or more distinctly different forms within the taxon in point, at either the same or different times, in either the same or different plants. | |
| heterophyllous | < heteromorphic | architecture | taxon, plant | Having leaves that differ distinctly in size and/or shape, either on the same plant at the same or different times or segregated on separate plants within the taxon. |
| heteropolar | architecture | pollen grain, spore | Having morphologically evident polarity, the proximal and distal halves dissimilar. | |
| heterosporous | reproduction | taxon | Producing two types of spore, microspore and megaspore, which are sexually distinct and usually different in size, each megaspore giving rise to a megagametophyte, each microspore to a microgametophyte. | |
| heterostylous | < heteromorphic | architecture | taxon, plant, flower | Having styles that differ distinctly in size and/or shape. |
| heterotrophic | nutrition | plant | Dependent upon other organisms for some or all of its essential nourishment, assimilating such materials either directly from the other organisms, living or dead, or from their products. | |
| hexa… | = six-… | prefix | Indicating presence of or constitution by six entities of the type denoted by the term's stem; as in hexandrous, hexacarpellate, hexacolporate. | |
| hilum 1 pl. hila | FEATURE | The scar left on a seed at the point of its abscission from the funiculus. | ||
| hilum 2 pl. hila | FEATURE | The more or less central point within a starch grain of intracellular origin, about which the successive layers of starch were accreted more or less symmetrically. |
Displaying 1101-1125 of 2673