|
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. |
