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present |
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presence |
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Occurring within the context in point. |
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prickle |
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STRUCTURE |
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Any unvascularized spine-like enation originating in the epidermis, cortex, or mesophyll of any shoot part. See also spine, thorn. |
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prickly |
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architecture |
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Bearing prickles. |
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primary axis |
> ray |
STRUCTURE |
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A main or first-order axis within any specified, uniformly delimited structural context. |
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primary root |
> taproot |
STRUCTURE |
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The one, central root directly basal to a shoot, developing directly from the embryonic radicle; the first-formed root of a plant, being the only one truly central in nature (i.e., belonging to the original central axis of the plant). All other roots of a plant develop subsequently and are lateral in nature. The primary root may be permanently dominant, developing into a taproot; otherwise it may be transitory or become functionally subordinate, with secondary and/or adventitious roots becoming dominant. |
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primary stem |
= main stem; > bole, trunk |
STRUCTURE |
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The one, or any of the more than one, first-order stem(s), or first-order portion(s) of the collective stem, of a shoot. |
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primary vein |
> costa, midnerve (not recommended), midrib, midvein, rib; >< lateral vein |
STRUCTURE |
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A strand belonging to the first order of vasculature in a leaf or other basically laminar structure. See also secondary vein, tertiary vein, veinlet. |
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primocane |
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STRUCTURE |
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A biennial or perennial stem before it has begun flowering, when the latter does not occur until at least its second season of growth; esp. in Rubus (Rosaceae). |
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prismatic |
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solid shape |
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Uniformly polygonal in transverse section, basally and apically truncate, all faces essentially plane. |
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procumbent |
= prostrate, supine, trailing |
habit |
axis |
Lying directly upon the substrate over its entire length. |
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prolate |
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plane shape |
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Symmetrically elongate parallel to the developmental or polar axis. |
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prolate |
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solid shape |
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Symmetrically elongate parallel to the developmental or polar axis. |
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proliferous |
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reproduction |
plant, structure |
Bearing plantlets, as from the leaf margin in some Kalanchoë (Crassulaceae). |
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prominence |
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CHARACTER |
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Elevation or depression of a discrete feature relative to the surrounding surface. |
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prominent |
< raised |
prominence |
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Protruding above the general level of the surrounding surface. See also prominulous. |
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prominulous |
< raised |
prominence |
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Diminutively prominent, protruding only slightly above the general level of the surrounding surface. |
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prop root |
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STRUCTURE |
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A relatively stout adventitious root arising from the lower portion of a main stem and extending outward and downward toward the substrate, within which it ultimately becomes anchored, thus buttressing the aboveground portion of the plant. |
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prop-rooted |
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architecture |
plant |
Bearing and buttressed by prop roots. |
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prophyll(um) pl. prophylls, prophylla |
= bracteole, bractlet; < bract |
STRUCTURE |
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A second- or higher-order bract within, and subtending some portion of, an aggregate branching structure, especially when subtending a flower. |
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prophyllar |
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insertion |
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Upon or otherwise directly associated with the prophylls (bracteoles, bractlets). |
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prophyllar |
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position |
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Upon or otherwise directly associated with the prophylls (bracteoles, bractlets). |
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prostrate |
= procumbent, supine, trailing |
habit |
axis |
Lying directly upon the substrate over its entire length. |
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protandrous |
= proterandrous; < dichogamous |
maturation |
bisexual flower |
Having the androecium become functionally mature before the gynoecium. |
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proterandrous |
= protandrous; < dichogamous |
maturation |
bisexual flower |
Having the androecium become functionally mature before the gynoecium. |
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prothallus pl. prothalli |
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STRUCTURE |
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A very diminutive thallus that is reproductively mature and undergoes no further growth; in Polypodiophyta, Pinophyta. |