|
primary stem |
= main stem; > bole, trunk |
STRUCTURE |
|
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. |
|
primary vein |
> costa, midnerve (not recommended), midrib, midvein, rib; >< lateral vein |
STRUCTURE |
|
A strand belonging to the first order of vasculature in a leaf or other basically laminar structure. See also secondary vein, tertiary vein, veinlet. |
|
primocane |
|
STRUCTURE |
|
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). |
|
prismatic |
|
solid shape |
|
Uniformly polygonal in transverse section, basally and apically truncate, all faces essentially plane. |
|
procumbent |
= prostrate, supine, trailing |
habit |
axis |
Lying directly upon the substrate over its entire length. |
|
prolate |
|
plane shape |
|
Symmetrically elongate parallel to the developmental or polar axis. |
|
prolate |
|
solid shape |
|
Symmetrically elongate parallel to the developmental or polar axis. |
|
proliferous |
|
reproduction |
plant, structure |
Bearing plantlets, as from the leaf margin in some Kalanchoë (Crassulaceae). |
|
prominence |
|
CHARACTER |
|
Elevation or depression of a discrete feature relative to the surrounding surface. |
|
prominent |
< raised |
prominence |
|
Protruding above the general level of the surrounding surface. See also prominulous. |
|
prominulous |
< raised |
prominence |
|
Diminutively prominent, protruding only slightly above the general level of the surrounding surface. |
|
prop root |
|
STRUCTURE |
|
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. |
|
prop-rooted |
|
architecture |
plant |
Bearing and buttressed by prop roots. |
|
prophyll(um) pl. prophylls, prophylla |
= bracteole, bractlet; < bract |
STRUCTURE |
|
A second- or higher-order bract within, and subtending some portion of, an aggregate branching structure, especially when subtending a flower. |
|
prophyllar |
|
insertion |
|
Upon or otherwise directly associated with the prophylls (bracteoles, bractlets). |
|
prophyllar |
|
position |
|
Upon or otherwise directly associated with the prophylls (bracteoles, bractlets). |
|
prostrate |
= procumbent, supine, trailing |
habit |
axis |
Lying directly upon the substrate over its entire length. |
|
protandrous |
= proterandrous; < dichogamous |
maturation |
bisexual flower |
Having the androecium become functionally mature before the gynoecium. |
|
proterandrous |
= protandrous; < dichogamous |
maturation |
bisexual flower |
Having the androecium become functionally mature before the gynoecium. |
|
prothallus pl. prothalli |
|
STRUCTURE |
|
A very diminutive thallus that is reproductively mature and undergoes no further growth; in Polypodiophyta, Pinophyta. |
|
protogynous |
< dichogamous |
maturation |
bisexual flower |
Having the gynoecium become functionally mature before the androecium. |
|
proximal |
> basal |
insertion |
|
Upon or associated with the portion of a structure closest to its developmental origin. |
|
proximal |
> basal |
position |
|
Upon or associated with the portion of a structure closest to its developmental origin. |
|
pruinose |
> caesious, glaucescent, glaucous; < ceraceous, cereous, waxen, waxy |
coating |
|
Covered with a thin, opaque deposit (bloom) of macroscopically indistinguishable waxy particles that rubs off easily. |
|
pseudoaxillary |
|
insertion |
|
Only apparently axillary; originally extraaxillary but displaced to the axil by differential growth during development. |
