|
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. |
|
pseudoaxillary |
|
position |
|
Only apparently axillary; originally extraaxillary but displaced to the axil by differential growth during development. |
|
pseudobulb |
|
STRUCTURE |
|
An enlarged internode of an aboveground stem, storing water and photosynthate, resembling a bulb; esp. in Orchidaceae. |
|
pseudolamina pl. pseudolaminae |
|
STRUCTURE |
|
The expanded part of a phyllode (phyllodium), resembling a blade but evolutionarily derived from the petiole. |
|
pseudomonadal |
|
arrangement |
pollen |
Apparently monadal but each grain actually comprising an unseparated original tetrad in which the contiguous walls between component grains have dissolved. |
|
pseudopetiolate |
|
architecture |
leaf |
Having a distinctly constricted, more or less stalk-like, proximal portion that is evolutionarily derived from the blade, the original petiole reduced to the point of absence or vestigiality; esp. in Poaceae (Gramineae). |
|
pseudopetiole |
|
STRUCTURE |
|
A distinctly constricted, more or less stalk-like, proximal portion of a leaf, evolutionarily derived from the blade, the original petiole reduced to the point of absence or vestigiality; esp. in Poaceae (Gramineae). |
|
pseudostem |
|
STRUCTURE |
|
A structure that resembles a stem but is not part of the axial system of a shoot, lacking anatomical differentiation into nodes and internodes. |
|
pseudoterminal |
|
insertion |
|
Only apparently terminal; originally subapical but displaced toward the apex by differential growth during development. |
|
pseudoterminal |
|
position |
|
Only apparently terminal; originally subapical but displaced toward the apex by differential growth during development. |
|
psilate |
= bald, glabrous |
pubescence |
|
Lacking trichomes. |
|
pterocaulous |
|
architecture |
plant |
Having alate (winged) stems. |
|
…pterous |
= …winged |
architecture |
|
Having the number of alae (wings) indicated by the prefix; as in dipterous, polypterous, tetrapterous. |
|
puberulent |
|
pubescence |
|
Finely pubescent in the restricted sense of that term. |
|
pubescence |
|
CHARACTER |
|
Collective aspect of trichomes borne on the surface. Many of the terms traditionally used for describing pubescence have been defined and used in so many differing and often contradictory ways that they have become hopelessly ambiguous. This is attributable mainly to overdefinition within this portion of the traditional lexicon — that is, to highly arbitrary and widely variant restriction of a term's scope to some one detailed combination of trichome character states (shape, size, orientation, etc.). By derivation these are essentially general terms, really suited only for denoting overall aspect. The diversity actually encountered in nature defies comprehensive and unambiguous resolution into any limited suite of precisely specified, mutually exclusive, complex character states that can be associated with these terms, which are best used only in their general senses. Sometimes, such description will be sufficient in itself; more often, additionally or alternatively, the various attributes of the individual trichomes should be described. This is the only strategy that allows for full description of any possible condition, including the presence of more than one type of trichome. The various terms used for describing pubescence have never been semantically consistent; in some cases they refer to the trichomes themselves, while in others they apply to the bearing surface or structure; e.g., sericeous (the trichomes themselves are collectively silky) versus barbate (the structure is bearded). See also coating, indumentum (vesture). |
|
pubescent 1 (broad sense) |
|
pubescence |
|
Bearing trichomes. This is one of the most ambiguous terms in the botanical lexicon; it should not be used unless its intended meaning is explicit. |
|
pubescent 2 (strict sense) |
= downy |
pubescence |
|
Of or bearing relatively short, slender, soft, more or less erect, capillate trichomes. See also puberulent. This is one of the most ambiguous terms in the botanical lexicon; it should not be used unless its intended meaning is explicit. |
|
puckered |
= blistered, bullate, pustulate |
relief |
|
Having relatively coarse, irregularly disposed, rounded protrusions or convexities resembling blisters. See also papillate, papillose. |
|
pulley-wheel-shaped |
= trochlear |
solid shape |
|
Discoid (disciform) but with the circumferential surface concave between faces. |
