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pollen sac |
= theca |
STRUCTURE |
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Any of the one, two or four ontogenetically distinct, pollen-producing sectors (microsporangia) of an anther. In some taxa the walls between pairs of adjacent thecae break down as an anther approaches maturity, the mature anther thus ultimately containing half as many locules as thecae. |
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pollinarium pl. pollinaria |
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STRUCTURE |
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A pollinium together with, when present, its stipe and viscidium; the entire unit of pollinium dispersal. |
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pollinial |
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arrangement |
pollen |
Polyadal with the grains of individual thecae (pollen sacs), or of fused thecae, compacted and forming tightly coherent masses (pollinia) that constitute the basic dispersal units, these sometimes distally attenuate to a sterile caudicle (translator arm), sometimes united by caudicles in groups of two or more, the caudicle(s) sometimes attached to a viscidium, either directly or through an intervening stipe; esp. in Asclepiadaceae, Orchidaceae. |
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pollinium pl. pollinia |
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STRUCTURE |
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A mass of coherent pollen grains disseminated as a unit by adhering to a pollinating insect, representing the entire content of a single theca or of fused thecae; often distally attenuate to a sterile caudicle (translator arm), which may attach to a viscidium, either directly or through an intervening stipe; esp. in Asclepiadaceae, Orchidaceae. |
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poly… |
= many-…, multi…, pluri… |
prefix |
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Indicating presence of or constitution by a relatively large number of entities of the type denoted by the term's stem; as in polyadelphous, polyandrous, polycarpellate. See also entries for particular terms with this prefix whose meanings, at least in some applications, are more specific than usually indicated by such combination;and also oligo… (few-…). |
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polyadal |
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arrangement |
pollen |
Shed in groups of more than four, each group comprising grains from two or more original tetrads, the latter intact or not. |
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polycarpic |
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reproduction |
plant |
Normally fruiting repeatedly prior to senescence. |
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polygamodioecious |
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reproduction |
taxon |
Basically dioecious but with some plants bearing some bisexual flowers. |
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polygamomonoecious |
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reproduction |
taxon |
Basically monoecious but with some or all plants bearing some bisexual flowers. |
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polygamous |
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reproduction |
taxon |
Having both bisexual and unisexual flowers, borne on the same or on different plants. |
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polypetalous |
= apopetalous, choripetalous, dialypetalous |
architecture |
flower, perianth, corolla |
Having two or more distinct petals; having the petals unfused. |
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polyplicate |
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architecture |
pollen grain |
Inaperturate with meridional folds, thus appearing longitudinally wrinkled. |
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polysepalous |
= aposepalous, chorisepalous, dialysepalous |
architecture |
flower, perianth, calyx |
Having two or more distinct sepals; having the sepals unfused. |
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polytomous |
= flabelliramous |
architecture |
axis |
Branching by division of the apical meristem producing more than three coordinate but not necessarily equal derivatives from each division. |
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pome |
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nominative |
fruit |
Indehiscent with accessory floral tube tissue adnate to the pericarp; derived from a single, inferior, compound ovary; the exterior thick and fleshy, the interior consisting of several locules bounded by cartilaginous tissue; in Rosaceae. |
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…porate |
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architecture |
pollen grain |
Having the number of pores indicated by the prefix; as in monoporate, polyporate, triporate. |
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pore |
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FEATURE |
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A small aperture or opening in a wall or covering that allows transport between interior and exterior. |
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poricidal |
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dehiscence |
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Forming one or more apertures in the exterior wall, usually apically or sub-apically, through which the contents pass to the outside. |
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porosity |
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CHARACTER |
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Presence and disposition of vessels (pores) in wood (xylem). |
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porous |
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porosity |
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Having vessels present. |
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porrect |
= patent, salient, spreading |
orientation |
lateral structure |
Antrorse and diverging at an acute angle from the bearing structure. |
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position |
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CHARACTER |
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Location or disposition with reference to some dissimilar structure(s) or larger context. The lexicons relating to position and insertion overlap to a great degree, since these two morphological concepts are often inseparable in practice. Also overlaps conceptually with arrangement, habit, orientation, and shape. |
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pouch-shaped |
= bag-shaped, saccate, sack-shaped |
solid shape |
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Irregularly obovoid with an exterior aspect intermediate between inflated and flaccid; like a closed pouch or bag. |
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powdery |
= granuliferous, pulverulent |
coating |
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Covered with a more or less even deposit of fine, dry particles. See also dusty (lentiginose, lentiginous), which is not clearly distinct in its application. |
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praemorse |
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apex |
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Truncate with the distal margin irregular or ragged, as if chewed. |
