Flora of North America Glossary
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| Term | Synonyms | Category | Limitation | Definition |
|---|---|---|---|---|
| pinna pl. pinnae | < leaflet | STRUCTURE | One of the first-order divisions or leaflets of a pinnate frond; in Polypodiophyta. See also pinnule. | |
| …pinnate | architecture | foliaceous structure | Compound with the number of orders of leaflets indicated by the prefix, each order pinnate; as in bipinnate, tripinnate. | |
| pinnate | > pinnatifid, pinnatisect | architecture | foliaceous structure | Compound with one order of leaflets inserted at different points along and to either side of the axis, from which those on each side diverge more or less in parallel; or lobed (cleft, divided, parted, segmented), incised or ribbed in a similar, feather-like pattern. Unless qualified to indicate otherwise, this term usually is understood to mean "pinnately once-compound." See also imparipinnate, palmatipinnate, paripinnate, …pinnate, pinnatifid. |
| pinnatifid | > pinnatisect; < pinnate | plane shape | Pinnately divided. | |
| pinnatifid | > pinnatisect; < pinnate | solid shape | Pinnately divided. | |
| pinnatisect | < pinnate, pinnatifid | plane shape | Pinnately divided with the sinuses extending to the central axis. | |
| pinnatisect | < pinnate, pinnatifid | solid shape | Pinnately divided with the sinuses extending to the central axis. | |
| pinnule | < leaflet | STRUCTURE | A second- or higher-order division or leaflet of a pinnate frond; a division of a pinna; in Polypodiophyta. | |
| pistil | > carpel | STRUCTURE | Any simple or compound, discrete or histologically distinct, female (ovule-producing) floral structure, or any putatively homologous sterile structure; comprising an ovary and one or more stigmas borne either directly upon the ovary or upon one or more intervening styles. See also gynoecium. | |
| …pistillate | = …gynous, …pistilled | architecture | flower, gynoecium | Having the number of pistils indicated by the prefix; as in tripistillate. |
| pistillate | = carpellate (not recommended) | architecture | inflorescence, flower, floret | Having functional pistils but no functional stamens, thus unisexual and female. |
| …pistilled | = …gynous, …pistillate | architecture | flower, gynoecium | Having the number of pistils indicated by the prefix; as in three-pistilled. |
| pistillode | = pistillodium | STRUCTURE | Any sterile structure deemed to represent a modified pistil, homology being inferred on the basis of structural similarity, ontogeny, and/or position; sometimes nectariferous, sometimes connate with others or adnate to other floral structures. | |
| pistillodium pl. pistillodia | = pistillode | STRUCTURE | Any sterile structure deemed to represent a modified pistil, homology being inferred on the basis of structural similarity, ontogeny, and/or position; sometimes nectariferous, sometimes connate with others or adnate to other floral structures. | |
| pit | = fovea, scrobis | FEATURE | A small, rounded depression. | |
| pitcher | = ascidium, pitcher blade | STRUCTURE | A pitcher-shaped (ascidiform) leaf blade, sometimes lidded (operculate), usually carnivorous; esp. in Nepenthaceae, Sarraceniaceae. | |
| pitcher-blade | = ascidium, pitcher | STRUCTURE | A pitcher-shaped (ascidiform) leaf blade, sometimes lidded (operculate), usually carnivorous; esp. in Nepenthaceae, Sarraceniaceae. | |
| pitcher-bladed | = ascidiate | architecture | leaf | Having a pitcher-shaped (ascidiform) blade; esp. in Nepenthaceae, Sarraceniaceae. |
| pitcher-leaved | = ascidiate | architecture | plant | Bearing pitcher-bladed (ascidiate) leaves; esp. in Nepenthaceae, Sarraceniaceae. |
| pitcher-shaped | = ascidiform | solid shape | Having a more or less tubular, radially or bilaterally symmetrical body closed at the base and broadening toward a more or less open apex sometimes lidded or overarched by a prolongation of one side; like a pitcher. | |
| pith | STRUCTURE | The central ground tissue of a stem or, when present, of a root, consisting of thin-walled parenchyma cells; distinct and more or less soft and spongy relative to the other tissues of the axis; sometimes partly or wholly degenerating after secondary growth has begun. | ||
| pithy | = medullose | texture | Loose or spongy internally, denser and firmer externally. | |
| pitted | = foveate | relief | Having numerous, small, rounded depressions. See also fine-pitted (foveolate, scrobiculate). | |
| placenta pl. placentae, placentas | STRUCTURE | An ovule-bearing zone of the tissue surface bordering an ovary locule; of merely topographic, not histological, significance; may be a part of the ovary wall proper or an extension from it, or a part of the central axis of the ovary or an extension from it. | ||
| placenta-shaped | = placentiform | solid shape | Thickly discoid (disciform); like the generalized form of a human placenta. |
Displaying 1726-1750 of 2673