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Glossary of terms used on this site

There are 98 entries in this glossary.
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Term Definition
Ovate

A term used for outlines and plane shapes, with length: breadth ratio is 2.5:1 - 3:2, broadest below the middle, see broadly, broad-transverse, narrowly, transverse, cf. elliptic, oblong, obovate, rhombic, triangular, trullate; ovoid, egg-shaped, is ovate in three dimensions and with a rounded apex and base, cf. pyriform.

Palea

In a grass floret, the upper of the two "bracts" enclosing a flower, possibly a prophyll/bracteole, perhaps more likely representing two connate perianth members of the outer whorl, cf. glume (of a spikelet), lemma, lodicule.

Panicle

Of an inflorescence, a compound raceme, an indeterminate inflorescence in which the flowers are borne on branches of the main axis or on further branches of these, adj. paniculate, indeterminate and much branched, cf. also botryoid, corymb, fascicle, spadix, spike, thyrse, umbel.

Pappus

A tuft of hairs on a fruit; in Asteraceae, a tuft (or ring) of hairs or scales borne above the inferior ovary and outside the corolla and possibly representing the calyx.

Patelliform

Shaped like the patella; pan-shaped.

Patent

Erect.

Peduncle

That part of the axis of an inflorescence below the insertion of any flowers or inflorescence branches and above the uppermost node with a foliage leaf or leaves, loosely, the “stalk” of the inflorescence, and in that sense to be compared with the pedicel, the “stalk” of the flower, see also scape, cf. inflorescence axis, rachilla, sculpture elements.

Petiole

The stalk of a leaf, i.e. that part below the blade or, if the leaf is compond, below the point of insertion of the leaflets and/or beginning of the rachis, cf. hyperphyll, lamina, leaf base, stipule, Vorläuferspitze.

Phyllary

Inflorescence bract of an involucre, as in Asteraceae.

Pilous

Covered with hairs especially fine soft ones.

Polycarpic

Capable of flowering and fruiting an indefinite number of times.

Pseudopetiole

Often used when describing monocot leaves which appear to have a petiole.

Pubescent

Covered with short, soft, erect hairs, cf. arachnoid, arbuscular, canescent, hirsute, hispid, lepidote, puberulous, sericeous, stellate, strigose, tomentose, T-shaped, villous.

Raceme

An indeterminate inflorescence, the axis producing a series of flowers on lateral pedicels, the oldest at the base and the youngest at the top, adj. racemose, for variants, see botryoid, corymb, fascicle, raceme, spadix, spike, thyrse, umbel, cf. cyme.

Receptacle

The axis of a flower on which the perianth, androecium and gynoecium are borne; in Asteraceae, used to refer to the often swollen and apically flattened part of the stem bearing the flowers and inflorescence bracts.

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Mauricio Diazgranados @ 2013. Postdoctoral researcher | Botany | NMNH | Smithsonian Institution 
Website: http://www.mauricio-diazgranados.com/ | Email: espeletias@gmail.com
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