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Glossary of terms used on this site

There are 98 entries in this glossary.
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Term Definition

The blade of a leaf, usually flattened, dorsiventral, and expanded, often with a midrib, cf. hyperphyll, leaf base, petiole, stipule, Vorläuferspitze, see admedial, exmedial (positional terms); the lamina margin often with teeth, see also biserrate, crenate, dentate, entire, serrate, sinuate, undulate, see also venation.


Woolly; covered with something resembling wool


Tapering from a rounded base toward an apex; lance-shaped: lanceolate leaves.


A membranous or hairy appendage on the adaxial surface of a bifacial leaf, at the junction between sheath and blade, especially in grasses, or a similar structure at the junction of two parts of a petal, e.g. claw and limb (see also corona); also, an adaxial appendage near the leaf base in some monocots and in Selaginellaceae, etc.; adj. ligulate.


Very narrow in relation to the length, and with the sides parallel.


Of the apex of any laminar structure, e.g., petal, leaf blade, divided more than 25% the length of the structure, cf. emarginate, retuse.


(Of flowering with respect to architecture), plant flowering and fruiting only once during its lifespan, e.g. Corypha, cf. hapaxanthic, pleonanthic, also iteroparous, plietesial, semelparous, cf. (of plant duration) annual, biennial, ephemeral, perennial.


Of a cymose inflorescence, with branches arising from only one of each pair or bracteoles/prophylls, or from the single bracteole/prophyll, adj. monochasial, see bicolor unit, drepanium, helicoid cyme, rhipidium, scorpioid cyme, cf. dichasium.


Of growth, with a persistent terminal growing point producing many lateral organs successively, thus a monopodial stem grows in this way, see also indeterminate, racemose (of inflorescences), cf. sympodial.


A sharp, abrupt terminal point, adj. mucronate.


A term used for outlines and plane shapes, with length:breadth ratio 2:1 - 3:2, the sides almost parallel, see broadly, broad-transverse, narrowly, transverse, cf. elliptic, obovate, ovate, rhombic, triangular, trullate.


A term used for outlines and plane shapes, with length:breadth ratio 2.5:1 - 3:2, the broadest part is above the middle, see broadly, broad-transverse, narrowly, transverse, cf. elliptic, oblong, ovate, rhombic, triangular, trullate.


Egg-shaped and solid, with the narrow end attached to the stem.


Yellowish white; having a faint tint of dingy yellow.


Circular or nearly so.

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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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