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Glossary of terms used on this site

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Term Definition

Ash-grey, as of wood ash.


The base of the hypocotyl, sometimes marked by an external line or a swollen area and/or bearing collar rhizoids adjoining and hypocotyl in the embryo or seedling, see epiblast, periblast, also cotyledon, eophyll, epicotyl, mesocotyl, plumule, primary leaf, of a monocot seedling, see also mesocotyl, coleorhiza, hyperphyll (apocole, haustorium/scutellum, phanomer), hypophyll (cotyledonary sheath, coleoptile).


Of axillary branching, a kind of metatopic growth where the bud as it were shifted up the stem, being fused with the axis that bears it, the result is that it is borne way above the subtending leaf, cf. recaulescent, also epicaulescent.


Having a surface or boundary that curves or bulges outward, as the exterior of a sphere.


Leathery in texture, cf. chaffy, chartaceous, papyraceous, scarious.


The petals of a flower collectively, cf. androecium, calyx, gynoecium, perianth.


A racemose inflorescence in which the pedicels of the lower flowers are longer than those of the flowers above, bringing all flowers to about the same level, cf. botryoid, fascicle, raceme, spadix, spike, thyrse, umbel.


Of margins with small, rounded teeth or scalloped, dim. crenulate, cf. biserrate, dentate, entire, serrate, sinuate, undulate.


Wedge-shaped, the sides straight and coming to a point, the angle made being less than 90o, cf. acute, attenuate, acumen, apiculum, arista, awn, caudate, cuspidate, emarginate, mucronate, muticous, obtuse, retuse, rounded, truncate, cf. also cordate, hastate, oblique, runcinate, sagittate (esp. of lamina base).


Of an sympodial inflorescence, with the apex of the stem axis converted into a flower, but further flowers arising successively from the axils of the bracteole/prophyll (monocots) or bracteoles/prophylls (most BLAs) immediately below it, and so on, adj. cymose, a cymule is a diminutive cyme, often used for part of an inflorescence, usually few-flowered, see dichasia and monochasia (basic types), and drepanium, helicoid cyme, rhipidium, scorpioid cyme (variants), and bicolor unit and cyathium (modifications in particular families), see also botryoid, corymb, fascicle, cf. raceme.


A dry, indehiscent, one-seeded fruit formed from an inferior ovary, an achene s.l., cf. also caryopsis, nut, utricle.


Triangular, with the sides of about equal length, deltate.


Of margins, with symmetrical teeth pointing laterally, denticle, a small tooth, denticulate, cf. biserrate, crenate, entire, serrate, sinuate, undulate.


A cymose inflorescence with opposite branching below the flower which terminates each axis, each branch in turn terminating in a flower, etc., adj. dichasial, see fascicle, verticillaster, cf. monochasium, pleiochasium.


A plate or rim of tissue, whether or not lobed or interrupted, derived from the receptacle of a flower, occurring between whorls of floral parts, commonly found between the androecium and gynoecium or on top of the gynoecium when the ovary is inferior, and typically secreting nectar-shaped.

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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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