• Acaulescent: stemless, or with a stem which interleave is extremly reduced.
  • Adventitious: organ not growing at its usual place. ex: adventitious root on a stem.
  • Androecium: sum of the male floral parts.
  • Annulus: annular outgrowth on Stapeliae's corolla.
  • Anther: male element, bulge on top of a stamen containing pollen.
  • Apex: top or tip of an organ (stem, root, leave…).
  • Aphyllous: without leaves.


  • Bulbil: small plant produced in an asexual manner, designed to separate itself from the plant it is borne by, and continue its growth as a new individual. ex.: Kalanchoe daigremontiana.
    Can also designate the small bulbs growing around a main bulb. ex.: Ornithogalum caudatum.


  • Caudex: basal part of the stem and/or the root, variously bulging, serving to stock the reserves necessary for survival during dry period.
  • Caudiciform: which stem and/or root basal part is bulged in a caudex.
  • Cespitose: growing in tufts; forming mats or tufts; often refers to a short plant with many stems or branches, forming a cushion appearance.
  • Clavate: club-shaped, gradually thickening from a slender base.


  • Dehiscent: organ opening spontaneously at maturity (usually fruits). (Antonyme: indehiscent)


  • Endemic: taxonomic group (form, variety, species, genus etc.) encountered in spontaneous state in a given area and only in this one.
  • Epigeal / Epigeous: organ developing overground.


  • Follicle: dehiscent dry fruit, formed by an isolated carpel opening through a single cleft along the suture line.


  • Gynoecium: sum of the female floral parts ; syn.: pistil.
  • Geophytic: kind of perennial plant, having one or more stock organ(s), bulb, rhizome, tuber(s), …, burried in the ground, permitting to the dry season. Ex.: Cyclamen spp., Euphorbia primulæfolia, Pachypodium bispinosum & succulentum, Raphionacme spp., …


  • Habitat: environment in which a plant lives, including all environmental factors.
  • Hypogeous: underground organs of a plant, most often roots but sometimes also fruits. (Antonyme: epigeous)
  • Hysteranthous: whose foliage develops after flowering. (Antonym: synanthous)


  • Infundibuliform: funnel shaped.


  • Meristem: vegetative tissue formed by undifferentiated cell groups often localized at the tip of generator organs, which proliferate and divide actively.
  • Monocarpic: which blooms and fructify just once before dying.


  • Napiform: which has the shape of /which grows as, the turnip (Brassica rapa L.).


  • Pachycaul: which main stem is variously swollen. (Antonym: leptocaul).
  • Protandrous: said of a flower, anther's maturity before stigma's one.
  • Protogynous: said of a flower, stigma's maturity before anther's one.


  • Rhizomatous: from the greek rhizôma, roots tuft. Underground perennial stem, generally more or less horizontal, sending roots and shoots.


  • Sepal: foliate part of a flower, usually green, of which one or more are  forming the calyx which stands the corolla of a flower.
  • Sessile: which is not provided with petiole - for a leaf, or peduncle - for a flower.
  • Stolon: spindly and elongated stem, aerial or below ground level, produced from the base of a plant, from which, an autonomous plantlet with identical genitical code, grows at its tip.


  • Tuber: underground bulge of the root or stem, used as nutritive reserve and provided with buds which will give rise to new leafy stems.