A pteridophyte is a vascular plant (with xylem and phloem) that disperses spores.Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of reproduction is hidden. Ferns, horsetails (often treated as ferns), and lycophytes (clubmosses, spikemosses, and quillworts) are all pteridophytes.

Lycopodium (from Greek lykos, wolf and podion, diminutive of pous, foot) is a genus of clubmosses, also known as ground pines or creeping cedars, in the family Lycopodiaceae.Two very different circumscriptions of the genus are in use. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), Lycopodium is one of nine genera in the subfamily …

A bulbil is a small bulb, and may also be called a bulblet, bulbet, or bulbel.. Small bulbs can develop or propagate a large bulb. If one or several moderate-sized bulbs form to replace the original bulb, they are called renewal bulbs. Increase bulbs are small bulbs that develop either on each of the leaves inside a bulb, or else on the end of small underground stems connected to …

L'ethnobotanique, contraction d'ethnologie et de botanique, est l'étude des relations entre l'Homme et les plantes.Son domaine d'étude implique une large gamme de disciplines depuis les recherches archéologiques sur les civilisations anciennes jusqu'à la bio-ingénierie de nouvelles cultures comme le blé. La méthode ethnobotanique part de la connaissance empirique …

In angiosperms, the receptacle or torus (an older term is thalamus, as in Thalamiflorae) is the thickened part of a stem (pedicel) from which the flower organs grow. In some accessory fruits, for example the pome and strawberry, the receptacle gives rise to the edible part of the fruit.The fruit of Rubus species is a cluster of drupelets on top of a conical receptacle.

Etymology. The word "flora" comes from the Latin name of Flora, the goddess of plants, flowers, and fertility in Roman mythology. The technical term "flora" is then derived from a metonymy of this goddess at the end of the sixteenth century. It was first used in poetry to denote the natural vegetation of an area, but soon also assumed the meaning of a work cataloguing such …

Sommaire déplacer vers la barre latérale masquer Début 1 Description 2 Reproduction 3 Répartition géographique 4 Origine et diversité 5 Systématique Afficher / masquer la sous-section Systématique 5.1 Taxonomie 5.2 Classification 6 Phylogénie 7 Records 8 Liste des classes 9 Galerie 10 Notes et références Afficher / masquer la sous-section Notes et références 10.1 …

Les ptéridophytes sont des plantes vasculaires (présentant xylème et phloème) ne produisant ni fleurs ni graines.Ce sont donc des cryptogames vasculaires. Le groupe des ptéridophytes est très étendu et a été introduit en taxonomie systématique en tant que division dans le règne végétal (Plantae), au début de la phylogénie phénétique (par comparaison d'un nombre limité d ...

Polypodiaceae is a family of ferns.In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family includes around 65 genera and an estimated 1,650 species and is placed in the order Polypodiales, suborder Polypodiineae. A broader circumscription has also been used, in which the family includes other families kept separate in PPG I. Nearly all species are …

Une racine pivotante est une racine de plante relativement droite et fuselée à orthogravitropisme positif. Elle forme un pôle à partir duquel d'autres racines poussent latéralement. Les plantes avec des racines pivotantes sont difficiles à déraciner et à transplanter.Leur système racinaire pivotant diffère du système racinaire fasciculé et traçant.