CLASSE LILIOPSIDA PDF

Mikarisar Flowers of grasses are borne in an inflorescence or flower head which terminates the liliopskda and other branches of the stem. Roots may also develop from a node where the node comes into contact with the ground as in decumbent and prostrate stems. Switch to new thesaurus. Evolutionary trends in flowering plants.

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Batsch synonym : Liliatae [1] is a botanical name for the class containing the family Liliaceae or Lily Family. It is considered synonymous or nearly synonymous with the name monocotyledon. Publication of the name is credited to Scopoli in : see author citation botany. This name is formed by replacing the termination -aceae in the name Liliaceae by the termination -opsida Art 16 of the ICBN.

Although in principle it is true that circumscription of this class will vary with the taxonomic system being used, in practice this name is very strongly linked to the Cronquist system , and the allied Takhtajan system.

These two are the only major systems to use the name, and in both these systems it refers to the group more widely known as the monocotyledons. Earlier systems referred to this group by the name Monocotyledones, with Monocotyledoneae an earlier spelling these names may be used in any rank.

Systems such as the Dahlgren and Thorne systems more recent than the Takhtajan and Cronquist systems refer to this group by the name Liliidae a name in the rank of subclass. Therefore, in practice the name Liliopsida will almost surely refer to the usage as in the Cronquist system. In summary the monocotyledons were named: Monocotyledoneae in the de Candolle system and the Engler system.

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Liste taxonomique des ordres de la classe Liliopsida

Il nome tradizionale Monocotyledones o, secondo alcuni, Monocotyledoneae deriva dal fatto che la maggior parte dei membri di questo gruppo possiede un solo cotiledone , o foglia embrionale, nei loro semi. Ad ogni modo, le monocotiledoni sono un gruppo distinto. Inoltre, la maggior parte delle monocotiledoni hanno le foglie con nervature parallele parallelinervie , di forma allungata e spesso amplessicauli. Fusti: nelle monocotiledoni, i fasci cribro-vascolari del fusto sono disposti in apparente disordine formando una atactosostele, mentre nelle dicotiledoni sono disposti ad anello tutto intorno al fusto, formando una eustele. Pollini: nelle monocotiledoni, i granuli pollinici sono monocolpati hanno un solco o poro , mentre nelle dicotiledoni ne hanno tre.

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Liliopsida

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