Dicotyledones

n.

1.

(Bot.) same as Dicotyledonae.

Thesaurus

Noun

1.

Dicotyledones - comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae class Dicotyledonae, class Dicotyledones, class Magnoliopsida, Dicotyledonae, Magnoliopsida class - (biology) a taxonomic group containing one or more orders liliopsid family, monocot family - family of flowering plants having a single cotyledon (embryonic leaf) in the seed dicot family, magnoliopsid family - family of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination dicot genus, magnoliopsid genus - genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination Angiospermae, Anthophyta, class Angiospermae, division Anthophyta, division Magnoliophyta, Magnoliophyta - comprising flowering plants that produce seeds enclosed in an ovary; in some systems considered a class (Angiospermae) and in others a division (Magnoliophyta or Anthophyta) dicot, dicotyledon, exogen, magnoliopsid - flowering plant with two cotyledons; the stem grows by deposit on its outside Magnoliidae, ranalian complex, subclass Magnoliidae - a group of families of trees and shrubs and herbs having well-developed perianths and apocarpous ovaries and generally regarded as the most primitive extant flowering plants; contains 36 families including Magnoliaceae and Ranunculaceae; sometimes classified as a superorder Myricales, order Myricales - coextensive with the family Myricaceae Aristolochiales, order Aristolochiales - order of plants distinguished by tubular petaloid perianth and inferior ovary Caryophyllidae, subclass Caryophyllidae - a group of families of mostly flowers having basal or central placentation and trinucleate pollen (binucleate pollen is commoner in flowering plants); contains 14 families including: Caryophyllaceae (carnations and pinks); Aizoaceae; Amaranthaceae; Batidaceae; Chenopodiaceae; Cactaceae (order Opuntiales); Nyctaginaceae; Phytolaccaceae; corresponds approximately to order Caryophyllales; sometimes classified as a superorder Asteridae, subclass Asteridae - a group of mostly sympetalous herbs and some trees and shrubs mostly with 2 fused carpels; contains 43 families including Campanulales; Solanaceae; Scrophulariaceae; Labiatae; Verbenaceae; Rubiaceae; Compositae; sometimes classified as a superorder order Primulales, Primulales - Primulaceae; Theophrastaceae; Myrsinaceae; and (in some classifications) Plumbaginaceae Rosidae, subclass Rosidae - a group of trees and shrubs and herbs mostly with polypetalous flowers; contains 108 families including Rosaceae; Crassulaceae; Myrtaceae; Melastomaceae; Euphorbiaceae; Umbelliferae order Proteales, Proteales - coextensive with the family Proteaceae Casuarinales, order Casuarinales - order of chiefly Australian trees and shrubs comprising the casuarinas; 1 family: Casuarinaceae Diapensiales, order Diapensiales - used in some classifications: coextensive with family Diapensiaceae Gentianales, order Gentianales - an order of dicotyledonous plants having gamopetalous flowers; Gentianaceae; Apocynaceae; Asclepiadaceae; Loganiaceae; Oleaceae; Salvadoraceae Oleales, order Oleales - coextensive with the family Oleaceae; in some classifications included in the order Gentianales Hamamelidae, subclass Hamamelidae - a group of chiefly woody plants considered among the most primitive of angiosperms; perianth poorly developed or lacking; flowers often unisexual and often in catkins and often wind pollinated; contains 23 families including the Betulaceae and Fagaceae (includes the Amentiferae); sometimes classified as a superorder Juglandales, order Juglandales - coextensive with the family Juglandaceae Dilleniidae, subclass Dilleniidae - a group of families of more or less advanced trees and shrubs and herbs having either polypetalous or gamopetalous corollas and often with ovules attached to the walls of the ovary; contains 69 families including Ericaceae and Cruciferae and Malvaceae; sometimes classified as a superorder order Urticales, Urticales - an order of dicotyledonous plants including Moraceae and Urticaceae and Ulmaceae order Plantaginales, Plantaginales - coextensive with the family Plantaginaceae order Polygonales, Polygonales - coextensive with the family Polygonaceae, order Salicales, Salicales - coextensive with the family Salicaceae order Sapindales, Sapindales - an order of dicotyledonous plants Ebenales, order Ebenales - trees or shrubs of the families Ebenaceae or Sapotaceae or Styracaceae or Symplocaceae