Cycads / ˈsaɪkædz / are seed plants that typically have a stout and woody (ligneous) trunk with a crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, that is, individual plants of a species are either male or female. Cycads vary in size from having trunks only a few centimeters to several meters tall.

cycad, (order Cycadales), any of the palmlike woody gymnospermous plants that constitute the order Cycadales. The order consists of three extant (not extinct) families—Cycadaceae, Stangeriaceae, and Zamiaceae—which contain 10–11 genera and about 310 species.

In this article we will discuss about Cycadales. After reading this article you will learn about: 1. Meaning of Cycadales 2. General Characters of Cycadales 3. Genera 4. Phylogency.

May 29, 2024 · Cycadales is a gymnospermic order. Members of this order are mostly inhabitants of tropical and subtropical regions. It includes both living and fossil genera. They originated in the Mesozoic era and continued up to the Jurassic and Cretaceous periods. Only …

The World List of Cycads (WLoC) is a comprehensive reference for cycad taxonomy, nomenclature, biology, and literature. Learn more about us. The WLoC is produced under the auspices of the IUCN/SSC Cycad Specialist Group (CSG) and …

Cycads (order Cycadales) are an ancient group of palmlike gymnosperms with about 300 extant species across three families. The plants are distinguished by crowns of large pinnately compound leaves and by large cones. Several species are grown as ornamentals.

Feb 22, 2025 · Woody, long-lived, unisexual plants. Main roots thickened, fleshy, often tuberous. All species have coralloid roots that are N-fixing due to symbiotic blue-green algae; many species also form vesicular-arbuscular mycorrhizas (Jones 1993; Brundrett 2008 and citations therein). Stems may be underground or emergent.

The Cycadophyta (also known as Cycadales), or cycads, are a relatively ancient group of plants that were once much more common than today and served as fodder for plant-eating nonavian dinosaurs. Extant cycads are now fairly restricted in distribution, consisting of approximately 210–250 species in 11 genera.

Jul 14, 2022 · Las cícadas (Cycadophyta) son un grupo de plantas sobrevivientes del primer grupo de especies seminíferas primitivas del Paleozoico tardío. Son consideradas fósiles vivientes, pues en la actualidad conservan los mismos caracteres de las plantas prehistóricas.

Jun 29, 2023 · Cycads (order Cycadales) are an evolutionarily very old and once very diverse group of palm-like plants that were widespread worldwide at the time of the dinosaurs. Now their distribution is limited to subtropical regions of the earth with low latitudes, and some of them have been considered as “living fossils”.