Search results
The Gymnosperm Phyla. The four phyla of living gymnosperms are of separate clades or lineages, unlike the angiosperms, which are a monophyletic, single lineage. “Gymnosperm” means “naked seed” and the name draws attention to the ovules and resulting seeds that are exposed openly on the megasporophylls. The conifers are woody, mostly ...
Apr 16, 2018 · To map gymnosperm diversity, data from the World Checklist of Selected Plant families 17 (accessed 30 August 2016) were matched to the Taxonomic Databases Working Group (TDWG) geographical scheme ...
Gymnosperms. Gymnosperms were the first seed-bearing plants to appear on Earth. The seeds of gymnosperms (typically shed from scales arranged in cones) provided protection for developing embryos and allowed them to remain viable for a long time. Compared to non-seed plants around them, gymnosperms attained a reduced reliance on growing in very ...
From their humble and still obscure beginning during the early Jurassic period, the angiosperms—or flowering plants—have evolved to dominate most terrestrial ecosystems ( Figure 26.13 ). With more than 300,000 species, the angiosperm phylum (Anthophyta) is second only to insects in terms of diversification.
Gymnosperms, meaning “naked seeds,” are a diverse group of seed plants. According to the "anthophyte" hypothesis, the angiosperms are a sister group of one group of gymnosperms (the Gnetales), which makes the gymnosperms a paraphyletic group. Paraphyletic groups are those in which not all descendants of a single common ancestor are included ...
Jul 1, 2022 · Gymnosperms constitute one of the four major groups of land plants (the other three being bryophytes, ferns and fern allies, and angiosperms) and possess some characters similar to ferns (e.g., circinnate young leaves in Cycas L., and presence of archegonia in female gametophytes and spermatozoids in cycads and Ginkgo L.), as well as ...
Gymnosperms can grow into magnificent structures and are the largest, tallest and oldest organisms on Earth. Within the gymnosperm clade, there are 4 groups of trees; gingko, gnetophyta, cycads and the largest and most diverse group – the conifers. The gymnosperms were for a long time the dominant plants on Earth but have been overthrown ...
