Cycad - Wikipedia
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.
Cycadophyte | Description, Taxonomy, Evolution ...
cycadophyte, any member of a diverse collection of mostly extinct primitive gymnospermous plants. Although some botanists prefer to restrict the term cycadophyte to the members of the division Cycadophyta, three groups of primitive seed plants are discussed here, of which the seed ferns and cycadeoids are represented only by extinct forms.
Cycadophyta - Encyclopedia.com
2018年5月29日 · Cycadophyta (cycads) A division of gymnosperms comprising plants with leaves and habit similar to those of palm trees, although some species are quite small. Cycads are dioecious, and most bear large, coloured, female or male cones.
Cycad | Description, Gymnosperm, Species, Examples, Uses ...
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. Some authorities use the term cycad to refer to all members of the division Cycadophyta.
Cycadophyte - Ancient, Gymnosperms, Pollination | Britannica
Male sporophylls (microsporophylls) are spatulate organs bearing large pollen sacs (microsporangia) in clusters (sori) on their lower (abaxial) surfaces. Up to 200 cubic cm (12 cubic inches) of pollen are produced by a single cone of Cycas rumphii, and some other species produce similar volumes.
8.3: Cycads - Biology LibreTexts
2024年1月31日 · Cycads (Phylum Cycadophyta) Cycads are easy to recognize because they look like a palm tree. However, they bear large cones rather than fruits. Their leaves are quite large compared to the stem and grow out in a rosette around the stem (Figure 8). They can be either male or female, and their cones vary in shape and size, depending on the species.
Cycads - General Characteristics, Life Cycle, Evolution - JRank
The cycads are a relatively small phylum (Cycadophyta) in the plant kingdom Plantae. The cycads are considered to be gymnosperms, because they bear their seeds naked on modified leaves called sporophylls.