Cycas: Distribution, Reproduction and Economic Importance.
Cycas is strickly a dioecious plant, but the male and female plants are indistinguishable at the vegetative stage. The compact male cone develops at the apex of the stem in the male plant. However, Cycas is the only genus of Cycadaceae which does not produce any female cone.
Cycas sporophyte is an evergreen palm-like tree that attains a height of 0.4 to 2.0 mt. Sporophyte is dioecious i.e. male and female plants are separate. Both the plant body is differentiated into roots, stem and leaves (Fig. 9.2).
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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.
Unlike in non-vascular plants, the dominant phase of the plant life cycle for vascular plants is the sporophtye generation. In gymnosperms, the plant sporophyte is recognized as the bulk of the plant itself, including roots, leaves, stems, and cones. The cells of the plant sporophyte are diploid and contain two complete sets of chromosomes.
Cycas is a palm-like, evergreen plant (Fig. 8.8). Prior to the anatomical studies of the stem of Cycas revoluta by Brongniart (1829), the Cycas was actually considered a palm. The plant body consists of a columnar aerial trunk with a crown of pinnately compound leaves as its top.
If you're seeking flora that's as old as the ages, look no further than a group of plants known as cycads. Around since before the time of dinosaurs, cycads feature stout, woody trunks topped by.
Cycas, a genus of 105 species of palmlike tropical and subtropical ornamental cycads (family Cycadaceae), among them trees 12 metres (40 feet) or more in height. Their leaves are dark green and circinate (uncoiling as fern leaves do), differing from those of other members of the family in having a midrib but no lateral veins.
The fossilized trunks of these plants display scattered strobili among leaf bases of the characteristic armour. Fossil cycadeoids are widespread but are especially abundant in the Black Hills region of South Dakota. Earlier in the Mesozoic Era, cycadeoids of a more slender, branching form, exemplified by Williamsonia, were abundant.
Cycas is a very ancient genus of trees. The group achieved its maximum diversity in the Jurassic and Cretaceous periods, when it was distributed almost worldwide. At the end of the Cretaceous, when the non-avian dinosaurs became extinct, so did most of the cycas in the Northern Hemisphere. 1 Range.
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Physical Characteristics Cycas revoluta is an evergreen Tree growing to 3.5 m (11ft) by 3.5 m (11ft) at a slow rate. It is hardy to zone (UK) 9 and is frost tender. It is in leaf all year, in flower from May to July, and the seeds ripen from October to November.
If you enter just a plant name, you will see results from the old RHS Plant Finder and Selector databases; If you select any attributes with or without a plant name, you will see a much narrower selection of results taken only from the old RHS Plant Selector database. These plants will have a lot more details displayed including an image.
