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The male cycad develops 1 to 5 male cones, each cone measuring 12 cm to 28 cm in length and 4 cm to 7 cm in diameter. These cones are fusiform but curve with age and remain green throughout its lifetime. The female cycad develops 1 to 3 female cones, each cone measuring 25 cm to 40 cm in length and 10 cm to 15 cm in diameter. The female cone ...
The flower-like williamsoniacean male reproductive structure Weltrichia is associated with the female reproductive structure Williamsonia, though it is uncertain whether the parent plants were monoecious (male and female reproductive structures being present on the same plant) or dioecious (where each plant has only one gender of reproductive ...
Cycadothrips is a genus of thrips first discovered on the male cones of the cycad Macrozamia communis in New South Wales. They pollinate cycads which are mostly evolved for wind-pollination. The thrips transport pollen from the male cones to the female cones on separate plants.
For one, both male and female cycads are gymnosperms and bear cones (strobili), while palms are angiosperms and so flower and bear fruit. The mature foliage looks very similar between both groups, but the young emerging leaves of a cycad resemble a fiddlehead fern before they unfold and take their place in the rosette, while the leaves of palms ...
Pelvimetry is the measurement of the female pelvis. [1] It can theoretically identify cephalo-pelvic disproportion, which is when the capacity of the pelvis is inadequate to allow the fetus to negotiate the birth canal. However, clinical evidence indicate that all pregnant women should be allowed a trial of labor regardless of pelvimetry results.
Male and female sporophylls are spirally aggregated into determinate cones that grow along the axis. Female sporophylls are simple, appearing peltate, with a barren stipe and an expanded and thickened lamina with 2 (rarely 3 or more) sessile ovules inserted on the inner (axis facing) surface and directed inward.
This listing contains taxa of plants in the division Cycadophyta, recorded from South Africa. Cycads / ˈ s aɪ k æ d z / are seed plants with a very long fossil history that were formerly more abundant and more diverse than they are today. They typically have a stout and woody trunk with a crown of large, hard and stiff, evergreen leaves.
Cycads are dioecious, meaning that there are separate male and female plants, and the female produces seeds while the male produces pollen. Plants of this taxon have generally been considered to be wind pollinated, but several recent studies suggest that insect pollination is more likely. The seeds produced are typically large with a hard ...