Search results
Results from the WOW.Com Content Network
A conifer cone, or in formal botanical usage a strobilus, pl.: strobili, is a seed-bearing organ on gymnosperm plants, especially in conifers and cycads. They are usually woody and variously conic, cylindrical, ovoid, to globular, and have scales and bracts arranged around a central axis, but can be fleshy and berry -like.
The American Conifer Society was founded in 1983 [1] to help educate the public about conifers, which are cone-bearing plants. [2] The Society is governed by a board of directors with representation from each of the Society's four regions.
The female cone then opens, releasing the seeds which grow to a young seedling. To fertilize the ovum, the male cone releases pollen that is carried in the wind to the female cone. This is pollination. (Male and female cones usually occur on the same plant.) The pollen fertilizes the female gamete (located in the female cone).
A strobilus (pl.: strobili) is a structure present on many land plant species consisting of sporangia-bearing structures densely aggregated along a stem.Strobili are often called cones, but some botanists restrict the use of the term cone to the woody seed strobili of conifers.
Various possible stem-group relatives have been reported from as early as the Late Permian The extinct conifer cone genus Schizolepidopsis likely represent stem-group members of the Pinaceae, the first good records of which are in the Middle-Late Triassic, with abundant records during the Jurassic across Eurasia.
Mechanism to prevent self pollination and allowing compatible pollen to grow a pollen tube for fertilization to take place. Once the pollen grain is recognized and hydrated, the pollen grain germinates to grow a pollen tube. [11] There is competition in this step as many pollen grains may compete to reach the egg.
The spiral leaf arrangement. Athrotaxis cupressoides is an endemic native to Tasmania, Australia. Its distribution is primarily in the central and western mountain areas between 700 and 1300 m above sea level, often around tarns or damp depressions on peaty or wet rocky soils.
Cupressaceae is a widely distributed conifer family, with a near-global range in all continents except for Antarctica, stretching from 70°N in arctic Norway (Juniperus communis) [3] to 55°S in southernmost Chile (Pilgerodendron uviferum), further south than any other conifer species. [4] Juniperus indica reaches 4930 m altitude in Tibet. [5]