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A thicket of wild cannabis in IslamabadPakistan. Cannabis is an annualdioeciousflowering herb.
The leaves are palmately compound or digitatewith serrate leaflets. At the top of a flowering plant, this number again diminishes to a single leaflet per leaf. Weighing paper lower leaf pairs usually occur in an opposite leaf arrangement and the upper leaf pairs in an alternate arrangement on the main stem of a mature plant.
The leaves have a peculiar and diagnostic venation pattern that enables persons poorly familiar with the plant to distinguish a cannabis leaf from unrelated species that have confusingly similar leaves see illustration.
As is common in Weighing paper leaves, each serration has a central vein extending to its tip. However, the serration vein originates from lower down the central vein of the leaflet, typically opposite to the position of, not the first notch down, but the next notch.
This means that on its way from the midrib of the leaflet to the point of the serration, the vein serving the tip of the serration passes close by the intervening notch.
Sometimes the vein will actually pass tangent to the notch, but often it will pass by at a small distance, and when that happens a spur vein occasionally a pair of such spur veins branches off and joins the leaf margin at the deepest point of the notch. This venation pattern varies slightly among varieties, but in general it enables one to tell Cannabis leaves from superficially similar leaves without difficulty and without special equipment.
Tiny samples of Cannabis plants also can be identified with precision by microscopic examination of leaf cells and similar features, but that requires special expertise and equipment.
Cannabis is predominantly dioecious  having imperfect flowerswith staminate "male" and pistillate "female" flowers occurring on separate plants.
Subdioecy the occurrence of monoecious individuals and dioecious individuals within the same population is widespread. Dioecious varieties are also preferred for textile fiber production, whereas monoecious varieties are preferred for pulp and paper production.
It has been suggested that the presence of monoecy can be used to differentiate licit crops of monoecious hemp from illicit drug crops. Cannabis flower with visible trichomes Male Cannabis flower buds Sex determination Cannabis has been described as having one of the most complicated mechanisms of sex determination among the dioecious plants.
Based on studies of sex reversal in hempit was first reported by K. Hirata in that an XY sex-determination system is present.
A system was first described in Drosophila spp in A system was in use and that furthermore sex was strongly influenced by environmental conditions.
In most cases where the XY system is found it is believed to have evolved recently and independently. Cannabis was one of the first plant species to be karyotyped; however, this was in a period when karyotype preparation was primitive by modern standards see History of Cytogenetics.
Heteromorphic sex chromosomes were reported to occur in staminate individuals of dioecious "Kentucky" hemp, but were not found in pistillate individuals of the same variety.Weighing paper is designed for analytical weighing with minimal influence on analytical results for weighing and transporting sample.
Clean and dust-free Lightweight. An alternative to regular weighing papers as they are much easier to handle Made of grease proof paper that meets FDA 21 CFR (components of paper in contact with aqueous and fatty Related Products: Weigh Boat.
SmartBoats™ Paper Weigh Boats. A truly green solution to sample weighing. These weigh boats are made from FSC® Certified (FSC® Mix) paper (Eco-IN) and will naturally biodegrade when disposed of in the standard waste stream (Eco-OUT).
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