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- W1574609773 abstract "1.1 Broad outline of the genus Pinus Pines are the most important group of conifers. The genus Pinus emerged between Late Jurassic to Early Cretaceous period more than 150 million years ago (Gernandt et al., 2008). Like other conifers, pine trees are characterized by naked ovules, i.e. not protected inside an ovary. Because of this trait, pine trees do not have true fruits, bearing instead structures called cones (Arber & Parkin, 1907; Cronquist, 1968). Pines are distinguished from other conifers by needle-shaped leaves (aciculae), usually in clusters of 2 to 5, forming structures called fascicles (Farjon & Styles, 1997). Several groups of coniferous trees are well represented in Mexico (Rzedowski, 1978). According to Martinez (1948), Farjon (1996) and Farjon & Styles (1997), Mexico was a second center of diversity of the genus Pinus, this country having the largest number of records of species of this genus. Both Martinez (1948) and Mirov (1967) recognized 38 species and 25 varieties or forms of pines in Mexico, but the number is now higher – over 45 species are recognized at present (Farjon & Styles, 1997; Perry et al., 1998). The genus Pinus has two well-defined subgenera: on the one hand, trees with leaves having a single vascular bundle and several external resin canals, as well as fascicles with a usually deciduous sheath. These form the subgenus Strobus, some 15 species of which occur in Mexico, classified in two sections and three subsections (Farjon & Styles, 1997). On the other hand is the subgenus Pinus that is characterized by leaves with two vascular bundles and fascicles with a usually persistent sheath while still attached to the tree; in some cases the sheath persists even after the fall of the fascicle (Farjon & Styles, 1997). In Mexico, 34 species of this subgenus are recognized which are classified in two sections and six subsections according to Farjon & Styles (1997)." @default.
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- W1574609773 date "2011-12-22" @default.
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- W1574609773 title "Phylogenetic Analysis of Mexican Pine Species Based on Three Loci from Different Genomes (Nuclear, Mitochondrial and Chloroplast)" @default.
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- W1574609773 doi "https://doi.org/10.5772/26988" @default.
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