Search results
Results from the WOW.Com Content Network
Apart from two species in the yew family, all are in either the pine family (including firs, larches, spruces, pines, Douglas firs and hemlocks) or the cypress family (including junipers, redwoods, giant sequoias, bald cypresses and four genera of cedars). [2] [6] [7] [b] Softwood from North American conifers has a variety of commercial uses.
The members of the pine family (pines, spruces, firs, cedars, larches, etc.) have cones that are imbricate (that is, with scales overlapping each other like fish scales).). These cones, especially the woody female cones, are considered the "archetypal" tree cones.The female cone has two types of scale: the bract scales, and the seed scales (or ovuliferous scales), one subtended by each bract ...
The two-volume, extensively illustrated encyclopedia is a complete reference book covering all recognised conifer cultivars and species, both hardy and tropical. The 1,500-page work features names, synonyms, and brief descriptions, as well as information about height and spread after 10 years, where known, for over 8,000 cultivars and all 615 ...
Conifers are the largest and economically most important component group of gymnosperms, but nevertheless they comprise only one of the four groups. The division Pinophyta consists of just one class, Pinopsida, which includes both living and fossil taxa. Subdivision of the living conifers into two or more orders has been proposed from time to time.
Pinidae (Pinophyta, [18] [28] conifers 70, 600) The term Pinophyta has also been used to include all conifers, extinct and extant, with Pinales representing all the extant conifers. [29] Christenhusz and colleagues extended the system of Chase and Reveal [19] to provide a revised classification of gymnosperms in 2011, based on the above four ...
One well researched resin present in Pinaceae is oleoresin. Oleoresin had been found to be a valuable part of the conifer defense mechanism against biotic attacks. [32] They are found in secretory tissues in tree stems, roots, and leaves. [32] Oleoresin is also needed in order to classify conifers. [32]
The conifers, division Pinophyta, are one of 13 or 14 division level taxa within the Kingdom Plantae. They are cone -bearing seed plants with vascular tissue; all extant conifers are woody plants , the great majority being trees with just a few being shrubs .
Podocarpus (/ ˌ p oʊ d ə ˈ k ɑːr p ə s / [2]) is a genus of conifers, the most numerous and widely distributed of the podocarp family, the Podocarpaceae. Podocarpus species are evergreen shrubs or trees, usually from 1 to 25 m (3 to 82 ft) tall, known to reach 40 m (130 ft) at times.