SFR 107 Lecture Notes - Lecture 6: Paclitaxel, Larix Laricina, Juniperus Horizontalis
11 Dec 2016
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Includes conifers (softwoods: pines, spruces, firs, hemlocks , cedars, junipers, sequoias, redwoods, cypresses, yews. Dominant group in cool/cold temperate forests of northern hemisphere. Includes some of the most valuable commercial species. Conduction of water and support for stem. Architecture: tapered ends and thick walls, connected by bordered pits to other tracheid. Woody" xylem resulted from the selective pressure for sturdy stems. Pinaceae-pine family: pinus-pine, picea-spruce, abies-true fir, tsuga-hemlock, pseudotsuga-douglas-fir, larix-larch. Cupressaceae-cypress family: sequoia-redwood, taxodium-bald cypress, thuja-cedar, juniperus-red cedar. About 125 spp: most in northern hemisphere. Valuable commercial species: lumber, fiber, veneer/plywood. Foliage: 5-needles per fascicle, finely serrate, 2-year retention, deciduous sheath at base. Cones: 5 to 10 cm long, scales with rounded apices and slight recurve at tips, long-stalked, medium yellow-brown. Bark: deeply furrowed in older trees, smooth gray-green in young trees. Ecology: often above other trees in canopy (emergent, moderately shade-tolerant, especially when young, well-drained, sandy soils, deep rooted, long-lived.
