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Pinaceae: needle-like leaves and vegetative buds of Coast Douglas fir (Pseudotsuga menziesii var. menziesii) Araucariaceae: awl-like leaves of Cook pine (Araucaria columnaris) In Abies grandis (grand fir), and many other species with spirally arranged leaves, leaf bases are twisted to flatten their arrangement and maximize light capture.
The leaf arrangements are organized in an opposite pattern, with two leaves per node. The leaves are termed scale leaves because they are thick. This plant is known as conifer because the reproductive portions of this species are organized in yellow-green cones.
The male cone (microstrobilus or pollen cone) is structurally similar across all conifers, differing only in small ways (mostly in scale arrangement) from species to species. Extending out from a central axis are microsporophylls (modified leaves). Under each microsporophyll is one or several microsporangia (pollen sacs).
The Pinaceae (/ p ɪ ˈ n eɪ s iː ˌ iː,-s i ˌ aɪ /), or pine family, are conifer trees or shrubs, including many of the well-known conifers of commercial importance such as cedars, firs, hemlocks, piñons, larches, pines and spruces. The family is included in the order Pinales, formerly known as Coniferales.
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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.
The leaves are generally flat with a decurrent base and a spreading blade, but leading and cone-bearing shoots may also have small appressed scale-like leaves. [ 1 ] [ 6 ] [ 7 ] The base phyllotaxis or leaf arrangement is spiral though the leaves usually form subopposite and nearly decussate pairs.
The leaves are needle-like, flattened, 2.5–8 cm (1– 3 + 1 ⁄ 8 in) long and 2 millimetres (3 ⁄ 32 in) wide by 0.5–1 mm (1 ⁄ 64 – 3 ⁄ 64 in) thick, green to glaucous blue-green above, [8] and with two glaucous blue-white bands of stomatal bloom below, and slightly notched to bluntly pointed at the tip. The leaf arrangement is ...
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