Fir morphological characteristics


Fir is a genus of Pinaceae, an evergreen tree with straight trunks and branches. The small pupils have opposites, the base has persistent bud scales, and the leaves have near-circular leaf marks on the branches; winter buds often have resin The top buds are arranged in a plane. Leaves, bud scales, stamens, scales, bead scales and seed scales are arranged in a spiral. Leaf radiation extension or base torsion arranged in two rows overlapping each other, or leaves below the twigs in two rows, the upper leaves obliquely extending, straight or backward recurved, leaf linear, flat, sparsely upper and lower, apex pointed, blunt , concave or double-lobed, petiole very short, apical micro-expansion in the shape of a suction cup; leaves with 2 (thin 4 to 12) resin channels, located on both sides of the vascular sheath sheath (middle), or near the lower ends Subcutaneous cells (edge). Hermaphroditic, spheroidal singularly born in last year's stalks of stalks, male stalks sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately Scales, the base of the ventral surface of the bead scale has 2 inverted ovules. The cones are mature, erect, elliptical or short-cylindrical, often black, purple-black or blue-black at high altitudes. They are born in low-altitude and low-latitude regions and are green at first. Yellowish brown, brown or reddish brown; the scales are woody, closely arranged, often fan-shaped quadrilateral or kidney-shaped; the scales are shorter than the species, or longer than the scales; the seeds have broad membranous wings, and the seed coats have The resin capsule has a slightly shorter wing than the seed scale, and the lower end edge wraps the seed. After the cones are ripe and dry, the scales and seeds are detached from the central axis of the deposit.

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