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The cones remain closed for many years, only opening after the parent tree is killed in a wildfire, thereby allowing the seeds to colonize the bare ground exposed by the fire. The male cones are 3–5 mm (0.12–0.20 in) long, and release pollen in February/March. Typically cones of H. goveniana are smaller than those of H. macrocarpa.
Trees were reported growing as low as 3,000 feet (910 m) in elevation in 1998, but the presence of these individuals today has not been verified. [5] Most individual trees occur at 4,500–5,100 feet (1,400–1,600 m) within the Pacific Southwest Research Station's King Creek Research Natural Area, in the Cleveland National Forest .
Cones form on slender fruiting branchlets that are solitary and separated from one another. [3] Both the male and female cones form on the same tree, with the male cones appearing on the end of branchlets at a size of 2–3 mm long, while the female cone forms on a branchlet that has a waxy, greyish-blue coloring during its development. [ 4 ]
Callitris is a genus of coniferous trees in the Cupressaceae (cypress family). There are 16 recognized species in the genus, of which 13 are native to Australia and the other three (C. neocaledonica, C. sulcata and C. pancheri) native to New Caledonia. [1]
The pollen cones are 3–5 mm long, and release their pollen in late winter or early spring. [8] [9] [10] The Latin specific epithet macrocarpa means "with large fruit". [11] Because of the large trunk size some trees develop, people have assumed that individual H. macrocarpa trees may be up to 2,000 years old.
Hesperocyparis arizonica was given its first scientific name and described by Edward Lee Greene in 1882 as Cupressus arizonica, placing it in genus Cupressus. [3] [5] This description was soon after disputed by Maxwell T. Masters who, in 1896, published a journal article where he said it should be considered a subspecies of Cupressus benthamii with the variety name of arizonica. [3]
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The seed cones are globose to oblong, covered in warty resin glands, 10–25 mm (3 ⁄ 8 –1 in) long, with 6 or 8 (rarely 4 or 10) scales, green to brown at first, maturing gray or gray-brown about 20–24 months after pollination. The male cones are 3–5 mm long, and release pollen in February–March.