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The male cones are 3–5 mm long and release highly allergenic pollen in late winter. The cones of C. sempervirens can withstand years of being sealed and are known to perform serotiny. [8] The tree is moderately susceptible to cypress canker, caused by the fungus Seiridium cardinale, and can suffer extensive dieback where
Swamp cypress is a shrub or small tree, reaching eight metres tall. The leaves are evergreen and scale-like, except on young seedlings, where they are needle-like. The leaves are arranged in six rows along the twigs, in alternating whorls of three. The male cones are small, 3–6 mm long, and are located at the tips of the twigs. The female ...
Cypress are evergreen trees or large shrubs, growing to 5–40 m (16–131 ft) tall, exceptionally up to 102 m tall (the second-tallest tree species on earth, after Sequoia sempervirens) in Cupressus austrotibetica. [5]
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.
The leaves are scale-like, 1–2 mm long, up to 5 mm long on strong lead shoots; young trees up to about 5–10 years old have juvenile foliage with soft needle-like leaves 3–8 mm long. The seed cones are globose, 8–15 mm long, with 6–10 scales (usually 8), green, maturing dark brown about 24 months after pollination. The cones open at ...
The tree bark is dark red or brown and has deep grooves. The seeds are found in cones about 2 cm in length, with eight scales and five seeds with tiny resinous vesicles. With the tree being a hybrid, its seeds are sterile. Over time, the cones shrink dry and turn gray or chocolate brown and then have a diameter of 1 cm. [12]
The tree's female cones are about 10 mm in diameter, while cone scales are normally 6–8 mm. Often, but not always, they have conspicuous umbos 3–4 mm, which are high and conical. There are normally 100-125 seeds per cone, not at all glaucous. 3-4 cotyledons are usually present.
Inside the cone are approximately 70 to 100 seeds, brown with a light waxy coating described by botanists as glaucous. [3] [10] The seeds are much larger than those of other western cypress trees, weighing two to seven times as much. [4] Closed, but already ripe, cones still on the trees will also open after being exposed to the heat of a fire ...