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The female cones are from 11–17 cm (4.3–6.7 in) long, [4] larger and with thicker scales than those of other douglas-firs, and with exserted tridentine bracts. The seeds are large and heavy, 10 mm long and 8 mm broad, with a short rounded wing 13 mm long; [ 4 ] they may be bird or mammal dispersed as the wing is too small to be effective ...
The cones are sexually dimorphic: the male cone is a 40 to 50 cm long cylinder that is 7 to 10 cm wide with a peduncle that is up to 2 to 3 cm long; the female cone is 25 to 50 cm long, 20 to 25 cm wide, and sessile. Males can have up to ten cones at one time and females can have up to five cones at one time. [3]
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The stems and leaves regenerate after the cold period subsides with full foliage. [8] [9] Like other cycads, Z. integrifolia is dioecious, having male or female plants. The male cones are cylindrical, growing to 5–16 cm long; they are often clustered. The female cones are elongate-ovoid and grow to 5–19 cm long and 4–6 cm in diameter. [8]
The woody cone is the female cone, which produces seeds. The male cone, which produces pollen, is usually ephemeral and much less conspicuous even at full maturity. The name "cone" derives from Greek konos (pine cone), which also gave name to the geometric cone. The individual plates of a cone are known as scales.
The cones are small and inconspicuous at pollination in late winter, the pollen cones in clusters of 10–30 together, the female cones singly or 2–3 together. [6] The seed cones mature in 7–8 months to 2.5–4.5cm long, ovoid to globose, with spirally arranged scales; each scale bears 3–5 seeds.
The catkin like male cones are 2–5 millimetres (0.079–0.197 in) long, and shed pollen in the early spring. They are sometimes externally only slightly differentiated from the branches. The fertile bracts have 2-8 pollen sacs. [1] [2] The female 'cones' are highly reduced. [1]
The pollen grains are streamlined and have only one germ line (monosulcate). The male cones fall off after one year. The female cones are also stalked and can remain on the plant for more than a year. The female microsporophyll are more leaf-like than those of other cycads, the greatest similarity to those of the genus Cycas. The scales are ...