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Dinghushan | Family List | Cycadaceae | Cycas

Cycas revoluta Thunb.

苏铁

Description from Flora of China

Trunk to 3(-8) m × 45(-95) cm, base and sometimes distal part with numerous adventitious lateral branches or bulbils, apex tomentose; bark gray-black, scaly. Leaves 40-100 or more, 1-pinnate, 0.7-1.4(-1.8) m × 20-25(-28) cm; petiole subtetragonal in cross section, 10-20 cm, with 6-18 spines along each side; leaf blade oblong- or elliptic-lanceolate, strongly "V"-shaped in cross section, recurved, brown tomentose when young; leaflets in 60-150 pairs, horizontally inserted at ca. 45° above rachis, not glaucous when mature, straight to subfalcate, 10-20 cm × 4-7 mm, leathery, sparsely pubescent abaxially, base decurrent, margin strongly recurved, apex acuminate, pungent. Cataphylls triangular, 4-5 × 1.5-2.3 cm, densely brown tomentose, apex acuminate. Pollen cones pale yellow, ovoid-cylindric, 30-60 × 8-15 cm; microsporophylls narrowly cuneate, 3.5-6 × 1.7-2.5 cm, apex rounded-truncate, cuspidate. Megasporophylls yellow to pale brown, 14-22 cm, densely tomentose; stalk 7-12 cm; sterile blade ovate to narrowly so, 6-11 × 4-7 cm, deeply laciniate, with 21-35 lobes 1-3 cm; ovules 2 or 3 on each side of stalk, densely pale brown tomentose. Seeds 2(-5), orange to red, obovoid or ellipsoid, somewhat compressed, (3-)4-5 × 2.5-3.5 cm, sparsely hairy; sclerotesta not grooved on sides. Pollination May-Jul, seed maturity Sep-Oct.

A vulnerable, if not endangered, species in China. Its formerly wide distribution in E Fujian has now been severely reduced as a result of over collection by commercial dealers and habitat destruction. It was sporadically distributed in Fujian in the 1960s, but it is now uncertain that any wild populations still exist. Cycas revoluta is the most commonly cultivated cycad because of its ornamental appearance, hardiness, and adaptability.

Thickets on hillsides on islands, sparse forests on mainland; 100-500 m. Fujian (Lianjiang Xian, Ningde Xian, and some islands) [S Japan (Kyushu, Ryukyu Islands)]

生活型: 灌木

栽培植物: 栽培

特征: 棕榈状常绿树;果朱红色

果期: 9

生境: 栽培

用途: 庭园绿化观赏树种;茎内含淀粉,可制西米(沙谷米)供食用;药用,种子和花(大孢子叶)化气止痛、调经,治咳嗽、吐血、胃气痛、肠炎、跌打损伤、腰酸痛、痛经、遗精,叶治痢疾、小儿消化不良和各种出血,根治腰骨疼痛、肾虚牙痛、风湿麻木

门中名: 种子植物门

亚门中名: 裸子植物亚门

中文别名: 铁树


 

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