中文名（Chinese Name）：海南苏铁
学名（Scientific Name）：Cycas hainanensis C. J. Chen
英文名（English Common Name）：
别名（Chinese Common Name）：刺柄苏铁
异名（Synonym）：Cycas ramiflora G. A. Fu
科属（Family & Genus）：苏铁科（Cycadaceae）苏铁属
形态特征（Description）：羽状叶长约1米，叶柄长约20厘米、横切面四方状圆形，两侧密生刺，刺间距离约1厘米，刺长3-4毫米；羽状裂片近对生，条形，革质，斜上伸展，中部的羽状裂片与叶轴约成60度的角度，通常直或微弯，长约15厘米，宽约6毫米，先端渐尖，基部收缩不对称，下侧下延生长，边缘微向下反卷，上面深绿色，有光泽，下面淡绿色，两面光滑，上面的中脉显著隆起，下面的中脉微隆起。大孢子叶幼时被褐色绒毛，后渐脱落几无毛，上部的顶片斜方状卵形，长约7厘米，宽约5厘米，边缘羽状分裂，每边有裂片5-7条，裂片条状钻形，长2-3厘米，粗约2.5毫米，先端有刺状尖头，顶生裂片矩圆形，扁平，上部变坚硬，长3.5-4厘米，宽1.5-2厘米，边缘在中下部全缘，在上部具数枚锯齿或再分裂，先端有一长刺，长1-1.4厘米，边缘有少数不明显的疏锯齿；大孢子叶的下部柄状，长约7厘米，横切面四方状圆形，在其中部两侧着生2枚胚珠；胚珠卵圆形，无毛。种子幼时压千后呈红褐色，宽倒卵圆形，稍扁，表面有不规则的皱纹。
分布（Distribution）：产于广东海南岛万宁（模式标本产地）及海口等地。
用途（Use）：园林观赏植物
引自中国植物志英文版FOC Vol. 4
Cycas hainanensis C. J. Chen in W. C. Cheng et al., Acta Phytotax. Sin. 13(4): 82. 1975.
海南苏铁 hai nan su tie | Cycadaceae  | Cycas
Trunk to 1.5(-2.5) m × ca. 40 cm, inflated toward base; bark dark gray and scaly toward apex of trunk, white-gray and nearly smooth toward base. Leaves 50-80, 1-pinnate, 1-2.2 m × 30-50 cm; petiole rhombic in cross section, 20-70 cm, with 50-80 spines along each side from base upward; leaf blade elliptic-oblong, flat; leaflets in 50-80 pairs, longitudinally inserted 0.8-1.5 cm apart at 40-50° to rachis, straight, 15-30 cm × 6-9(-11) mm, leathery, glabrous abaxially, base decurrent, margin flat or slightly recurved, apex acuminate, pungent. Cataphylls triangular, 5-5.5 × 2-2.3 cm, densely brown tomentose, apex abruptly tapered into a long point, soft and recurved when fresh, becoming hard and straight when dry. Pollen cones unknown. Megasporophylls more than 30, tightly grouped, 14-20 cm, brown tomentose; stalk 7-12 cm; sterile blade greenish, ovate or broadly so, 6.5-9 × 6-9(-12) cm, glabrescent, margin pectinate, with 13-27 lobes 1-3 cm, terminal lobe flattened, oblong or triangular, 2-3(-4) × 0.7-2(-3) cm, remotely serrulate; ovules 1 or 2 on each side of distal part of stalk, glabrous. Seeds greenish to yellowish, broadly ovoid or subglobose, slightly compressed, 3.5-4.5 × 2.8-3.6 cm; sclerotesta finely verrucose. Pollination Mar-May, seed maturity Sep-Oct.
Tropical jungles and thickets with sparse trees; 100-1000 m. Hainan
（责任编辑：徐晔春）