中文名（Chinese Name）：篦齿苏铁
学名（Scientific Name）：Cycas pectinata Buch.-Ham.
英文名（English Common Name）：
别名（Chinese Common Name）：
异名（Synonym）：Cycas jenkinsiana Griff.  Cycas dilatata Griff.  Cycas wallichii Miq.
科属（Family & Genus）：苏铁科（Cycadaceae）苏铁属
形态特征（Description）：树干圆柱形，高达3米。羽状叶长1.2-1.5米，叶轴横切面圆形或三角状圆形,柄长15-30厘米，两侧有疏刺，刺略向下弯，长约2毫米，羽状裂片80-120对，条形或披针状条形，厚革质，坚硬，直或微弯，边缘稍反曲，上部微渐窄，先端渐尖，基部窄，两侧不对称，下延生长，上面深绿色，中脉隆起，脉的中央常有一条凹槽，下面绿色，有散生短柔毛或渐变无毛，中脉显著隆起，中部的羽状裂片长15-20厘米，宽6-8毫米。雄球花长圆锥状圆柱形，长约40厘米，径10-15厘米，有短梗，小孢子叶楔形，长3.5-4.5厘米，顶部三角状或斜方形，先端具钻形长尖头，宽1.2-2厘米，密生褐黄色绒毛，花药3-5 (多为4)个聚生; 大孢子叶密被褐黄色绒毛，上部的顶片斜方状宽圆形或宽圆形，宽较长为大或长宽几相等，宽6-8厘米，边缘有30余枚钻形裂片，裂片长3-3.5厘米，先端尖，通常无毛，顶生的裂片较长大，长4-5厘米，边缘常疏生锯齿或再分裂，大孢子叶的下部急缩成粗短的柄状，长3-7厘米，上部两侧生胚珠2-4枚，胚珠无毛，卵圆形或近圆球形，顶端有一乳头状突起点。种子卵圆形或椭圆状倒卵圆形，长4.5-5厘米，径4-4.7厘米，熟时暗红褐色，具光泽，干后外种, 皮常同中种皮分离开。
分布（Distribution）：产于云南西南部，昆明有栽培，作庭园观赏树用。印度、尼泊尔、锡金、缅甸、泰国、柬埔寨、老挝、越南也有分布。
用途（Use）：
引自中国植物志英文版FOC Vol. 4
Cycas pectinata Buchanan-Hamilton, Mem. Wern. Nat. Hist. Soc. 5: 322. 1826.
篦齿苏铁 bi chi su tie | Cycadaceae  | Cycas
Cycas circinalis Linnaeus var. pectinata (Griffith) Schuster; C. dilatata Griffith; C. jenkinsiana Griffith; C. pectinata Griffith; C. wallichii Miquel.
Trunk cylindric, often dichotomously branched toward apex and gradually thickened toward base, up to 16 m × 60 (-90) cm, apex not tomentose; bark gray or white-gray, smooth toward base of trunk. Leaves 40-80(-100), 1-pinnate, 0.7-1.2 (-1.5) m × 20-30(-40) cm; petiole compressed orbicular in cross section, 10-35 cm, with 6-15 spines along each side above middle part; leaf blade oblong-lanceolate, flat or occasionally slightly "V"-shaped in cross section, pale brown tomentose when young; leaflets in 50-100 pairs, longitudinally inserted at 50-60° to rachis, straight to falcate, 9-20 cm × 5-7 mm, thickly, leathery, midvein flat adaxially, sulcate when dry, raised abaxially, base decurrent, margin slightly recurved, apex acute, pungent. Cataphylls triangular, 3.5-4.5 × 1.5-2 cm, brown tomentose, apex soft. Pollen cones fusiform, 30-45 × 10-15 cm; microsporophylls cuneate, 3.5-5 × 1.2-2.5 cm, densely pale brown tomentose, apex thickened, with an upcurved point 3-4 cm. Megasporophylls more than 30, tightly grouped, 13-18 cm, densely yellowish brown silky hairy; stalk 4-7 cm; sterile blade deltoid-ovate or suborbicular, 7-9 × 6-10 cm, margin pectinate, with 29-37 lobes 2.5-3.5 cm, terminal lobe subulate, 3-4.5 cm; ovules 1(-3) on each side of distal part of stalk, glabrous. Seeds 2(-4), orange, becoming dark brown, often obovoid, compressed, 4.5-6 × 4-4.7 cm; sclerotesta smooth, sarcotesta with a mixed, thick, fleshy, fibrous layer. Pollination Jun-Jul, seed maturity Feb-Mar.
Dry, open thickets in limestone mountains, red soil in sparse monsoon forests; 1000-1800 m. S Yunnan [Bangladesh, Bhutan, Cambodia, NE India, Laos, Myanmar, Nepal, Sikkim, Thailand, Vietnam]
A vulnerable species in China. Cultivated as an ornamental in S Yunnan and elsewhere in SE Asia. Chinese plants have been misidentified as C. rumphii Miquel (e.g., in FRPS), which occurs only in Indonesia and Papua New Guinea.
（责任编辑：徐晔春）