中文名（Chinese Name）：四川苏铁
学名（Scientific Name）：Cycas szechuanensis Cheng et L. K. Fu
英文名（English Common Name）：
别名（Chinese Common Name）：南盘江苏铁
异名（Synonym）：Cycas szechuanensis subsp. fairylakea (D.Yue Wang) N.Liu 
科属（Family & Genus）：苏铁科（Cycadaceae）苏铁属
形态特征（Description）：树干圆柱形，直或弯曲，高2-5米。羽状叶长1-3米，集生于树干顶部；羽状裂片条形或披针状条形，微弯曲，厚革质，长18-34厘米，宽1.2-1.4厘米，边缘微卷曲，上部渐窄，先端渐尖，基部不等宽,两侧不对称，上侧较窄，几靠中脉，下侧较宽、下延生长,两面中脉隆起，上面深绿色，有光泽，下面绿色。大孢子叶扁平，有黄褐色或褐红色绒毛，后渐脱落，上部的顶片倒卵形或长卵形，长9-11厘米，宽4.5-9厘米，先端圆形，边缘篦齿状分裂，裂片钻形，长2-6厘米，粗约3毫米，先端具刺状长尖头，无毛，下部柄状，长10-12厘米，密被绒毛，下部的绒毛后渐脱落，在其中上部每边着生2-5（多为3-4)枚胚珠，上部的1-3枚胚珠的外侧常有钻形裂片生出，胚珠无毛。
分布（Distribution）：四川西部峨眉山、乐山、雅安及福建南平等地有栽培。
用途（Use）：庭园观赏树种。
引自中国植物志英文版FOC Vol. 4
Cycas szechuanensis W. C. Cheng & L. K. Fu in W. C. Cheng et al., Acta Phytotax. Sin. 13(4): 81. 1975.
四川苏铁 nan pan jiang su tie | Cycadaceae  | Cycas
Cycas guizhouensis K. M. Lan & R. F. Zou; C. multiovula D. Y. Wang.
Trunk to 2.9(-5) m × 40(-50) cm; bark dark gray, scaly. Leaves 60-90, 1-pinnate, 1-2.5(-3) m × 35-50 cm; petiole subrhombic in cross section, 40-70 cm, with 25-50 spines along each side; leaf blade oblong, flat, pale brown villous when young; leaflets in 60-120 pairs, longitudinally inserted at ca. 50° to rachis, straight or slightly falcate, 15-35 × 0-1.3 cm, thick, leathery, glabrous, midvein strongly raised on both surfaces, base decurrent, margin flat or slightly recurved, apex acuminate. Cataphylls triangular, 4-5 × 1.5-2.2 cm, brown tomentose, apex with long, soft point. Pollen cones fusiform-cylindric, ca. 25 × 6 cm; microsporophylls cuneate, 2-3 × 0.8-1.2 cm. Megasporophylls more than 30, tightly grouped, 14-23 cm, densely yellowish brown tomentose; stalk 5-14 cm; sterile blade broadly ovate, obovate, or suborbicular, 6-11 × 5-9 cm, margin glabrescent and pectinate, with 17-27 subulate lobes 2-6 cm, terminal lobe subulate to flattened, a little longer than lateral lobes; ovules (2 or)3 or 4(or 5) on each side of stalk, orange, glabrous. Seeds pale yellow when fresh, pale brown when dry, subglobose or obovoid, slightly compressed, 2.5-3 × 2.3-2.8 cm, apex mucronate; sclerotesta smooth. Pollination Apr-Jun, seed maturity Oct-Nov.
Thickets and sparse forests along hot and dry valleys of the Nanpan Jiang; 400-1300 m. NW Guangxi, SW Guizhou, E Yunnan; cultivated in Guizhou, Sichuan, and Yunnan [Vietnam]
Described from sterile plants introduced to Sichuan from the Napan Jiang valley. As defined here, Cycas szechuanensis is a very wide ranging species, close to C. hainanensis, but differs in its smaller seeds. Recently, several wild populations and material in cultivation have been segregated as distinct species. However, more studies are necessary before it can be determined whether or not these entities appropriately represent the range of variability found within and between populations, and whether or not variation within vegetatively propagated material in cultivation merely represents extreme forms selected for their ornamental value.
（责任编辑：徐晔春）