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FOC | Family List | FOC Vol. 2-3 | Pteridaceae | Pteris

29. Pteris ensiformis N. L. Burman, Fl. Indica. 230. 1768.

剑叶凤尾蕨 jian ye feng wei jue

Plants 30-50 cm tall. Rhizome ascending or prostrate, slender, 4-5 mm in diam., apex with black-brown scales. Fronds dense, dimorphic; sterile fronds 1.5-2(-3) cm apart, shorter than fertile fronds; stipe and rachis straw-colored, slightly lustrous, stipe 10-30 cm (stipes of sterile fronds shorter), 1.5-2 mm in diam., glabrescent; lamina oblong-ovate, 10-25 × 5-15 cm, pinnate to bipinnate; pinnae 2-6 pairs, opposite, slightly decumbent, upper ones sessile, lower pairs shortly stalked; sterile fronds often pinnate, triangular in outline, 2.5-3.5(-8) × 1.5-2.5(-8) cm, acuminate; pinnules (1 or)2 or 3 pairs, opposite, contiguous, sessile, decumbent, oblong-oblanceolate to broadly lanceolate, basally decurrent and entire, upward and apices with acute teeth, apex obtuse; pinnae of fertile fronds distant (basal pairs 5-7 cm apart), 1-3-forked, middle fork longest, apical pinnae not decurrent at base, basal two pairs sometimes pinnate; pinnules 2 or 3(or 4) pairs, decumbent, narrowly linear, basally decurrent, margins entire except at apices, sterile parts with dense teeth, apically acuminate; midvein straw-colored, adaxially prominent; veins dense, often forked; lamina gray-green to brown-green, sometimes with nearly white bands along each side of midvein, herbaceous when dried, glabrous. n = 58.

Wet acidic soils beneath forests, streamsides; 100-1000 m. Chongqing, Fujian, Guangdong, Guangxi, SW Guizhou, Hainan, S Jiangxi, Sichuan, Taiwan, S Yunnan, S Zhejiang [Bhutan, Cambodia, N India, Japan (Ryukyu Islands), Laos, Malaysia, Myanmar, Nepal, Sri Lanka, Thailand, Vietnam; Australia, Pacific islands (Fiji, Polynesia)].

1 Pinnae with a ?white band along each side of midvein.   29b var. victoriae
+ Pinna midveins lacking off-white bands   (2)
2 (1) Basal pinnae each with 2 or 3 pinnules, second and third (to fifth) pairs with 2 pinnules; middle sterile lateral pinnae narrowly lanceolate, 4-6 ?ca. 1 cm; fronds often 1-pinnate, or ?bipinnate at base.   29c var. merrillii
+ Basal pinna pair or lateral pinnae often with 2-4 pinnules, lowest pair (or basal pairs) often 3- or 4-forked or subpinnate   (3)
3 (2) Fertile pinnae apically not forked, (or 2- or 3-forked); fronds bipinnate, pinnae 3-6 pairs, 2.5-3.5(-8) cm.   29a var. ensiformis
+ Fertile pinnae apically 1- or 2-forked, pinnae 2-3 cm, spreading.   29d var. furcans

Lower Taxa


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