《云南植物志》|| 蕨科 Pteridiaceae ||蕨属 Pteridium Scopoli ||蕨 Pteridium aquilinum (L.) Kuhn var. latiusculum (Desv.) Underw. ex Heller

1. 蕨 （中国植物志）
Pteridium aquilinum (L.) Kuhn var. latiusculum (Desv.) Underw. ex Heller (1909); 中国植物志 (1959)*; 图鉴 (1972)*; 四川植物志 (1988)*.
Pteris latiuscula Desv. (1827).
植株高约80—100厘米。根状茎长而横走，密被锈色柔毛；叶远生。 叶柄长40—60厘米，基部直径约4—5毫米，暗棕色，有锈色毛，向上禾秆色，近光滑。叶片三角状卵形，长约40—60厘米，宽约40—50厘米，三回羽状。侧生羽片6—9对，基部1对最大，长约25—30厘米，宽约10—15厘米，基部有长达8厘米的柄，上部羽片逐渐缩小而变为一回羽状。基部羽片的小羽片约10—13对。末回小羽片约10—15对，近基部羽状半裂或羽状浅裂，向上变全缘，顶端短渐尖或钝。叶脉分离，侧脉二叉或单一，表面不明显，背面隆起而明显。叶轴、羽轴禾秆色，下面疏被短柔毛。叶片近革质，上面光滑无毛，下面疏被柔毛或近无毛。孢子囊群线形，生于末回小羽片边缘，囊群盖两层，连续。
产于全省各地；生于林缘空地上或荒坡上，海拔500—2200米。也分布于全国各地和全世界各地。
根状茎可提取淀粉供食用，嫩叶可食用，全株入药，具利尿、解毒作用。

《Flora of North America》|| Dennstaedtiaceae || Pteridium || Pteridium aquilinum

1c. Pteridium aquilinum var. latiusculum (Desvaux) L. Underwood ex A. Heller, Cat. N. Amer. Pl. ed. 3. 17. 1909.

Eastern bracken

Pteris latiuscula Desvaux, Mém. Soc. Linn. Paris 6. 2: 303. 1827; Pteridium latiusculum (Desvaux) Hieronymus ex Fries

Petiole 15--100 cm. Blade broadly triangular to sometimes ovate, 3-pinnate or 3-pinnate-pinnatifid at base, 20--80 × 25--50 cm; blade margins and abaxial surface shaggy, rachises and costae glabrous or sparsely pilose abaxially. Pinnae (proximal) broadly triangular, distal pinnae narrowly triangular or oblong; terminal segment of each pinna ca. 2--4 times longer than wide, longer ultimate segments less than their width apart, ca. 3--6 mm wide. Pinnules at 45°--60° angle to costa; fertile ultimate segments adnate or equally decurrent and surcurrent. Outer indusia entire or somewhat erose, glabrous. 2 n = 104.

In barrens, pastures, open woodlands in moderately to strong acid soil, abundant, forming large colonies; 0--1500 m; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld., N.S., P.E.I., Ont., Que.; Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Pa., R.I., S.C., S.Dak., Tenn., Vt., Va., W.Va., Wis.; Mexico in Nuevo León; Europe; Asia.

Colonies are more frequent in the northern part of the range. Fertile colonies, however, are more frequent in the southern and eastern portion of the range. Outliers in British Columbia and Alberta, which we have not seen, are documented in W. J. Cody and D. M. Britton (1989).

《Flora of China》|| Dennstaedtiaceae || Pteridium || Pteridium

1. Pteridium aquilinum (Linnaeus) Kuhn var. latiusculum (Desvaux) Underwood ex A. Heller, Cat. N. Amer. Pl., ed. 3. 17. 1909.

蕨 jue

Pteris latiuscula Desvaux, Mém. Soc. Linn. Paris 6(3): 303. 1827; Pteridium aquilinum f. glabrum Tardieu & C. Christensen; P. aquilinum subsp. japonicum (Nakai) Á. Löve & D. Löve; P. aquilinum var. japonicum Nakai; P. aquilinum subsp. latiusculum (Desvaux) Hultén; P. japonicum Tardieu & C. Christensen; P. latiusculum (Desvaux) Hieronymus ex Fries; Pteris lanuginosa Sprengel (1821), not Bory ex Willdenow (1810).

Plants up to 2 m tall. Rhizome long creeping, densely castaneous hairy. Fronds erect, 0.5-1.5 m (sometimes larger in shaded forms); stipe brown, up to 40 cm, woody, basally with short brown hairs, apically glabrous; lamina 3- or 4-pinnate-pinnatifid, triangular to oblong-ovate in outline when pressed, leathery; basal pinnae as long as to ca. 1/2 length of lamina; rachis pale brown, thinly pubescent, becoming glabrous; lobes present between 2 adjacent segments; pinnae ascending or horizontal, ovate-triangular to oblong, up to 40 × 15 cm, apex acute; pinnules or segments linear to oblong, glabrous except for pinnule margins and midvein, deeply pinnatifid in larger pinnae, apex shortly bluntly or long caudate. Sori elongate, submarginal on ultimate segments; outer indusium ca. 0.5 mm wide, membranous, ciliate, inner indusium vestigial and fimbriate. 2n = 104.

Sunny slopes and forest margins; 100-800 m. Throughout China, but mostly in S China including Taiwan [Japan (including Ryukyu Islands); Europe, North America].

The typical variety is distributed in Africa and Europe.