别名：披散问荆;散生问荆;散生部荆;密枝木贼;接续草;笔筒草;捍子洞俄然;笔头菜;担子洞俄然;哈岔查让;密枝问荆;小笔管草;问荆;细塔筒;节节草;捏子洞俄然;散生木贼;

科名：木贼科 Equisetaceae

属名：木贼属 Equisetum

《中国植物志》第6(3)卷226页
  1.披散木贼（四川植物志）散生木贼（中国高等植物图鉴）图版69: 1-2
  Equisetum diffusum D. Don in Prodr. Fl. Nepal. 19. 1825: C. B. Clarke in Trans. Linn. Soc. II. Bot. 1: 594. 1880; Baker, Handb. Fern Allies 3. 1887; C. Chr. in Meddel. Fran Geoteb. Bot. Tr. 44: 108. 1924; Schaffner et L. C. Li in Bull. Fan Mem. Inst. Biol. Bot. 9: 125. 1939; Rothm. in Fedde, Repert. Sp. Nov. 54: 75. 1944; Tard. -Blotet C. Chr. in Fl. Indo-Chine 7 (2): 544, f. 64: 8-10. 1951: S. H. Fu, Ill. ImportantChinese Pl., Pterid. 14. 1957; Mehra et Bir in Res. Bull. Panjab Univ. 15 (1-2): 100. 1964; Tagawa in Hara, F. E. Himal. 2: 197. 1971: Ic. Corm. Sin. 1: 116. 1972; Fl. Tsinling. 2: 24. 1974; C. N. Page in Fern Gaz. 11 (1): 29, f. 7. 1974: K. Iwats. inOhashi, Fl. E. Himal. 3: 166. 1975; Y. L. Chang et al., Sporae Pterid. Sin. 51, pl. 5: 24-27. 1976; Fl. Xizang. 1: 31, f. 10: 1-2. 1983; P. S. Wang et X: Y. Wang inGuizhou Sci. 2: 50, 1983; Dixit, Census Ind. Pterid. 19. 1984; K. Iwats. et S. K. Wu et al. in J. Fac. Sci. Uni. Tokyo III. 14: 13. 1986; H. S. Kung, Fl. Sichuan. 6: 83, pl. 25: 1-2. 1988; Bir et al. in Ind. Fern. J. 6: 37. 1989; P. S. Wang, Pterid. Fanj ing Mt. Nat. Res. 26. 1992: Fl. Dulongjiang Reg. 3. 1993: C. M. Zhang in W. T. Wang, Keys Vasc. Pl. Wuling Mts. 9. 1995; L. B. Zhang et H. S. Kung in X. C. Zhang et K. H. Shing, Ching Mem. Vol. 84. 2000. ——E. diffusum D. Don var. paucidentatum C. N. Page in Fern Gaz. 11 (1) : 31, f. 3: a. 1974. ——E. mekon-gense C. N. Page, l. c. 36. f. 3: d. f: 9.
  中小型植物。根茎横走，直立或斜升，黑棕色，节和根密生黄棕色长毛或光滑无毛。地上枝当年枯萎。枝一型。高10-30 (70)厘米，中部直径1-2毫米，节间长1.5-6.0厘米，绿色，但下部1-3节节间黑棕色，无光泽，分枝多。主枝有脊4-10条，脊的两侧隆起成棱伸达鞘齿下部，每棱各有一行小瘤伸达鞘齿，鞘筒狭长，下部灰绿色，上部黑棕色；鞘齿5-10枚，披针形，先端尾状，革质，黑棕色，有一深纵沟贯穿整个鞘背，宿存。侧枝纤细，较硬，圆柱状，有脊4-8条，脊的两侧有棱及小瘤，鞘齿4-6个，三角形，革质，灰绿色，宿存。孢子囊穗圆柱状，长1-9厘米，直径4-8毫米，顶端钝，成熟时柄伸长，柄长1-3厘米。
  产甘肃、上海、江苏、湖南、广西、四川、重庆、贵州、云南、西藏。海拔0-3400米。日本、印度、尼泊尔、锡金、不丹，缅甸、越南有分布。

《Flora of China》 Vol. 2-3 (2013)
Equisetum diffusum  D. Don Prodr. Fl. Nepal. 19. 1825.
披散木贼   pi san mu zei
Equisetum diffusum var. paucidentatum C. N. Page; E. mekongense C. N. Page.
Plants small to medium-sized. Rhizome creeping, erect, or ascending, blackish brown, nodes and roots with dense long yellowish brown trichomes or glabrous. Aerial stems annual, monomorphic, 10-30(-70) cm tall, 1-2 mm in diam. at middle, much branched; internodes 1.5-6 cm, green but those of lower 1-3 nodes blackish brown, not lustrous. Main stem 4-10-ridged; each side of ridge raised and forming edges reaching lower sheath teeth; each edge with a row of tubercles reaching sheath teeth; sheath tubes long, narrow, grayish green in lower portion, blackish brown in upper portion, with a deep groove going through back of sheath; sheath teeth 5-10, blackish brown, lanceolate, leathery, caudate at apex, persistent. Lateral branches slender, rigid, terete, 4-8-ridged; each side of ridge with edges and tubercles; sheath teeth 4-6, grayish green, deltoid, leathery, persistent. Strobilus terete, 1-9 cm, 4-8 mm in diam., apex blunt; stalk prolonged when mature and 1-3 cm.
Under bushes, roadsides; sea level to 3400 m. Chongqing, Gansu, Guangxi, Guizhou, Hunan, Jiangsu, Sichuan, Xizang, Yunnan [Bhutan, NE India, Japan, Kashmir, Myanmar, Nepal, Pakistan, Vietnam].
Equisetum ×wallichianum C. N. Page (Fern Gaz. 11: 34. 1975), possibly a hybrid between E. diffusum and E. arvense, was described from China (possibly W Sichuan) and is said to be distributed in India and Nepal.