9. Equisetum variegatum Schleicher ex F. Weber & D. Mohr, Bot. Taschenbuch. 60, 447. 1807.
斑纹木贼 ban wen mu zei
Plants small to medium-sized. Rhizome erect and creeping, blackish brown, nodes and roots with long yellowish brown trichomes. Aerial stem perennial, monomorphic, green, 10-20 cm tall, 1-1.5 mm in diam. at middle, not branched; internodes 1.5-4 cm. Aerial stem 6-8-ridged, ridge abaxially nearly rectangular or arc-shaped, middle portion with or without shallow grooves, with 1 row of tubercles on each side; sheath ca. 0.2 cm, green but distal and middle portion with a blackish brown band; sheath teeth 6-8, usually spreading, deltoid, ca. 0.1 cm, teeth of middle portion blackish brown, white at margin, membranous, abaxially 4-ridged at base, apex acute and shortly aristate, persistent. Strobilus ellipsoid, 0.5-0.8 cm, 0.2-0.4 cm in diam., apex with acute tip, sessile. 2n = 216.
Forests, under bushes, valleys, meadows, roadsides; 100-3700 m. ?Jilin, Liaoning, Nei Mongol, Sichuan, Xinjiang [Japan, Mongolia, Russia; SW Asia, Europe, North America (including Greenland)].
