428 
Equisetaeeaj. 
— Teeth of the sheaths lanceolate-subulate, persistent, 
rough-prickly. Stem slenderer than in the last, with 
10—12 furrows.—Wollmatingerried near Constance, close 
to the Swiss frontiers. 4 * trachyodon A. Br. 2586. 
5. Sheaths surrounded by a black circle. Stem standing 
the winter, 10—20 cm, rarely more, branchy gen. only 
at the base, simple above, with 5—8 (rarely 12) furrows. 
—Sandy places; water-sides; distrib. 6 
variegatum Schleich. 2587. *) 
— Sheaths all of one colour or brownish above. Stem ann., 
50—120 cm and more, at most the thickness of a goose’s 
quill, gen. slenderer, branchy, rarely simple. E. ramosum 
Dec—Sandy places, water-sides; not everywhere (want¬ 
ing in B. O. U. L. S .). 4 . ramosissimum Desv. 2588. 
6 (2). Stem fairly slender, furrowed, gen. branchy. Sheaths 
loose, with 5 — 8 teeth; teeth lanceolate, broad-scarious. 
— Ditches, water-sides; distrib. 6 . palustre L. 2589. 
— Stem rather thick, smooth or only streaked, gen. simple. 
Sheaths closely applied, with 15 — 20 teeth; teeth sub¬ 
ulate, narrow-scarious.—Ponds, ditches; distrib. 5 
limosum L. 2590. 
7 (1). Fertile and barren stems developing at the same time, 
the former turning green later and bearing branches 8 
— Fertile stems appearing before the barren stems, always 
without branches, and dying after maturity . .9 
8. Sheaths of the fertile stems infundibuliform, with 10 to 
15 teeth. Branches of the barren stems gen. not rami¬ 
fied.—Shady places; G. W. (Engadine; Simplon, Saas, 
Zermatt, Anniviers, Sion). 4 . . pratense Ehrh. 2591. 
— Sheaths of the fertile stems almost campanulate, cleft 
in 3—6 parts (divisions each composed of 2—4 united 
teeth). Branches of the barren stems very fine, arched- 
pendant.—Damp woods and pasturages, especially in 
the mount, and subalp. 4 . . sylvaticum L. 2592. 
9. Sheaths of the fertile stems bearing 20—30 teeth. Barren 
stems often almost as thick as a little finger, ivory- 
white. E. maximum Lam. - Damp, shady places, forest- 
brooks; distrib. 3. . . . Telemateia Ehrh, 2593. 
— Sheaths of the fertile stems bearing 8—11 teeth. Barren 
stems green or greenish white, slenderer.—Fields, road¬ 
sides; everywhere. 3 arvense L. 2594. 
Second table. 
1. Fertile stems simple, whitish or brownish. E. arvense 
and Telemateia. 
— Fertile (and barren) stems gen. branched, green 2 
*) E. scirpoides Michx. See the appendix and N. Beitr. II, 12. 
