VASCULAR PLANTS OF NORTH DAKOTA 159 
2. Woodsia obtusa (Spreng.) Torr. Cat. Pl. in Geol. Rep. 
Wi. Y.-195,. (1840). 
Dickinson (Cl. Waldron). 
3. Woodsia oregana D. C. Eaton. Can. Nat. 2:90 (1865). 
Morton Co.: Coffin Butte (Bell). 
CYSTOPTERIS Bernh. Schrad. Neues Journ. Bot., I. pt. 
2: 26, (1806). 
4. Cystopteris fragilis (Linn. 1762) Bernh. Schrad. Neues 
Journ. Bot. 1. c. 27, (1806). 
In the western part of the State. 
Family 3. MARSILEACEAE R. Brown. Prod. FI. Nov. 
Holl. 1:166, (1810). 
MAS iA Linn. 9p.5 Pl, regg.) (1753). 
5. _Marsilea mucronata A. Br. Amer. Journ. Sci. (II.) 3:55, 
(1847). 
Leeds (extinct); Butte (extinct). 
6. Marsilea oligospora L. N. Good. Bot. Gaz. 33:66, (1902). 
La Moure Co.: Edgeley (Cl. Waldron). 
Family 4. EQUISETACEAE Mich. Fl. Bor. Am. 2:281, (1803) 
FOOTSEDRU.M Pitnius 15) :26)\Co B, 
7. Equisetum arvense (C. Bauhin) Linn. Sp. Pl. p. 1061, 
(1753). 
Across the state. 
8. Equisetum fluviatile Linn. Sp. Pl. 1062, (1753). 
Leeds, Pleasant Lake. 
9. Equisetum fluviatile limosum Linn. Sp. Pl. 1062 (1753). 
Leeds, Towner, Pleasant Lake. 
10. Equisetum hiemale var. affine (Engelm.) A. A. Eaton 
in Fern. Bull XI. 75, 111 (1903). 
Leeds, Butte. 
11. Equistetum hiemale var. intermedium A. A. Eaton 
Bern, Bull, -X.,.120., (f902),,.X1.; To8., (7903). 
Leeds, Butte; McHenry Co.: Towner, Sand Hills. 
12. Equisteum hiemale f. polystachyon Prayer in Gilbert, 
List N. A. Pterid, 8, 26, (1901). 
Benson Co. Comstock. 
13. Equisetum hiemale var. pumilum A. A. Eaton, Fern. 
Bulb, M1. .75,. 141 ¢ (1903): 
Leeds. 
14. Equisetum hiemale f. ramigerum A. Br. in Gilbert, 
