Z A NICHELLI ACE AE. 
13 
4. Potamogeton Zizii M. & K. In lakes and streams from Que. to Ida., Fla. 
and Texas.—Cerro Summit. 
5. Potamogeton heterophyllus Schreb. In still or flowing water from Lab. 
to B. C., Fla. and Calif.—Alt. 5000-6000 ft.—Near Boulder. 
6. Potamogeton lucens L. In ponds and lakes, from N. Sc. to Fla. and 
Calif.—Cottonwood Lake. 
7. Potamogeton Richardsonii (Bennett) Rydb. (P. perfoliatus lanccolatus 
Robbins) In lakes, ponds and slow streams from Newf. to Alaska, Del. and 
Calif.—Alt. about 8000 ft.—Tomichi River. 
8. Potamogeton foliosus Raf. In streams and ponds from N. B. to B. C., 
Fla. and Calif.—Alt. 4000-9000 ft.—North Platte River, below Hebron; Grand 
River, Sulphur Springs; Platte River, Denver. 
9. Potamogeton pusillus L. In slow streams and ponds from N. B. to B. C., 
N. C. and Calif.—Alt. 4000-8000 ft.—Base of Pike’s Peak; Brantly Canon, 
Las Animas Co.; Alamosa. 
10. Potamogeton filiformis Pers. In ponds and lakes from Anticosti to 
B. C., N. Y. and Colo.—Alt. 4000-9000 ft.—Twin Lakes; Walsenburg; Grand 
Lake. 
11. Potamogeton interior Rydb. (P. tnarinus occidentalis Robbins) In 
lakes and slow streams from Alb. to Colo, and Nev.—Alt. 6500-10,000 ft.— 
San Luis Valley; Ironton Park, nine miles south of Ouray; Tomichi River; 
Gunnison; Hamor’s Lake, Durango. 
12. Potamogeton pectinatus L. In fresh, alkaline or salt water from N. B. 
to Alaska, Fla. and Low. Calif.—Alt. 4000-10,000 ft.—Twin Lakes; New 
Windsor; lake near Ft. Collins; Grizzly Creek; Trapper’s Lake; Lee’s Lake, 
Ft. Collins. 
2. ZANICHELLIA L. Zanichellia. 
1. Zanichellia palustris L. In fresh and alkaline ponds and streams especi¬ 
ally with sandy bottoms from Mass, to Wash., Fla. and Calif.; also in the 
Old World.—Alt. 4000-9000 ft.—Ft. Collins; Platte River, Denver; stream 
twelve miles below Grand Lake; swamp along Poudre River. 
Family 14. NAIADACEAE Lindl. Naias Family. 
1. NAIAS L. Naias. 
1. Naias guadalupensis (Spreng.) Morong. In brackish and alkaline water 
from Kane., Nebr. to Ore., Fla. and Texas; Tropical America.—Lee’s Lake, Ft. 
Collins. 
Order n. ALISMALES. 
Petals similar to the sepals ; anthers long and narrow; carpels coherent. 
Fam. 15. SCHEUCH SERI ACEAE. 
Petals different from the sepals, in ours white ; anthers short and thick; carpels 
not coherent. 
Fam. 16. Alismaceae. 
