14 SCHEUCHSERIACEAE. 



Family 15. SCHEUCHSERIACEAE Agardh. ARROW-GRASS FAMILY. 



1. TRIGLOCHIN L. ARROW-GRASS. 



Carpels 3 ; fruit linear-clavate, tapering to an awl-shaped base. i. T. palustris. 

 Carpels 6 ; fruit oblong or ovoid, obtuse at the base. 2. T. maritima. 



1. Triglochin palustris L. In marshes from N. B. to Alaska, N. Y. and 

 Colo.; also in Europe and Asia. Alt. 6500-10,000 ft. Lake John, North 

 Park; lola; Hamor's Lake, north of Durango; Grizzly Creek; Como; South 

 Park. 



2. Triglochin maritima L. In marshes, especially those that are more or 

 less alkaline or saline, from Lab. to Alaska, N. J. and Calif. Alt. 6500-10,000 

 ft. Parlin, Gunnison Co. ; Doyle's ; Trimble Springs, north of Durango ; Gyp- 

 sum, Eagle Co.; Tobe Miller's ranch; Steamboat Springs. 



Family 16. ALISMACEAE DC. WATER-PLAINTAIN FAMILY. 



Carpels in a ring on a flat receptacle. i. ALISMA. 



Carpels spirally arranged in several series on a convex or globose receptacle. 



2. SAGITTARIA. 



i. ALISMA L. WATER-PLANTAIN. 



i. Alisma Plantago L. (A. brevipes Greene) In water from Que. to 

 Wash., Colo, and Low. Calif.; also in Europe. Alt. 4000-9000 ft. Cerro 

 Summit ; La Porte, Larimer Co. ; La Plata River ; Piedra ; near the river, 

 Ft. Collins; Hubbard Creek, Delta Co. 



2. SAGITTARIA L. ARROW-HEAD. 



Basal lobes of the leaf-blades not longer than the blade proper. 



Beak of the achenes at a right angle to the body and of % its length or more ; 



bracts ovate. i. S. latifolia. 



Beak of the achenes erect, very short. 



Bracts lanceolate, 8-20 mm. long; petiole comparatively short; blade sel- 

 dom floating. 2. S. arifolia. 

 Bracts ovate-lanceolate, 4-6 mm. long; petioles very long; blades floating 



or none. 3. S. cuneata. 



Basal lobes of the leaf-blades 2-3 times as long as the blades proper. 



4. 5*. longiloba. 



1. Sagittaria latifolia Willd. In marshes and shallow water from N. B. to 

 B. C, Fla. and Tex. Lee's Lake, near Ft. Collins; along the river near Ft. 

 Collins. 



2. Sagittaria arifolia J. G. Smith. In shallow water and mud from Me., 

 Sask., B. C. and Mich, to N. M. and Calif. Alt. 4000-8500 ft. Near Boulder; 

 New Windsor, Weld Co. ; North Cheyenne Canon ; Alamosa ; Kremmling ; 

 La Porte road, near Ft. Collins. 



3. Sagittaria cuneata Sheldon. In lakes from Minn, to Sask., B. C. and 

 Colo. " Colorado." 



4. Sagittaria longiloba Engelm. In shallow ponds from Kans. to Colo., 

 Tex. and Sonora. Exact locality not given. 



