Part 1, 1909] ALISMACEAE 59 
linear, acuminate, as long as the terminal lobe or somewhat longer; scapes usually taller 
than the leaves, 4-6-angled, simple or branched; whorls of the inflorescence several or 
numerous ; bracts lanceolate or linear-lanceolate, mostly 3-5 cm. long, attenuate; pedicels 
straight, those of the pistillate flowers 1-2 cm. long, those of the staminate flowers longer ; 
sepals ovate, becoming 10-12 mm. long; corolla about 2.5 cm. broad; filaments not dilated, 
glabrous ; fruit-heads 2-3 cm. in diameter; achenes cuneate-obovate to suborbicular, about 
2.5 mm. long, broadly winged, the minute beak erect over the ventral wing. 
TYPE LOCALITY : Western Missouri. 
DISTRIBUTION : Nova Scotia to Wisconsin, Missouri, and Kansas. 
ILLUSTRATION: Rep. Mo. Bot. Gard. 6: fi. 7. 
25. Sagittaria cuneata Sheldon, Bull. Torrey Club 20: 283. 1893. 
? Sagitiaria sagittifolia minor Pursh, Fl. Am. Sept. 395. 1814. 
Sagitiaria arifolia Nutt.; J. G. Smith, Rep. Mo. Bot. Gard. 6: 32. 1894. 
Sagittaria arifolia stricta J. G. Smith, Rep. Mo. Bot. Gard. 6: 34. 1894. 
Sagitlaria paniculata Blankinship, Mont. Agr. Coll. Sci. Stud. 1: 40. 1905. 
Sagitiaria arifolia monomorpha Lunell, Bull. Leeds Herb. 11: [2]. 1907. 
Sagitlaria arifolia dimorpha Lunell, Bull. Leeds Herb. : [3]. 1907. 
Sagitiaria artfolia polymorpha Lunell, Bull. Leeds Herb. 11: [3]. 1907. 
Sagitiaria arifolia cuneata Lunell, Bull. Leeds Herb. 1): [3]. 1907. 
Plants emersed and commonly 2-4 dm. tall, or submerged and varying in length with 
depth of the water, sometimes over 1 m. long; leaf-blades hastate to sagittate, 6-18 cm. 
long, the terminal lobe ovate to lanceolate, or rarely nearly linear, mostly acute or slightly 
acuminate, the basal lobes much narrower than the terminal one and longer than it or 
shorter, acute or acuminate, except sometimes in the case of imperfectly developed blades; 
phyllodia, when present, either relatively short and linear-lanceolate, or elongate and 
linear-attenuate ; scapes as long as the leaves or commonly shorter, simple or branched ; 
whorls of the inflorescence few or numerous; bracts lanceolate or linear-lanceolate, or 
rarely ovate-lanceolate, acuminate; pedicels straight, ascending, mostly 10-25 mm. long, 
or sometimes very short, those of the staminate flowers usually about twice as long as 
those of the pistillate flowers; sepals ovate to oblong-ovate, becoming 6-8 mm. long; 
corolla 2-2.5 cm. broad; filaments not dilated, glabrous; anthers oblong, as long as the 
filaments or longer; fruit-heads 1-1.5 cm. in diameter ; achenes obovate, 2-2.5 mm. long, 
with callous-thickened wings, the beak minute, erect over the ventral wing. 
TYPE LOCALITY: East Battle Lake, Otter Tail County, Minnesota. 
DISTRIBUTION : Nova Scotia and Maine to Quebec, British Columbia, Connecticut, Kansas, 
New Mexico, and California. : 
ILLUSTRATIONS: Bull. Torrey Club 20: f/. 159; Britt. & Brown, Ill. Fl. f 196 (as S. arifolia) 
J. 197 ; Rep. Mo. Bot. Gard. 6: 1.7, Engler, Pflanzenreich 45: /. 16,4, B, C (stamens and fruit). 
26. Sagittaria hebetiloba A. Nelson, Bull. Torrey Club 26: 6. 1899, 
Plants partially emersed, 2-5 dm. tall; leaf-blades ovate or ovate-hastate, 8-14 cm. 
long, the terminal lobe broadly ovate, the basal lobes ovate, much shorter and smaller than 
the terminal one, obtuse or rounded; scapes erect, simple or sparingly branched ; whorls 
of the inflorescence rather few; bracts linear-lanceolate, 1.5-2 cm. long, acuminate; ped- 
icels 1.5-2.5 cm. long, the pistillate and staminate about equal in length; sepals oval or 
ovate, becoming 7-8 mm. long; corolla about 2 cm. wide; filaments not dilated, glabrous; 
anthers about as long as the filaments; fruit-heads 10-15 mm. in diameter; achenes 
obovate, about 2 mm. long, winged all around, the beak minute, erect or nearly so over 
the ventral wing. 
TYPE LOCALITY: Platte Cafion, Laramie County, Wyoming. 
DISTRIBUTION: Known only from the type locality. 
27. Sagittaria pubescens Muhl. Cat. 86. 1813. 
Sagitlaria seer pubescens Torr. Comp. 356. 1826. 
Sagittaria variabilis pubescens Engelm. in A. Gray, Man. ed. 5. 493. 1867. 
Sagitiaria latifolia pubescens J. G. Smith, Mem. Torrey Club 5: 25. 1894. 
Plants partially or wholly emersed, 2-6 dm. tall; leaves erect or nearly so, the blades 
oblong or broadly ovate, or rarely hastate or sagittate, 8-25 cm. long, pubescent, the ter- 
minal lobe ovate, orbicular-ovate or lanceolate, usually abruptly pointed; the basal lobes 
