80 ALISMACEAE 



Refs. LOPHOTOCARPUS CALYCINUS J. G. Sm. Eep. Mo. Bot. Gard. 11: 147 (1899). Sagit- 

 taria calycina Engelm. in Torr. Bot. Mex. Bound. 212 (1859). Lophotocarpus calif ornicus J. G. 

 Sm. Rep. Mo. Bot. Gard. 11: 146, pi. 54 (1899), type from Coyote Creek, Los Angeles Co., 

 Parish Bros. 1136. L. fluitans J. G. Sm. Rep. Mo. Bot. Gard. 11: 145, pi. 53 (1899). 



5. SAGITTARIA L. ARROW-HEAD. 



Marsh or aquatic perennial herbs with thickened or tuberous rootstocks, 

 fibrous roots and milky juice. Leaves sheathing the stem at base; earlier 

 leaves (phyllodia) destitute of blades, later producing small entire blades or 

 most commonly sagittate blades. Flowers pediceled, borne in whorls of 3 on 

 the upper part of the stem, with membranous bracts. Flowers monoecious 

 (rarely dioecious), the staminate above. Petals longer than the sepals. Sta- 

 mens numerous, inserted above the receptacle. Ovaries indefinitely numerous, 

 crowded on a globose receptacle. Achenes flat, winged or margined, beaked 

 by the short style. Species about 25, mostly North and South America, a few 

 in Europe and Asia. (Latin sagitta, an arrow, referring to the shape of the 

 leaves.) 

 Sepals of pistillate flowers reflexed or spreading, not accrescent. 



Pedicels of pistillate flowers slender, ascending; leaves (or some of them) with sagittate 



lobes. 



Basal lobes equaling or shorter than the terminal one; achenes without wings or crests 

 on sides. 



Achenes with prominent horizontally oblique beak 1. S. latifolia. 



Achenes with minute erect beak 2. S. arifolia. 



Basal lobes longer than terminal one; achenes almost beakless, the sides with a prom- 

 inent wing-margined depression 3. S. greggii. 



Pedicels of pistillate flowers much thickened, reflexed in fruit; leaves not sagittate. ..... 



4. S. sanfordii. 

 Sepals of the pistillate flowers erect and accrescent 5. S. montevidensis. 



1. S. latifolia Willd. TULE POTATO. Leaf-blades sagittate, very variable in 

 outline and size, 2 to 12 inches long; basal lobes lanceolate to broadly ovate, 

 acuminate, commonly divaricate, y 2 to as long as the terminal lobe; scape sim- 

 ple or branched, i/4 to 3 feet high ; flowers monoecious or dioecious ; stamens 20 

 to 25; achene 1.y 2 lines long, with somewhat swollen dorsal wing and long 

 horizontally oblique beak. 



Rivers and deltas of the Sacramento and San Joaquin valleys, especially 

 abundant on the river islands; swamps and meadows in the Sierra Nevada to 

 6000 feet. Los Angeles north to British Columbia. Almost throughout North 

 America. The edible tubers are used by the Chinese of the lower Sacramento. 



Refs. SAGITTARIA LATIFOLIA Willd. Sp. PI. 4: 409 (1806); Jepson, Fl. W. Mid. Gal. 105 

 (1901); Abrams, Fl. Los Ang. 18 (1904). S. variabilis Engelm. in Gray, Man. 461 (1848); 

 Wats. Bot. Cal. 2: 201 (1880). 



2. S. arifolia Nutt. Very near the preceding ; leaf-blades sagittate, 2y 2 to 7 

 inches long; terminal lobe ovate to lanceolate or nearly linear; basal lobes 

 narrower than the terminal ; scapes as long as the leaves or commonly shorter ; 

 flowers monoecious; achenes obovate, 1 to l 1 /^ lines long, winged all around, 

 bearing a minute erect beak. 



San Bernardino Mts. through the Sierra Nevada to Lassen Co.. north to 

 British Columbia and east to New Mexico and Nova Scotia. 



Refs. -SAGITTARIA ARIFOLIA Nutt.; J. G. Sm., Rep. Mo. Bot. Gard. 6: 32, pi. 1 (1894). 

 S. cuneata Sheldon, Bull. Torr. Club, 20: 283, pi. 159 (1893). 



3. S greggii J. G. Sm. Plants 2 to 4 feet high ; leaf -blades 8 to 16 inches 

 long, on long petioles; basal lobes lanceolate, acuminate, widely divergent, 

 longer than the lanceolate or ovate, acuminate terminal one ; submersed leaves 



