HYDROCHARITACEAE 81 



with an entire lanceolate blade 1% or 2 inches long, or the blade wholly obso- 

 lete; whorls numerous; pedicels 4 to 12 lines long; petals orbicular with 

 truncatish or broadly subcordate* base, 7 to 10 lines broad, broader than long ; 

 stamens 22 to 30, the filaments about as long as the anthers, dilated at base; 

 achenes with acute margins, the sides with an ear-shaped depression margined 

 by a narrow wing and with one or two tube-like passages in the spongy peri- 

 carp near the ventral angle. 



Lower San Joaquin River islands and shores: Lathrop (K. Brandegee, Sept. 

 1907, fls. & fr.) to Stockton. 



Kefs. SAGITTARIA GREGGII J. G. Sm. Eep. Mo. Bot. Gard. 6: 43, pi. 12 (1894), type loe. 

 Stockton, Sanford, July, 1893; Smith, 1. c., says that a plant collected by Dr. J. Gregg at 

 Zamora, Michoacan, Mexico, seems to be the same as the Californian plant. 



4. S. sanfordii Greene. Leaves 2 to 3 feet long; petioles obtusely trique- 

 trous, 1/2 to l l /2 inches thick at the base; blades linear- to oblong-lanceolate, 

 4 or 5 inches long, tapering into the spongy petiole, or almost obsolete in sub- 

 mersed plants ; scapes stout, 1% feet high or more ; whorls of flowers usually 

 few; sepals ovate, 2 to 3 lines long; achenes 1 line long, winged on both the 

 inner and outer margins, the sides reticulated; beak nearly erect, short, tri- 

 angular. 



Sloughs and pools, lower San Joaquin River. About 100 acres of pure growth 

 occurs just below the San Joaquin Bridge near Banta. 



Kefs. SAGITTARIA SANFORDII Greene, Pitt. 2: 158 (1890); J. G. Sm. Eep. Mo. Bot. Gard. 

 6: 57, pi. 28 (1894); K. Brandegee, Zoe, 4: 103 (1893). 



5. S. montevidensis C. & S. Stout; leaves sagittate, strongly many-ribbed; 

 flowers 1 to H/4 inches broad; petals white, with a brownish purple spot at 

 base ; fruiting heads of achenes very large, % to li/4 inches in diameter. 



Introduced at Stockton and Penryn. 



Eefs. SAGITTARIA MONTEVIDENSIS C. & S. Linnaea, 2: 156 (1827) ; J. G. Sm. Eep. Mo. Bot. 

 Gard. 6: 57, pi. 29 (1895); Eastwood, Erythea, 7: 150 (1899). 



HYDROCHARITACEAE. FROG'S BIT FAMILY. 



Aquatic herbs with dioecious or polygamous regular flowers from a spathe. 

 Stamens 3 to 12. Ovary 1 to 3-celled; inferior; stigmas 3 or 6. Fruit maturing 

 under water, many-seeded, indehiscent. Genera 14, all continents. 



1. ELODEA Michx. 



Perennial herbs. Leaves opposite or whorled, crowded, sessile, pellucid. 

 Flowers polygamo-dioecious, solitary and sessile, arising from a tubular 2-cleft 

 axillary spathe. Staminate flowers minute., with 6-parted perianth (3 sepals, 

 3 petals), and 9 short stamens. Pistillate flowers with 3 calyx-lobes and 3 

 petals, its long calyx-tube at base coherent with. the ovary; ovary 1-celled, with 

 3 parietal placentae; style capillary, coherent with calyx-tube; stigmas 3; 

 stamens 3 (sometimes rudimentary) or 6. Species about 5, North and South 

 America. (Greek elodes, marshy.) 



1. E. canadensis Michx. WATER-WEED. Stems slender, elongated, sub- 

 merged, 14 to 2 feet long, varying according to depth of the water; leaves 

 lanceolate to ovate or linear, 1 to 3 lines long; staminate flowers breaking off 

 in anthesis, rising to the surface and shedding their pollen around the pistillate 

 ones; pistillate flowers rising to and expanding on the surface by means of 

 the elongated (2 to 10 inches long) calyx-tube. 



Rare in California: Mendocino Co., ace. Bot. Cal. ; Truckee, K. Brandegee; 

 Egg Lake, Modoc Co., Baker. Nearly throughout North America. 



Eefs. ELODEA CANADENSIS Michx. Fl. Bor. Am. 1: 20 (1803); Anacharis canadenxis 

 Planchon; Wats. Bot. Cal. 2: 129 (1880). 



Jepson, Fl. Cal. vol. 1, pp. 65-81, Apr. 22, 1912. 



