HYDEOCHAEITACEAE 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 

 truneatish 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. 



Lo\ter San Joacjuin River islands and shores: Lathrop {K. Brandegee, Sept. 

 1907, fls. & fr.) to Stockton.- 



Ri'fs.— S.\c;iTTARiA UKEGGII J. G. Sm. Eep. Mo. Bot. Gard. 6: 43, pi. 12 (189-t), type loc. 

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

 Zanioni, Michoaean, Mexico, seems to be the same as the C'alifornian plant. 



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

 trous, 1,2 to 1'/- iuches 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, ly^ 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. 



Refs.— Sagitt.\ria saxfordii Greene, Pitt. 2: 1.58 (1890); J. G. Sm. Rep. Mo. Bot. Gard. 

 6: 57. pi. 2S (1S94) ; K. Brandegee, Zee, 4: 103 (1893). 



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

 flowers 1 to I14 iuches broad; petals white, with a brownish purple spot at 

 base; fruiting heads of achenes very large, % to' I14 inches in diameter. 



IntToiluced at Stockton and Penryn. 



Refs. — S.^gittaria montevidensis C. & S. Linnaea, 2: 156 (1827) ; J. G. Sm. Rep. Mo. Bot. 

 Gard. 6: 57, pi. 29 (1S95) ; Eastwood, Erythea, 7: 150 (1899). 



HYDROCHARITACEAE. Frog's Bit Family. 



A(iuatic herbs with dioecious or polygamous regular flowers from a spathe. 

 Stamens 3 to 12. Ovarj' 1 to 3-celled, inferior; .stigmas 3 or 6. Fruit maturing 

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



1. ELODEA Michx. 



i'crcnnial 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; ovar.y 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 ilichx. Watee-weed. Stems slender, elongated, sub- 

 merged, 1/4 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, Jlodoc Co., Baker. Nearly throughout North America. 



Refs. — Elodea canadensis Michx. Fl. Bor. Am. 1: 20 (1803); Anacharis canadennis 

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



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



