434 CALLITRICHACEAE 



Locs. — Coast Ranges: Eureka, Tracy 2975; Miranda, Humboldt Co., Tracy 6948; Calistoga, 

 Jcpson 13,810; Yountville, Napa Valley, Jcpson 13,S20; Shellville, Sonoma Co., Fenley 588; betw. 

 Bolinas and Olcma, Marin Co., Mason 6805 (styles deciduous, representing the phase C. nuttallii 

 Torr.) ; Eichmond, Contra Costa Co., Fenley 709; Cerrito Creek, Berkeley Hills, Tracy 2068; 

 Puerto Canon, w. Stanislaus Co., Brewer 125G (C. nuttallii Torr.) ; Bloomquists Mills, San Mateo 

 Co., Fenley G73, Moson 3097 (C. nuttallii Torr.); Tres Pinos, San Benito Co., Jepson 16,124; 

 Santa Lucia ranger sta., Santa Lucia Mts., Fenley 651, 659. Great Valley: Vacaville, Jepson 

 1195; Waverlcy, San Joaquin Co., San ford 360; Califa, Madera Co., Jepson 15,165. San Ber- 

 nardino Valley: Red Hill near Upland, Parish 11,153. The phase knowTi as C. nuttallii Torr. was 

 segregated mainly upon hypogaeous fruits. Its infrequent occurrence and close similarity to C, 

 marginata suggest that it is a habitat form of the same plant which appears later in the season 

 when the pools are drying up. 



Var. longipedunculata Jepson. Plants usually aquatic; stems filiform, 3 to 12 (or rarely 

 24) inches long; herbage with conspicuous stellate pits; blades of the aquatic and emersed leaves 

 mostly similar (linear and intermediate leaves few), spatulate to round-obovate, 3-nerved, some- 

 times slightly emarginate, % to 2^/^ lines long; petioles ^/a to 1% lines long; bracts present, 

 usually large and conspicuous, obovate (rarely filiform), ^ to % line long; stamens in the axils 

 2, 1 or none, the filaments Vu to 1 line long ; fruit narrowly winged, at first sessile, later develop- 

 ing a peduncle 2 to 12 (or 24) lines long. — Fresh or stagnant pools (rarely terrestrial), 10 to 

 650 feet: Sonoma Co. to Contra Costa Co.; central Great Valley; Sierra Nevada foothills from 

 Calaveras Co. to Merced Co. ; western San Diego Co. Feb. -Apr. 



Note on variation and habitat. — The variety longipedunculata is distinguished from Calli- 

 triche marginata mainly by the presence of bracts and by longer peduncles. Since the bracts 

 vary from conspicuous to minute in the same individual, the short additional step of complete 

 absence is to be expected. The peduncles of this variety range in length beyond the upper limit 

 for C. marginata but in most specimens examined fall within that limit. There seems to be no 

 geographic segregation, although there may be a difference in habitat ; the variety longipeduncu- 

 lata, according to K. Fenley, is more aquatic or amphibious than the species and often inhabits 

 stagnant pools, 



Locs. — Central Coast Ranges: Santa Rosa, Fenley 594 ; Livermore, If ason 6807, 6808; Briones 

 road. Contra Costa Co., Mason 715; Walnut Creek, Contra Costa Co., Fenley 708. Great Valley: 

 Redding, BlanTcinship ; Dozier sta., Solano Co., Jepson 12,398; Stockton, Mason C6; Oakdale, 

 Stanislaus Co., Eormay 702; Wide-awake Ranch, Madera Co., Jepson 15,155. Sierra Nevada 

 foothills: Valley Sprs., Calaveras Co., Mason 5198; Rawhide, Tuolumne Co., Hormay 711; Snell- 

 ing road, Merced Co., Hormay 706a, 706b. San Diego Co.: Camp Kearney, Harold Paries 366. 



Refs. — Callitriche marginata Torr. Pac. R. Rep. 4:135 (1857), type loc. Mark West Creek, 

 Bigelow; Jepson, Fl. W. Mid. Cal. 264 (1901), ed. 2, 248 (1911), Man. 602 (1925). C. peduncu- 

 losa Nutt. Trans. Am. Phil. Soc. n. ser. 5:140 (1837), type loc. "from Arkansas to the Pottoe 

 etc.," Kuttall; not C. pedunculosa Arnott, ace. Morong, Bull. Torr. Club 18:235 (presumably a 

 prior homonym), nor C. pedunculata DC. (1805). C. nuttallii Torr. Pac. R. Rep. 4:135 (1857). 

 Var. LONGIPEDUNCULATA Jepson, Man. 603 (1925). C. longipedunculata Mor. Bull. Torr. Club 

 18:236 (1891), type loc. San Diego, Orcutt. 



2. C. palustris L. Water Fennel. Aquatic or amphibious plants; stems 

 leafy, in terrestrial plants 2 to 6 inches long, in aquatic plants 6 to 18 inches long; 

 floating, submersed and intermediate leaves all well-developed; blades of sub- 

 mersed leaves linear, sometimes notched at apex, 1-nerved, 3 to 8 (or 10) lines long; 

 floating leaves sometimes forming a terminal rosette, their blades round-obovate 

 to spatulate, 3-nerved, the apices entire or emarginate, l^/^ to 3 (or 5) lines long; 

 petioles of floating type of leaf winged, 1 to 2 lines long; stellate pits present; 

 floral bracts i^ to l^/^ lines long; filaments 1 to 2^2 (or 3I/2) lines long; styles more 

 or less persistent, usually 1 to 2 lines long, 2 to 3 times as long as carpels; fruits 

 roundish-elliptical in outline, flattened, slightly notched at apex, about Y2 line 

 long, the carpels narrowly margined, the approximate ones with a deep groove 

 between. 



Cool fresh pools or slow streamlets, or more rarely terrestrial at water's edge, 

 100 to 7400 feet : Coast Ranges from Siskiyou Co. to San Mateo Co. ; Sierra Nevada 

 from Lassen Co. to Fresno Co.; east side of Great Valley; San Bernardino Mts. 

 East to the Atlantic, north to Canada. South America, Europe, Asia. Mar.- Aug. 

 (fl. andfr.). 



Locs. — Coast Ranges: Oro Fino Creek, Siskiyou Co., Butler 406; Bald Mt., Humboldt Co., 

 Tracy 4950; Blue Lake, Humboldt Co., Tracy 2994; Ukiah, Bolander 4658; Calistoga, Tracy 

 1849; Howell Mt., Napa Co., Tracy 1614; Cazadero, Sonoma Co., Davy 1665; betw. Santa Rosa 



