BUCKWHEAT FAMILY 383 



to Washington and east to Colorado. Probably no more than a low-branch- 

 ing form of P. watsonii. 



Loes. N. Fork Kings Biver, Hall $ Chandler 4431; Ostrander's Mdw. near Yosemite, 

 Bolander 6005; Lake Merced, Jepson 4421; Placer Co., Carpenter; Lassen Peak, Jepson 4075. 



Eefs. POLYGONUM IMBBICATUM Nutt. ; Wats. Am. Nat. 7: 665 (1873), type from the 

 western U. S.; Piper, Contrib. U. S. Nat. Hb. 11: 228 (1906). P. Tcelloggii Greene, Fl. Fr. 

 134 (1891), type loc. Donner Lake; Small, Monog. N. Am. Polygonum, 134, pi. 54 (1895). 



20. P. watsonii Small. Annual; stem simple or branching above the base, 

 erect, ^ to 4 inches high, the terminal portion of the stem or branches crowded 

 with leaves and flowers; leaves linear to lanceolate, % to 1 inch long or the 

 uppermost 1 to 3 lines long; stipules deeply cleft into 2 lanceolate or ovate 

 acuminate entire segments; flowers whitish or rose-color, 1 or 2 in each axil; 

 stamens 3 to 5 ; styles evident ; achene dark or black, the surface lightly lineate 

 or very shallowly alveolate. 



Alpine or subalpine, Sierra Nevada, 9000 to 10,000 feet, south to Mt. San 

 Jacinto, north to British Columbia and east to Colorado. 



Locs. Willow Creek, Modoc Co., Austin; Truckee, Sonne; Cisco, Harriet Walker 1299; Snow 

 Creek, Yosemite, Hall 9187 ; Eagle Peak, Yosemite, Jepson 4371 ; Pine Ridge, Fresno Co., 

 Hall $ Chandler 191 ; West Vidette, Jepson 826 ; Kearsarge Pass, Jepson 883 ; Cottonwood 

 Creek, Inyo Co., Jepson 5071 ; Mt. San Jacinto, Hall 2354. 



Eefs. POLYGONUM WATSONII Small, Monog. N. Am. Polygonum, 138, pi. 56 (1895), ex- 

 cluding syn. type from the western U. S.; Piper, Contrib. U. S. Nat. Herb. 11: 228 (1906). 



21. P. californicum Meisn. Slender wiry glabrous annual, 3 to 7 inches high, 

 diffusely branched, the ultimate branches elongated and floriferous; leaves 

 linear to filiform, cuspidate, 3 to 8 lines long, the back with strong midrib and 

 revolute-ribbed on each margin; spikes often loose below, usually dense above 

 with the sheaths overlapping ; bracts lanceolate or subulate, 1 to 3 lines long ; 

 sheaths split to the middle or to the base into setaceous divisions ; sepals white 

 with rose-colored midvein; achene brown. 



Dry foothills, Sierra Nevada and North Coast Ranges ; north to Washington. 

 July. 



Locs. N. Fork Kaweah, Jepson 580; Hazel Green, Yosemite Park, Jepson; La Grange, 

 Jepson; Sheep Ranch, Calaveras Co., Davy 1613; Milton, Davy 1227; lone, Braunton 1228; 

 Sweetwater, El Dorado Co., K. Srandegee; Chico, B. M. Austin; Napa Valley, Jepson; Blue 

 Lakes to Ukiah, Jepson; Mt. Sanhedrin, Jepson; Hullville, Lake Co., Heller 6066; Van Duzen 

 River, Tracy 2922. 



Refs. POLYGONUM CALIFORNICUM Meisn. in DC. Prodr. 14: 100 (1856), type loe. east 

 side of the Sacramento Valley, Harticeg 1944; Small, Monog. N. Am. Polygonum, 142, pi. 

 58 (1895); Jepson, Fl. W. Mid. Cal. 160 (1901). P. greenei Wats. Proc. Am. Acad. 14: 295 

 (1879), type spms. from Shasta Valley, Greene, and Chico, Mrs. Bidwell; Small, Monog. N. 

 Am. Polygonum, 144, pi. 59 (1895) ; this is habitally like P. californicum, and is technically 

 without distinctive characters. 



22. P. parryi Greene. Dwarf compact annual, commonly branching from 

 the base, 1 to 2 inches high ; stems rigid and brittle, spike-like, because densely 

 crowded with leaves and flowers even to the base; leaves narrowly linear, 

 acute, cuspidate, 1 to 4 lines long ; stipules so extremely lacerate as to appear 

 cottony, and often hiding the flowers ; achene triangular, chestnut-color. 



Sierra Nevada; higher North Coast Ranges; north to Washington. June- 

 July. 



Locs. Howell Mt., Tracy 1550; Gravelly Valley, Lake Co., Jepson; Buck Mt., Humboldt 

 Co., Tracy 2832; Bear Valley, Nevada Co., Jepson. 



Refs. POLYGONUM PARRYI Greene, Bull. Torr. Club, 8: 99 (1881), type loc. Yosemite 

 Valley, Parry; Small, Monog. N. Am. Polygonum, 146, pi. 60, fig. 1 (1895). 



23. P. bidwelliae Wats. Annual; stems divergently branched, 1 to 4 

 inches high ; leaves linear, 3 to 5 lines long, with a strong midrib and two mar- 

 ginal nerves on back; stipules ovate, sharply serrate or at length lacerate, 

 imbricated on the spikes; calyx rose-color. 



Chico; not otherwise known. 



