382 POLYGONACEAE 



California; north to Saskatchewan and east to the Atlantic. 

 Locs. Pasadena, Grant 1020; Yosemite, Hall 9131. Rarely noted in Cal. 

 Refs. POLYGONUM BAMOSISSIMUM Michx. Fl. Bor. Am. 1: 237 (1803), type loc. Illinois, 

 P. erectum Wats. Bot. Cal. 2: 11 (1880), not L. 



16. P. minimum Wats. Annual; stems usually several from the base, 2 

 to 4 (or 6) inches long, ascending; herbage glabrous, scaberulous at the nodes; 

 leaves ovate or elliptic, 2 to 6 lines long, apiculate, evenly distributed or some- 

 what crowded at ends of branches; flowers in all the axils, greenish white; 

 stamens 5 to 8; achene slightly exserted, black, smooth, shining. 



Central Sierra Nevada to Siskiyou Co., 4000 to 7000 feet; north to Alaska, 

 east to Utah. 



Locs. Mt. Watkins, Hall 9170; Donner, Brandegee; Shackelford Creek, Butler 1776. 

 Refs. POLYGONUM MINIMUM Wats. Bot. Kings, 315 (1871), type loc. Wahsateh and Uintah 

 mountains, Utah; Small, Monog. N. Am. Polygonum, 128, pi. 51 (1895). 



17. P. douglasii Greene. Annual, mostly sparingly branched and strictly 

 erect, 8 to 21 inches high; leaves linear-oblong or -lanceolate, acute, thinnish, 

 1 to 114 inches long; sheaths lacerate; flowers reddish, 2 lines long, scattered, 

 on deflexed pedicels; achene triquetrous, jet-black, smooth and shining. 



High mountains, California, 4000 to 8000 feet; north to British Columbia, 

 east to Texas and Maine. 



Loes. Volcano Creek, Jepson 956 ; Yosemite, Jepson 5668 ; Bear Valley, Nevada Co., 

 Jepson; South Yollo Bolly, Jepson. The following have the achene smooth and shining on 

 the angles but otherwise dull black and slightly roughened like morocco leather: Bluff Lake, 

 San Bernardino Mts., Nora Pettibone; Bubbs Creek, Jepson 780; Sisson, Jepson. 



Var. latifolium Greene. Leaves oblong; flowers mostly crowded towards 

 the ends of the branches. Pacific Coast. 



Var. austinae Jones. Leaves ovate to lanceolate, 3 to 6 lines long; calyx 

 green with whitish margins, 1 line long; achene black, smooth and shining. 

 Modoc Co., northerly to Idaho. 



Eefs. POLYGONUM DOUGLASII Greene, Bull. Cal. Acad. 1: 125 (1885), type from western 

 America; Fl. Fr. 134 (1891); Small. Monog. N. Am. Polygonum, 118, pi. 46 (1895). Var. 

 LATIFOLIUM Greene, 11. cc. P. tenue Wats. Bot. Cal. 2: 12 (1880), not Miehx. Var. latifolium 

 Engelm. in Wats. 1. e. P. montanum Greene, PI. Bak. 3: 13 (1901). Var. AUSTINAE Jones, 

 Contrib. 12: 75 (1908). P. austinae Greene, Bull. Cal. Acad. Sci. 1: 212 (1885), type loe. 

 Modoc Co., sagebrush plains, E. M. Austin. 



18. P. spergulariaeforme Meisn. Annual, much branched and somewhat 

 diffuse, or sparingly branched and more strictly erect, 4 to 13 inches high; 

 sheaths with a short mostly scarious base and lacerate summit; leaves linear 

 or oblanceolate, 1-nerved, acute, % to 1% inches long; spikes 4 inches long 

 or less, very slender, the flowers much scattered below, crowded above ; calyx 

 rose-color or white ; stamens 8, included, the filaments hardly dilated at base ; 

 style as long as the ovary, 3-parted. 



Dry hills : North Coast Ranges to British Columbia in the coast region. Oct. 



Locs. Grouse Creek, Humboldt Co., Chesnut $ Drew; Sisson, Jepson; Humbug Creek, 

 Siskiyou Co., Butler 195. 



Refs. POLYGONUM SPERGULARIAEFORME Meisn.; Small, Bull. Torr. Club, 19: 366 (1892), 

 type loc. Pacific Coast; Small, Monog. N. Am. Polygonum, 130, pi. 52 (1895). P. coarctatum 

 Dougl.; Wats. Bot. Cal. 2: 12 (1880). P. howellii Greene, PI. Bak. 3: 14 (1901), type loc. 

 Siskiyou Mts., Howell. P. exile Eastw. Proc. Cal. Acad. ser. 3, Bot. 2: 286 (1902), type loc. 

 Kings Canon, Eastwood; stamens 3. 



19. P. imbricatum Nutt. Annual; stem branching from the base or some- 

 times simple, erect, 1 to 3 inches high, the upper leaves scarcely smaller but 

 crowded and with flowers crowded in their axils; leaves linear, acute, 3 to 

 5 lines long; stipules 2-cleft, the lower segments of each pair more or less 

 united ; flowers greenish white, very shortly pedicelled ; stamens 5 ; styles nearly 

 obsolete; achene brown, dull, smooth. 



Sierra Nevada, 6000 to 8000 feet, Yosemite Park to Donner Lake; north 



