nUCKWllEAT FAMIIiV l}7!) 



SiiKill, Mum. Coliitiiliia CciU. Onpt. Bot. 1: :\2. pi. 3 (1895). P. pohimorphum Tiodcl).; Wjits. 

 Hot. Cal. 2: 1.5 (ISSil). P. phiitolai-carfolium Moisn.; Small, Bull. Torr. Club, 19: .^(iO (1892), 

 the typo from California; Mem. Columbia OoU. Dept. Bot. 1: 34, pi. 4 (1895). 



:>. P. davisiae lirow. Stems simple or spariiintly branched, .'i to 11 inehes 

 liij,'li. several from the crown of a thick taiiroot 1 or 2 inches in diameter; 

 leaves ovate or oblong-ovate, minutely pubescent, often glaucous, % to IV2 

 incites long, subsessile or shortly petioled ; flowers purplish green or yellowish, 

 2 to 4 in loose terminal or axillary clusters; aehene half exserted from the 

 jiorsistent calyx. 



High mountains, iiorllicrn Sierra Nevada and Norlli Coast Ranges, GOOO to 

 8000 feet. 



T,„cs.— Snow Mt. (ace. Zoo, 4: 175); South Yollo Bolly, Jcpson; Marble Mt., Jcpaon 2843; 

 Trinity Summit. Jepxon 2053; Salmon Mts., llall S()10; Mt. Shasta; Lassen Peak, Ti;. M. 

 Auslin; Placer Co., Carpenter ; Carson Spur, TIaiiscn 714. Mt. Lola, Nev., Kennedy ^ Dolnt. 



Refs. — Polygonum davishe Brew.; Gray, Proe. Am. Aca.l. 8: 399 (1.872), type loc. 

 northern Sierra Nevada, Brewer. Torrey, Mins N. J. Davii ; Small, Monog. N. Am. Polygonum, 

 38, ]il. (i (isfi5). P. nrwhcrryi Small; Merriam, N. Am. Fauna, 10: 145 "(1899). 



4. P. amphibium L. Water Persicaria. Aiiuatic glabrous perennial with 

 stout stems not branching above the rooting base; leaves floating, elliptical to 

 oblong or oblong-lanc(>olatc, truncate or rounded at base, 2 to 7 inches long on 

 jietioles ~/^ to 214 inches long; sheaths leaf-bearing at about the middle; spike 

 terminal, dense, ovate or oblong, i/> to 1 inch long, on a commonly short 

 peduncle; calyx bright rose-color, l''^ to 3 lines long, the 5 stamens and 2-cleft 

 style exserted; aehene lenticular. 



Ponds and lakes in Southern Calit'oriiia and tiic Sierra Xc^vada, north to 

 British Columbia and east to the Atlantic. Europe; Asia. Often terrestrial 

 and almost equally successful as a land or water plant. 



Locs. — Bluff Lake, San Bernardino Mts., A'ora Pcilihoiie ; Kern Canon, Jepson 1040; Hetch- 

 Hetchy, Chcoiut <^- Drew; Lake Tahoe, Brewer 2130; Donner Lake, TTellcr 7102; Placer Co., 

 Carpnitrr ; Silver Ijake, Lassen Co., Biil'er <f- Nvltiiifj. 



Var. hartwrightii Bissel. Sheaths rough-hairy, ciliate, usually witii an 

 abruptly spreading herbaceous margin. — Upper Sacramento Valley and north- 

 ern Sierra Nevada; eastward to the Atlantic. 



Refs. — Polygonum .^MrTuniuM L. Sp. PI. 301 (1753), type European; Sm,ill, Monog. N. 

 Am. Polygonum, 40, pi. 7 (1S95). Perairaria purpnrnta Greene, Leaflets, 1: 27 (1904), type 

 loc. Silver liake, Lassen Co., Baker 4" Nuttinn. P. msu/nit! Greene, 1. c. 32, type loc. San 

 Bernardino Mts., 9550 ft., Wright 1809. Var. hartvvri'giitii BLssel, Rhod. 4:"l05 (1902). 

 Poliiqonum hartwrii/htii Gray, Proc. Am. Acad. S: 294 (1.870), type loc. New York, H'art JFnV;/i(; 

 Greene, Fl. Fr. 130 (1891).' 



T). P. muhlenbergii Wats. Perennial, aquatic or in half dry places; stems 

 decumi)ent or suhcrect, 2 to 3 (or (j) feet high ; leaves and upper portion of the 

 simple stem usually appressed-hirsutulose or scabrous, the peduncle glandular 

 with short hairs; leaves thin, ovate-lanceolate to lanceolate, acuminate or even 

 attenuate, usually rounded at base, 3 to 8 in(dies long, the petioles 1 to SVs inches 

 long; sjuIkcs 1 to 4 inches long, often in pairs; calyx rose-color or pink, 5-parted 

 to tile middle; stamens 5, exserted; style 2-cleft; aehene lenticular. 



Lakes and sluggish streams from the coast to the Sacramento Valley. 

 Throughout North America. 



Locs. — Cache Sloiigli, Solano Co., Jepson; San Francisco, Jcpson; Gilroy, Jepson; San Tjuig 

 Obispo, Ji'ji.son 3009; ilciildsburg, Alice Kinfj ; Klamath River, Siskiyou Co., Butler 193; 

 Honey Lake Valley, Davy 3321. 



Refs. — Poi,Y<;oNUM MUHLENBERGII Wats. Proc. Am. .\cad. 14: 295 (1879), tvpc from U. S. ; 

 Jepson, Fl. W. Mid. C^al. 101 (1901). P. emer.sum Britt. Trans. N. Y. Acad. Sei. 8: 73 (18S9) ; 

 Small, Monog. N. Am. Polygonum, 44, pi. 9 (1895). Pernicaria franciseana Greene, Leaflets, 

 1: 42 (1904), type loc. Mountain T^ake, S. F. P. hexperia Greene, 1. c. 43, type loc. Searsville, 

 San Mateo Co., C. V. Baker 1835. 7'. alixmaefolia Greene, 1. c. 44, type loc. Cloverdale, Heller 

 5823. /'. cniillri (Ireene, 1. c, ty])e loc. Visalia, Covillc t}'- Funston 1200. 



(), P. lapathifolium L. Common Knotweed. Willow-weed. Annual, com- 

 monly stout. 1 to 4 feet high, branching; herbage glabrous except a very 



