1902] Robinson, — Polygonums of Section Avicularia 71 



** *■*■ Flowers larger ; sepals 2 to 3 mm. long ; the pedicels exserted ; foliage 



yellowish green. 



= Leaves elliptical, large for this section of the genus. 



P. erectum, L. Erect or decumbent, bright yellowish green, 1 to 

 6 dm. high ; stems rather stout, much branched : leaves elliptical to 

 obovate, 2 to 4 cm. long, 5 to 15 mm. broad: flowers yellowish 

 green: achene often slightly exserted. — Spec. PL i. 363 (1753); 

 Wats. & Coult. in Gray, Man. ed. 6, 440 ; Small, Monog. Gen. 

 Polyg. no, t. 42. P. avicularc, var. erectum, Am. auth., not Ledeb. 

 P. ramosissimum, Meisn. in DC. Prodr. xiv. 97, not Michx. — Dry 

 sunny rich soil, roadsides and especially on rubbish heaps, local. 

 Maine, Mechanic Falls, in streets, 19 Sept. 1897,/. A. Allen. Ver- 

 mont, Pownal, 8-11 Sept. 1899, IV. IV. Eggleston. Massachusetts : 

 South Boston, waste ground, 25 Sept. 1878, H. A. Young; Tewks- 

 bury, 24 Sept. 1899, E. F. Williams; Cambridge, 30 Sept. 1884, 

 W. Deane, 28 Aug. 1897, IV. P. Rich, E. F. Williams; Watertown, 

 12 Sept. 1879, C. E. Perkins; Williamstown, 5 Sept. 1897, /. R. 

 Churchill. Rhode Island : East Providence, 26 Aug. 1878, IV. W. 

 Bailey; Providence, Cat Swamp, 2 Sept. 1894 and 15 July, 1898, 

 J. F. Collins; Newport, on sandy roadside, 21 Sept. 190 1, IV. P. 

 Rich. Connecticut: Fairfield, 27 Aug. 1892, and 3 Sept. 1901, 

 E. H. Fames; Bridgeport, in sandy soil, 7 Sept. 1895, E. H. Fames; 

 Southington, waste ground, 1 Sept. 1897, C. If. Bissell; Rocky Hill, 

 roadside in rich soil, 3 Sept. 1901, C. H. Bissell, no. 5458. Plate 

 35' FIG. 9. 



= = Leaves lanceolate, narrowed at both ends. 



P. ramosissimum, Michx. Erect, tall, paniculately branched, 3 to 

 10 dm. high, yellowish green : stem leaves lanceolate, mostly acute, 

 3 to 5 cm. long, 5 to 8 mm. broad ; the rameal considerably smaller ; 

 flowers 3 to 4 mm. long, yellowish green, not at all rubescent, borne 

 on slender mostly exserted pedicels : sepals 6, the 3 outer sharply 

 carinate, somewhat cucullate, green with yellow margins, the 3 inner 

 smaller, thinner, yellow or yellowish white : achene included. — 

 Fl. i. 237 (1803); Wats. & Coult. in Gray, Man. ed. 6, 440, as to 

 char, and western part of range; Small, Monog. Gen. Polyg. 114 in 

 part, t. 44 (where the figure of the calyx shows but five lobes and 

 fails to bring out their characteristic inequality). — Massachusetts, 

 Truro, sandy bank on border of salt marsh, 30 Aug. 1899, IV. P. 

 Rich. Pennsylvania, Allegheny County, Zeigler. Illinois: Ring- 

 wood, Vasey; Fountaindale and Ogle County, Bebb; Bloomington, 

 Robinson. Iowa : Guthrie, J. A. Allen ; Ames, Pammel &• Combs, 

 no. 201. Wisconsin, Prairie du Chien, T. J. Hale. Missouri, 

 Atchison County, Bush, no. 329. Oklahoma, Huntsville, L. A. 

 Blankinship (distributed as P. camporum). Kansas, Reno County, 



