356 
Var. LEPTOSTACHYUM (Meisn.). 
P. acre, H.B.K., var. leptostachyum, Meisn. in D.C. Prodr. 
xiv. 108 (1856). 
Vermont: Clarendon (Brainerd); New Jersey: Cedar Swamp 
(Torrey); Pennsylvania: Easton (Porter); Perry Co. (Small); 
Virginia: Cumberland Gap (Small); Florida (Riehl, 311); Mis- 
souri: St. Louis (Engelmann); California: at the Geysers (Tor- 
rey); New Granada: La Paila (Holton, 274). 
17, POLYGONUM ACUMINATUM, H.B.K., Nov. Gen. ii. 178 (1817). 
P. cuspidatum, Willd., ex. Spreng. Syst. ii. 256 (1825). 
P. erectum, Vell. Fl. Flum. iv. t. 42 ? (1827). 
P. acuminatum, H.B.K., var. Humboldtii, Meisn. in FI. 
Bras. v. 14, t. 4. £1. (1855). 
West Indies: Cuba (Wright, 2,245); Porto Rico (Sintenis, 1715 
and Eggers); Guatemala (Bernoulli, 1065); Surinam (Hostman, 
473); Brazil: Minas Geraes (Regnell, 234). 
Var. BRACHYSTEMON, Meisn. in D.C. Prodr. xiv. 114 (1856). 
Brazil: Pernambuco (Gardner, 1123); Surinam (Hostmann 
and Keppler, 473). 
Var. MICROSTEMON, Meisn. in Mart. Fl. Bras. v. 14, t. 4, f. 2 
(2855). 
Brazil: Bahia (Martius); Paraguay: Pilcomayo River (Mo- 
rong, 1060). 
Var. WEDDELLI, Meisn. in D.C. Prodr. xiv. 114 (1856). 
Southern Brazil, according to Meisner. Guatemala: Coban, 
4.300 feet (Tuerkcheim, 517). 
18, POLYGONUM HISPIDUM, H.B.K. Nov. Gen. ii. 178 (1817). 
Cuba (Wright, 3669); New Granada: La Paila (Holton, 
273); Brazil: Pernambuco (Gardner, 1122); Paraguay: Pilco- 
mayo River (Morong, 1026). : 
2. Ocree eciliate or sometimes slightly ciliolate, 
19. POLYGONUM PENNSYLVANICUM, L., Sp. Pl. 362 (1753). 
Canada to Florida, westward to Minnesota and Texas. 
20. POLYGONUM MEXICANUM, n. sp. 
P. Pennsylvanicum, S. Watson,in Proc. Am. Acad. Arts and 
Sci. xviii, 147 (1883). 
Plant erect, branched, apparently three to four feet high, 
smooth except the peduncles and pedicels, which are glandular; 
