196 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Sheaths with marginal bristles. 
Racemes oblong or cylindric, densely flowered; perianth 
not punctate, usually pink or rose-colored... .... 5. P. persicaria. 
Racemes slender, loosely flowered; perianth white or 
green, copiously punctate......-.-...-...-....-.. 6. P. punctata. 
Doctor Small reports Persicaria persicarioides (L.) Small from New Mexico. The 
species is much like P. persicaria, but is slightly larger throughout and perennial, 
while the latter is annual. 
1. Persicaria amphibia (L.) 8. F. Gray, Nat. Arr. Brit. Pl. 2: 268. 1821. 
Polygonum amphibium L. Sp. Pl. 361. 1753. 
Polygonum coccineum Muhl, Cat. Pl. 40. 1813. 
Type Locauity: ‘‘Habitat in Europa.”’ 
Rance: British America to California, New Mexico, and New Jersey; also in 
Europe and Asia. 
New Mexico: Tunitcha Mountains; Dulce Lake. Floating in water, in the Tran- 
sition Zone. 
2. Persicaria muhlenbergii (Meisn.) Small; Rydb. Colo. Agr. Exp. Sta. Bull. 100: 
111. 1906. 
Polygonum amphibium muhlenbergii Meisn. in DC. Prodr. 14: 116. 1856. 
Polygonum muhlenbergit 8. Wats. Proc. Amer. Acad. 14: 245. 1879. 
Persicaria rothrockit Greene, Leaflets 1: 45. 1904. 
Type Locauity: North America. 
Rance: Throughout North America from the Arctic regions to central Mexico. 
New Mexico: Mesilla Valley. Wet ground, in the Lower Sonoran Zone. 
3. Persicaria lapathifolia (L.) S. F. Gray, Nat. Arr. Brit. Pl. 2: 270. 1821. 
Polygonum lapathifolium L. Sp. Pl. 360. 1753. 
Type Locauity: “‘ Habitat in Gallia.”’ 
Rance: Throughout most of North America and in Europe; with us possibly 
introduced, but now widely distributed. 
New Mexico: Common throughout the State. Low, wet ground in the Lower 
and Upper Sonoran zones. 
One of the commonest weeds in cultivated fields. It is most abundant in the Rio 
Grande Valley, especially where the ditch water overflows. 
4. Persicaria longistyla Small, Fl. Southeast. U.S. 377. 1903. 
Polygonum longistylum Small, Bull. Torrey Club 21: 169. 1894. 
TYPE LocaLity: New Mexico. 
RanGE: Missouri and Louisiana to New Mexico. 
New Mexico: Pitt Lake; north of Melrose. Wet ground. 
The type is Fendler’s 749, collected probably somewhere about Santa Fe. 
5. Persicaria persicaria (L.) Small, Fl. Southeast. U. 8. 378. 1903. 
Polygonum persicaria L. Sp. Pl. 361. 1753. 
Type Locauity: “ Habitat in Europae cultis.’’ 
RanGE: British America to California and Florida, south into Mexico; also in the 
Old World. 
New Mexico: Farmington; Santa Fe} Indian Creek; Pajarito Park; Gallinas Can- 
yon; Gila Hot Springs; Pecos; Sandia Mountains. Waste and wet ground. 
6. Persicaria punctata (Ell.) Small, Fl. Southeast. U. S. 379. 1903. 
Polygonum punctatum Ell. Bot. 8. C. & Ga. 1: 445. 1817. 
Type Loca.ity: South Carolina and Georgia. 
Ran@eE: British America to California, southward into South America and the 
West Indies. 
New Mexico: Mesilla Valley; Mimbres River; Cloverdale. Wet ground, 
