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 ainpliibia (L.) S. F. Gray, Nat. Arr. Brit. PI. 2: 268. 1821. 

 Polygonum amphibium L. Sp. PI. 361. 1753. 



Polygonum coccineum Muhl. Cat. PI. 40. 1813. 



Type locality: "Habitat in Europa." 



Range: 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 (Meisu.) Small; Rydb. Colo. Agr. Exp. Sta. Bull. 100: 



111. 1906. 

 Polygonum amphihium muhlenbergii Mexsn. in DC. Prodr. 14: 116. 18.56. 

 Polygonum muhlenbergii S. Wats. Proc. Amer. Acad. 14: 245. 1879. 

 Persicaria rothrochii Greene, Leaflets 1: 45. 1904. 

 Type locality: North America. 



Range: 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 lapafJiifolium L. Sp. PI. 360. 1753. 



Type locality: "Habitat in Gallia." 



Range: 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 iu 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 giound. 



The type is Fendler's 749, collected probablj' somewhere about Santa Fe. 



5. Persicaria persicaria (L.) Small, Fl. Southeast. U. S. 378. 1903. 

 Polygonum persicaria L. Sp. PI. 361. 1753. 



Type locality: "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. S. C. & Ga. 1: 445. 1817. 



Type locality: South Carolina and Georgia. 



Range: British America to Califox-nia, southward into South America and the 

 West Indies. 

 New Mexico: Mesilla Valley; Mimbres River; Cloverdale. Wet ground. 



