70 



1878. P. lapathifolium, L. (Dock leaved Persicaria.) 

 P. nodosum, Pers. Macoun, Cat. Ill, 409. 



Low ground. Aug. 1. Sheaths and bracts not ciliate. Spikes 

 short, erect or nearly so. Peduncles with scattered sessile glands. 



1879. var. incarnatum, Watson. 



P. incarnatum, Ell. Macoun, Cat. Ill, 409. 



Low, rich ground. Not uncommon. Aug. 1. A tall, coarse 

 plant sometimes four feet high, with long leaves and nodding, 

 slender, spikes of pale pink flowers. 

 1880. P. Pennsylvanicum, L. 



Low, rich ground. Common. Aug. 1. (B) A. tall handsome 

 species with conspicuous flowers. Easily recognisable by the 

 stalked glands on the peduncles. 

 1882. P. amphibium, L. (Water Persicaria.) 



In shallow water. Common. Aug. 1. (B) Flower spike 

 erect, terminal, borne above the water from the centre of two or 

 three floating leaves. 



1884. P. Hartwrightii, Gr. 



P. amphibium, L. var terrestre, Auct. 



In ditches and at the sides of streams and ponds. Not uncommon. 

 Aug. 1. This species has been, until lately, confounded with 

 P. amphibium and P. Muhlenberg ii, Watson. It differs from 

 the former in its habit of growth and the nature of the inflores 

 cence. In this species and P. Muhlenbergii the flowers are borne 

 in a slender elongated spike. P. Hartiorightii has foliaceouB 

 and ciliate sheaths. These characters are lacking in P. Muhlen- 

 bergii, which, however, is rough, with appressed hairs all over. 



1885. P. Persicaria, L. (Lady's Thumb.) 



In cultivated and waste ground. Common. July 2. (B) 

 Leaves usually blotched, sheaths fringed, peduncles without 

 glands, spikes short and thick. 



1886. P. Hydropiper, L. (Common Smartweed.) 



Low ground. Annual. Aug. 2. (B) Whole plant smooth. 

 Flowers greenish, tipped with pink, spikes nodding. 



1887. P. acrk, H B K. (Water Smartweed.) 



Low ground. Rare. Billings Bridge. Aug. 1. Perennial. 



