1917] St. John,— Arenaria lateriflora and its Varieties 259 
than the subtending leaves. In this peculiar habit and in the foliage 
the plants are well characterized and it seems wisest to give them a 
varietal designation, although it is freely admitted that at present 
we do not know of transitional colonies. The two plants of Pocoto- 
paug Lake may, then, be called 
BIDENS HETERODOXA (Fernald) Fernald & St. John, var. monardae- 
folia, n. var., planta racemose ramosa, ramis brevibus axillaribus; 
foliis simplicibus vel 3-partitis longe petiolatis, laminis vel lobis 
terminalibus oblongo-lanceolatis vel lanceolato-ovatis grosse dentatis; 
aristis acheniorum retrorse setosis. 
Plant racemosely branched; branches short, axillary: leaves simple 
or 3-parted, long-petioled; the blades or terminal lobes oblong- 
lanceolate or lance-ovate, coarsely dentate: awns of the achenes re- 
trorsely setose.— CONNECTICUT: strand of Lake Pocotopaug, Chat- 
ham, September 21, 1910 and September 21, 1915, R. W. Woodward 
(TYPE in Gray Herb.). 
B. HETERODOXA, var. agnostica, n. var., habitu foliisque ut apud 
var. monardaefoliam; aristis acheniorum laevibus vel obsolete scabris. 
Habit and foliage as in var. monardaefolia: awns of the achenes 
smooth or obscurely scabrous.— ConNEcTICUT: strand of Pocoto- 
paug Lake, Chatham, September 21, 1910, R. W. Woodward and C. H. 
Bissell (ryPE in Gray Herb.); September 21, 1915, R. W. Woodward. 
Gray HERBARIUM. 
ARENARIA LATERIFLORA AND ITS VARIETIES IN 
NORTH AMERICA. 
Harop Sr. JOHN. 
In 1862 Regel, after studying Eurasian and Alaskan specimens, 
described a series of varieties of Möhringia lateriflora (L.) Fenzl, 
using as diagnostic characters the shape and the pubescence of the 
leaves. The occurrence of one of these varieties in a collection of 
plants recently made in northern Manitoba by Mr. J. H. Emerton has. 
involved the writer in a study of the Eurasian and North American 
material of this species and has led him to the belief that the seemingly 
artificial characters used by Regel do really define recognizable catego- 
ries whose distributions are similar to those of many other boreal types. 
