1922] Fernald,—Notes on the Flora of Nova Scotia 173 
stations it occurs with B. caerulea-grandis and B. populifolia. In 
foliage B. caerulea 1s a good combination of the two; in fruiting aments 
itis much closer to B. populifolia, having short horizontally divergent 
and puberulent scales, and in a large proportion of specimens there 
is only a solitary staminate ament, B. caerulea-grandis more often 
having 2 or 3. The present evidence seems to indicate that B. 
caerulea is a hybrid of B. caerulea-grandis and B. populifolia and it is 
noteworthy that on one of his sheets of B. caeruleain the Gray Herbar- 
ium Blanchard originally wrote: “It may be a hybrid between 
pendula [of eastern America, i. e. B. caerulea-grandis] and populifolia.” 
ALNUS INCANA (L.) Moench, var. HyPocHLORA Call. Recorded from 
a single station in Ruopora, xxiii. 257 (1922). Frequent eastward at 
least to Lunenburg Co. 
QUERCUS BOREALIS Michx. f., var. MAXIMA (Marsh.) Ashe, Proc. 
Soc. Am. Foresters, xi. 90 (1916). Q. rubra of authors, not L. Al- 
though the common oak of Nova Scotia is typical Q. borealis (Q. 
rubra, var. ambigua), the southern extreme with flattish cups was 
twice collected. YarmMourH Co.: dry woods near Canoe Lake. 
ANNAPOLIS Co.: woods bordering Boot Lake. 
** Polygonum Bistorta L. Sp. Pl. i. 360 (1753). The European 
Bistort is somewhat naturalized (at least two obviously increasing 
clumps) in a field in Victoria Park, Truro. 
P. MvnrENBERGII (Meisn.) Watson. Additional stations are, in | 
YaAnMovTH Co.: cobbly beach of Ogden Lake; rocky swale bordering 
Dominick Lake east of Springhaven. 
*P. PENSYLVANICUM L., var. GENUINUM Fernald, RHODORA, xix. 
72 (1917). AnNnapouis Co.: exsiccated clay roadway bordering salt 
marsh, Annapolis Royal; first record from east of Massachusetts, 
previous records belonging to var. LAEVIGATUM Fernald. 
P. noBvsTIUS (Small) Fernald, Ruopora, xxiii. 147 (1921). Addi- 
tional stations, in YAnMovTH Co.: cobbly beach of Ogden Lake. 
Diesy Co.: rocky thicket bordering West Branch of Tusket R., 
Havelock; rocky thicket bordering Wentworth Lake. ANNAPOLIS 
Co.: in peat and granite gravel bordering outlet of Lamb’s Lake. 
**P. PURITANORUM Fernald, RHODORA, xxi. 141 (1919). ANNAPOLIS 
Co.: in sand or gravel among granite boulders, beach of Grand Lake; 
first record outside southeastern Massachusetts. 
P. HYDROPIPEROIDES Michx. Common eastward at least to Anna- 
polis and Lunenburg Cos. 
P. HYDROPIPEROIDES, var. DIGITATUM Fernald, RHODORA, xxiii. 
260 (1922). Typical P. hydropiperoides was in maturity from mid- 
July through August, but the original colony of var. digitatum, when 
visited on August 23, barely showed color in the inflorescences: 
the original collection was made (in good flower) in October, 1920. 
**P. hydropiperoides x robustius, n. hybr., caule decumbente 
