1922] Fernald,— Notes on the Flora of Nova Scotia 173 



stations it occurs with B. caerulea-grandis and B. populifolia. In 

 foliage B. caervlea is ;i good combination of the two; in fruiting aments 

 it is 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. 

 cin riilru is a hybrid of B. caerulea-grandis and li. populifolia and it is 

 noteworthy that on one of his sheets of B. caeruleaia the Gray Herbar- 

 ium Blanchard originally wrote: "It may be a hybrid between 

 in ndula [of eastern America, i. e. B. caerulea-grandis] and populifolia. " 



Alnus encana (L.) Moench, var. hypochlora Call. Recorded from 

 a single station in Rhodora, 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 (). borealis (Q. 

 rubra, var. ambigua), the southern extreme with flattish cups was 

 twice collected. Yarmouth Co.: dry woods near Canoe Lake. 

 Annapolis Co.: woods bordering Boot Lake. 



**Polygonum Bistorta L. Sp. PI. i. 300 (1753). The European 

 Bistort is somewhat naturalized (at least two obviously increasing 

 clumps) in a field in Victoria Park, Truro. 



P. Muhlenbergii (Meisn.) Watson. Additional stations are, in 

 Yarmouth Co.: cobbly beach of Ogden Lake; rocky swale bordering 

 Dominiek Lake east of Springhaven. 



*P. pensylvanicum L., var. genuinum Fernald, Rhodora, xix. 

 72 (1917). Annapolis Co.: exsiccated clay roadway bordering salt 

 marsh, Annapolis Royal; first record from east of Massachusetts, 

 previous records belonging to var. laevigatum Fernald. 



P. robustius (Small) Fernald, Rhodora, xxiii. 147 (1921). Addi- 

 tional stations, in Yarmouth Co.: cobbly beach of Ogden Lake. 

 Digby 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. hydropiperoidks, var. digitatum Fernald, Rhodora, xxiii. 

 2G0 (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 



