. The Canadian field-naturalist. Listera australis. Southern Twayblade (Figure 2A) Known from Kent County only: Kouchibouguac National Park, along the periphery of Kelly's Bog, D. M. Wood, 27 June 1977 (DAO) (Figure 2B). New to New Brunswick. This is an eastern North American species which is found from eastern Texas and Florida north to New Brunswick, Cape Breton Island, Nova Scotia (Whiting 1971), New Brunswick, southern Quebec (Greenwood 1962; Mousley 1940), and south- ern Ontario (Whiting and Bobbette 1974). A map of the known Canadian distribution was given by Whit- ing and Bobbette (1974
. The Canadian field-naturalist. Listera australis. Southern Twayblade (Figure 2A) Known from Kent County only: Kouchibouguac National Park, along the periphery of Kelly's Bog, D. M. Wood, 27 June 1977 (DAO) (Figure 2B). New to New Brunswick. This is an eastern North American species which is found from eastern Texas and Florida north to New Brunswick, Cape Breton Island, Nova Scotia (Whiting 1971), New Brunswick, southern Quebec (Greenwood 1962; Mousley 1940), and south- ern Ontario (Whiting and Bobbette 1974). A map of the known Canadian distribution was given by Whit- ing and Bobbette (1974). The species is very rare in New Brunswick where at its only known locality it grows in flat moist sphagnum with Three-leaved False Soloman's Seal {Smilacina trifolia) and stunted Black Spruce (Picea mariana) at the edge of a bog. Listera convallarioides. Broad-leaved Twayblade (Figure 3A) Known from Gloucester, Kent, Madawaska, Resti- gouche, St. John, Victoria, and York counties (Figure. Figure 2A, Listera australis. 2B, Distribution of Listera australis in New Brunswick. 3B). This is a boreal North American species which is found across Canada from Newfoundland to British Columbia, thence southward in New England and in the west at higher elevations to Arizona (Luer 1975). Widespread over the province, but nowhere common. At Kouchibouguac National Park this species was found in wet usually organic soils under the medium shade of White Cedar (Thuja occidentalis); elsewhere in the province it occurs in a variety of habitats: damp sphagnum at the edge of cedar bogs, conifer woods, hardwood and softwood floodplains and bottomland, and damp mossy woods. Listera cordata. Heart-leaved Twayblade (Figure 4A) Known from Carleton, Charlotte, Gloucester, Kent, Madawaska, Northumberland, Restigouche, Victoria, Westmorland, and York counties (Figure 4B). This is a circumboreal species which in North America is found across Canada from Newfoundland and Labrador to British Columbia, south
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