. The Canadian field-naturalist. Natural history. 88 The Canadian Field-Naturalist Vol. 111 Liparis loeselii (Linnaeus) L. C. M. Richard Loesel's Twayblade Liparis de Loesel In recent times L. loeselii has been widespread in many habitats, especially in wetlands and on moist sands. It shows considerable variation of stature according to its habitat. It can be recognized by its two basal, erect or arching, elliptical to lanceolate leaves and its several greyish green or greenish yellow flowers. Description Height: 4 (8 - 17) 29 cm [219 plants] (see Morphological Variation below regarding variat
. The Canadian field-naturalist. Natural history. 88 The Canadian Field-Naturalist Vol. 111 Liparis loeselii (Linnaeus) L. C. M. Richard Loesel's Twayblade Liparis de Loesel In recent times L. loeselii has been widespread in many habitats, especially in wetlands and on moist sands. It shows considerable variation of stature according to its habitat. It can be recognized by its two basal, erect or arching, elliptical to lanceolate leaves and its several greyish green or greenish yellow flowers. Description Height: 4 (8 - 17) 29 cm [219 plants] (see Morphological Variation below regarding variation with habitat). Flowers: 1 (3 - 10) 24 [164 plants]; greyish green in shady habitats to greenish yellow in sunny habi- tats; no odour detected. Leaves: 2, rarely 3 [DAO 691473]; 2 on non- flowering plants; greyish green, usually long and arching in shade; yellowish green, short and erect in sun. Overwintering State: as the corm of the current year. Capsules: pale yellow to yellowish white, obovoid, typically x cm, erect or nearly so; yield usually greater than 40%, averaging 70% [89 plants]. Seeds: brownish orange, released in late September to late October. Blooming Period: 9 June (18 June - 10 July) 2 August [72 records]. Colony Sizes: 1 - 430, typically to 150, flowering and non-flowering plants [112 colonies], as scattered individuals and sometimes in small clumps. Distribution: The Ottawa District is at the northern edge of the range of this eastern species. It occurs predominantly in the Mixed Forest Region. Within the District, this orchid is thinly scattered on the Shield but is rather more common on the Lowlands, especially in areas of sandstone and of sand deposit- ed by the Champlain Sea and subsequent rivers. Habitats: Liparis loeselii grows in many mesic to wet-mesic, semi-shaded to open habitats over a vari- ety of bedrock types. Relatively natural habitats include willow swales, alder thickets, coniferous and deciduous swamps,. 76° 30 Liparis loeselii
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