north american native orchid journal - at The Culture Sheet

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Brown & Folsom: WILD ORCHIDS OF THE WHITE MOUNTAINS OF NEW HAMPSHIRE AND MAINE Platanthera dilatata (Pursh) Lindley tall white northern bog orchis Range: Alaska east to Newfoundland, south to California and New Mexico; Minnesota south to Indiana, Pennsylvania, and New England In the White Mountains region: widespread throughout the region with few large colonies Plant: terrestrial, 25 to over 100 cm tall Leaves: 4-12; cauline, passing into bracts on the stem, lanceolate 4-7 cm wide × 15-30 cm long Flowers: 20-100+; arranged in a dense terminal spike; dorsal sepal ovate, lateral sepals linear; petals linear-falcate, enclosed within the sepals forming a hood; lip linear-lanceolate, dilated at the base; perianth pure white; individual flower size 1.75-2.0 cm, not including the cylindric spur which is about equal to the length of the lip Habitat: open wet meadows, roadside ditches and seeps, fens, and bogs Flowering period: late June to August Platanthera dilatata is the showiest of the slender bog or rein orchids. Its tall white, fragrant spikes may occur in great numbers throughout the range of the species. Size is variable and smaller plants often only have a few flowers. Mixed colonies of P. dilatata, P. huronensis and/or P. aquilonis are not uncommon. Platanthera dilatata is by far the more frequently seen of the three. Hybridization among these species is minimal today because of the evolution of self-pollinating breeding systems in the green-flowered species. Plants known as P. ×media where once thought to represent frequent hybrids between P. dilatata and P. (hyperborea) aquilonis, and although that is technically correct, they actually represent plants of P. huronensis. 236
Brown & Folsom: WILD ORCHIDS OF THE WHITE MOUNTAINS OF NEW HAMPSHIRE AND MAINE 237
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