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 Hybrids: Spiranthes ×borealis P.M. Brown northern hybrid ladies’-tresses (S. casei var. casei × S. ochroleuca) Known primarily from northern New England there are few places where both parents are found within the range of this work. It appears as a small flowered S. ochroleuca or a largeflowered S. casei and may be either single or multiple ranked. Spiranthes ×simpsonii Catling & Sheviak Simpson’s hybrid ladies’-tresses (S. lacera var. lacera × S. romanzoffiana) Although the two parents often grow in proximity the hybrid is known from only a few collections and perhaps has been overlooked in the past. 260
Brown & Folsom: WILD ORCHIDS OF THE WHITE MOUNTAINS OF NEW HAMPSHIRE AND MAINE TRIPHORA consists of about 20 species in North America, the West Indies, Mexico, and Central America, and is a genus of small, delicate herbs, many of which may be largely mycotrophic. They all arise from swollen tuberoids and produce, in some, very colorful, although small, flowers. Several species have flowers that do not fully open. Triphora trianthophoros (Swartz) Rydberg three birds orchid forma albidoflava Keenan–white-flowered form Range: Texas north to Minnesota east to Maine south to Florida In the White Mountains region: locally abundant at the northern limit of its range in Carroll County, NH Plant: terrestrial, 8-25 cm tall Leaves: 2-8; broadly ovate-cordate, with smooth margins, dark green often with a purple cast; 10-15 × 2-15 mm Flowers: 1-8 (12), nodding; from the axils of the upper leaves; sepals and petals similar, oblanceolate; perianth white to pink; lip 3-lobed, the central lobe with the margin sinuate and 3 parallel green crests or, in the forma albidoflava, the perianth pure white and the crests yellow; individual flower size ca. 1-2 cm Habitat: deciduous and mixed woodlands, usually with American beech and Canadian hemlock Flowering period: late July-mid September Three birds orchid is the largest-flowered and showiest of the genus Triphora. The plants are quite elusive and only appear for a few days most years. The stunning little flowers open in midmorning and usually close by mid-afternoon, leaving only a few hours for the eager eye to observe them. Colonies are not at all consistent in the flowering habits from year to year and it often takes a great deal of persistence on the part of the observer to catch them in prime condition. forma albidoflava 261
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