Floral morphology suggests this species is predominantly outcrossing, but surveys of allozyme diversity suggest high, variable levels of inbreeding in populations (FIS 520.078 to 1.0). It emerges in May and blooms in June or in July further north. Platanthera leucophaea has the largest flowers and nectar spurs of eastern North American Platanthera, and its large floral dis play and lack of vegetative reproduction indicate a strong in vestment toward pollination and seed production (Bowles 1983, Usually occurs in wetlands, but occasionally in non-wetlands. Most populations are small with the current number of flowering plants documented totalling just over 1000. The flowers are fragrant at night and are pollinated by large sphinx moths. The western prairie fringed orchid's flowers are somewhat larger than those of the closely related eastern Following periods of apparent absence lasting several years, the orchid is known to produce dramatic, mass flowerings. Platanthera means “flat anthers,” referring to the broad male reproductive parts of the flower. Platanthera leucophaea, commonly called Eastern Prairie Fringed Orchid, is primarily distributed in the mid-western United States and Canada, from Oklahoma to Ontario, with a limited distribution in the northern mid-Atlantic and New England regions. Fens 1994. state. Fish and Wildlife Service. The population at site 31, once numbering between 1000-1500, is currently nearly extirpated with only a few plants counted in 2000. It is considered extirpated in Indiana, New Jersey, and Pennsylvania, and is known only from historical records in New York and South Dakota. 39 pp. Platanthera leucophaea, commonly known as the prairie white fringed orchid or eastern prairie fringed orchid, is a rare species of orchid native to North America.

Barrington, Illinois. or respective copyright holders. supplement. Please visit our sponsors. Seeds of Platanthera leucophaea germinated within ca 20 mo of sowing at both Weston Cemetery and Hildy Prairie. A member of the Orchid family (Orchidaceae) and prairie rarity is the Eastern Prairie Fringed Orchid (Platanthera leucophaea). First Edition. Not all populations have been surveyed recently for changes in size. Seeds must first form an association with a soil fungus that forms mycorrhizae before they can germinate and develop into seedlings.

Species designated at meetings of the full committee are added to the list.The Canadian Wildlife Service, Environment Canada, provides full administrative and financial support to the COSEWIC Secretariat. Platanthera leucophaea.

The tallgrass prairie orchids Platanthera leucophaea (Nutt.)

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populations both exist in a county, only native status The species once occurred widely in the northeastern United States, particularly in the southern Great Lakes region and extended northward into southern Ontario. The committee meets to consider status reports on candidate species.The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) was created in 1977 as a result of a recommendation at the Federal-Provincial Wildlife Conference held in 1976. Eastern Prairie Fringed Orchid ( Platanthera leucophaea) Fact Sheet . DESCRIPTION: Plant glabrous, arising from a cluster of fleshy, thickened roots, 20-90 cm tall. Distribution. The soil should be high in organic matter, preferably with a little sand, and the pH should be mildly acid to neutral. (Wetland indicator code: The Eastern Prairie Fringed-orchid (Platanthera leucophaea) is a tall orchid with alternate lanceolate leaves and a spike of 10-40 creamy-white flowers, each with a prominent fringed petal and a long spur. Of the 20 seed packets sown at Hildy Prairie in November, 2000, one packet on a single line (scarified seed from Lyons Woods, Lake Co., IL) harbored nine Stage 4 protocorms. FACW)