. Atlas of the rare vascular plants of Ontario. Rare plants; Botany. HABITAT: Dry. grassy openings in rich hardwoods and grassy woodland edges. STATUS: Rare in Canada. Possibly extirpated in New York; threatened in Ohio; rare in New Hampshire and Vermont. NOTES: Carex retroflexa is similar to two common woodland sedges, C. radiata (Wahlenb.) Small (=C. rosea sensu Mackenzie) and C. rosea Schkuhr ex Willd. (=C. convoluta Mackenzie). Carex retroflexa may be distinguished from these two taxa by its smooth perigynium beak and spongy, distended, often dark-coloured perigynium base. Previous reports
. Atlas of the rare vascular plants of Ontario. Rare plants; Botany. HABITAT: Dry. grassy openings in rich hardwoods and grassy woodland edges. STATUS: Rare in Canada. Possibly extirpated in New York; threatened in Ohio; rare in New Hampshire and Vermont. NOTES: Carex retroflexa is similar to two common woodland sedges, C. radiata (Wahlenb.) Small (=C. rosea sensu Mackenzie) and C. rosea Schkuhr ex Willd. (=C. convoluta Mackenzie). Carex retroflexa may be distinguished from these two taxa by its smooth perigynium beak and spongy, distended, often dark-coloured perigynium base. Previous reports of this species from Ontario were based on misidentifications. HABITAT: Clairières arides et herbues des forêts riches et lisières herbues des boisés. SITUATION: Rare au Canada. Peut-être déracinée dans l'État de New York; menacée en Ohio; rare au New Hampshire et au Vermont. REMARQUES: Carex retroflexa ressemble aux deux espèces communes de carex des bois, C. radiata (Wahlenb.) Small (=C. rosea sensu Mackenzie) et C. rosea Schkurh ex Willd. (=C. convoluta Mackenzie). Toutefois, on peut l'en différencier par le bec lisse et la base spongieuse, distendue et souvent foncée du périgyne. Les observations antérieures de l'espèce en Ontario résultent d'une erreur d'identification. REFERENCES / SOURCES Evans, 1976. Taxonomy of the Carex rosea —C. retroflexa complex in Illinois (section Bracteosae: Cyperaceae). Ph. D. thesis. Southern Illinois University, Carbondale. 127 pp. Unpublished/inédit. Oldham & Reznicek 1987 ê. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Argus, George W. (George William); National Museum of Natural Sciences (Canada). Botany Division. Ottawa : Botany Division, National Museum of Natural Sciences = Division de la botanique, Musée national des scien
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbotany
