. The Canadian field-naturalist. 1991 Austen: Status of False Rue-anemone 513. Figure 1. Flower and foliage of False Rue-anemone (Isopyrum biternatum). Erindale College (TRTE); and the University of Western Ontario (UWO). No recent records of Isopyrum biternatum have been reported in Norfolk County, suggesting that /. biternatum has been extir- pated in its historical location near Lynn Valley east of Simcoe (Soper 1962). Isopyrum biternatum was not found during field investigations conducted near Parkhill (Middlesex County), Ontario in May 1989. A more intensive search effort in the Parkhill
. The Canadian field-naturalist. 1991 Austen: Status of False Rue-anemone 513. Figure 1. Flower and foliage of False Rue-anemone (Isopyrum biternatum). Erindale College (TRTE); and the University of Western Ontario (UWO). No recent records of Isopyrum biternatum have been reported in Norfolk County, suggesting that /. biternatum has been extir- pated in its historical location near Lynn Valley east of Simcoe (Soper 1962). Isopyrum biternatum was not found during field investigations conducted near Parkhill (Middlesex County), Ontario in May 1989. A more intensive search effort in the Parkhill area may reveal a remnant population of Isopyrum biternatum in suitable habitat along Mud Creek. Habitat Throughout its range, Isopyrum biternatum grows in shaded woods and thickets, often on rich, wooded slopes in floodplain zones. This species is often found in close proximity to streams; Melampy and Hayworth (1980) found, respectively, 50% and 74% of 147 /. biternatum clumps within 10 and 25 m of streams in Illinois. Populations of Isopyrum biternatum are restricted in Canada to the Carolinian Floral Region (Scoggan 1978). In Ontario, the species occurs in areas domi- nated by gray brown luvisolic soils which are rich in calcareous till and lacustrine deposits from limestone and dolostone (Hoffman 1989). Isopyrum biternatum is generally found in shady areas within mature maple-beech forests on gradual slopes; it is not found on steep slopes or in open, highly disturbed sites. Populations in Ontario were generally found in mixed hardwood Carolinean Forests, dominated by Sugar Maple (Acer saccharum Marsh.), in combina- tion with other species including, Hop-hornbeam (Ostrya virginiana (Mill.) K. Koch), Blue-beech (Carpinus caroliniana Walt.), American Beech (Fagus grandifolia Ehrh.), Bitternut Hickory (Carya cordiformis (Wang.) K. Koch), Shagbark Hickory (C. ovata (Mill.) K. Koch), American Basswood (Tilia americana L.), Butternut (Juglans cinerea L.) and White Ash (Fraxinus a
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