. The Canadian field-naturalist. 618 The Canadian Field-Naturalist Vol. 110. Figure 3. Swollen base of an Ontario Pumpkin Ash. Figure 5. A Pumpkin Ash tree growing in an oxbow pond along the Canard River, Essex County, Ontario. B 5cm. Figure 4. Fruits (samaras) of three ash species: (A) Pumpkin Ash, F. profunda; (B) Red Ash, F. penn- sylvanica; (C) White Ash, F. americana. Ontario material). The relative size of the samara is shown in Figure 4. In some populations, the samaras are released over a long period from November into April; in others, they are released soon after matur- ing in Octobe
. The Canadian field-naturalist. 618 The Canadian Field-Naturalist Vol. 110. Figure 3. Swollen base of an Ontario Pumpkin Ash. Figure 5. A Pumpkin Ash tree growing in an oxbow pond along the Canard River, Essex County, Ontario. B 5cm. Figure 4. Fruits (samaras) of three ash species: (A) Pumpkin Ash, F. profunda; (B) Red Ash, F. penn- sylvanica; (C) White Ash, F. americana. Ontario material). The relative size of the samara is shown in Figure 4. In some populations, the samaras are released over a long period from November into April; in others, they are released soon after matur- ing in October. Seed collected in Ontario germinates readily into vigorous seedlings without pretreatment, regardless of the time of collection. Seedlings and small size classes can be found in stands with Pumpkin Ash. Pumpkin Ash usually grows in low areas where water stands at least part of the year (Figure 5). Its associates in Ontario include: Silver Maple, Acer saccharinum; White Elm, Ulmus americana; Pin Oak, Quercus palustris; Swamp White Oak, Q. bicolor; Shumard Oak, Q. shiimardii; Red Ash, F. pennsylvanica; Eastern Cottonwood, Populus del- toides; Black Gum, Nyssa sylvatica; willows, Salix spp. and Buttonbush, Cephalanthus occidentalis. Many of these communities would have previously (up to 1950s) been dominated by White Elm. The species is also found on mesic sites in Ontario; a fact which may be explained by the artifi- cial drainage of most of the now largely agricultural landscape. Early surveyors noted much wetter condi- tions. Patrick McNiff at Sandwich (near Windsor) in. 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 Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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