. The Canadian field-naturalist. POLYGONUM PENSYLVAKlirii POLYGONUM PERSICARIA. POLYGONUM SCABRUM 1 CM 2 CM OCREA PEDUNCLE SPIKE 3 MM PERIANTH 3 MM ACHENE Figure I. Ocreae, peduncles, spikes, perianths, and achenes (surface and cross sectional views) of annual smartvveeds show ing major distinguishing features used in the key (Table 2). Spikes of (a) P. lapathifolium variety lapathifolium. and (b) P. lapathifolium variety salicifolium. Peduncles of (c) P. pensylvanicum, varieties laevigatum and pensylvanicum. (d) P. pensylvanicum variety eglandulosum, and (e) P. pensylvanicum variety hybrid du
. The Canadian field-naturalist. POLYGONUM PENSYLVAKlirii POLYGONUM PERSICARIA. POLYGONUM SCABRUM 1 CM 2 CM OCREA PEDUNCLE SPIKE 3 MM PERIANTH 3 MM ACHENE Figure I. Ocreae, peduncles, spikes, perianths, and achenes (surface and cross sectional views) of annual smartvveeds show ing major distinguishing features used in the key (Table 2). Spikes of (a) P. lapathifolium variety lapathifolium. and (b) P. lapathifolium variety salicifolium. Peduncles of (c) P. pensylvanicum, varieties laevigatum and pensylvanicum. (d) P. pensylvanicum variety eglandulosum, and (e) P. pensylvanicum variety hybrid durum X pensylvanicum. Cross sections of (0 trigonous and (g) lenticular achenes of P. persicaria. vanicum and variety laevigatum Fern, are both common and have similar distributions; however, their main centers of density differ. Variety pensyl- vanicum predominates on the Niagara peninsula, but variety laevigatum is the most frequent variety in the vicinity of Ottawa and in Elgin and counties. Many intermediates between these varieties were noted and, for mapping purposes, were assigned to the variety which they most closely resembled. Two specimens were identified by the authors as inter- mediates between variety durum Stanford and \ariety pensylvanicum. These had been collected from Point Edward. Lambton County (DAO 1862) and Birch Island, Lake Huron (CAN 44437). No mention is made of the occurrence of variety durum in Ontario by Scoggan (1978); however, Gleason (1958) reports a. 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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