. The Canadian field-naturalist. 1978 Notes 75. Figure 1. The Ontario distribution of Lvthrum alatum as known from the following herbaria: CAN, DAO, OAC, QK, TRT, and UWO. New England States, but the early date of 1898 (or 1889) would indicate that it was probably of native origin. The Carleton County localities are in the midst of the Ottawa-Carleton Regional Forest. The Prairie White Fringed Orchid (Habenaha leucophaea), a species centered about the lower Great Lakes, has only recently been reported here and was formerly known from near Port Hope in Durham County (Reddoch 1977). This occurre
. The Canadian field-naturalist. 1978 Notes 75. Figure 1. The Ontario distribution of Lvthrum alatum as known from the following herbaria: CAN, DAO, OAC, QK, TRT, and UWO. New England States, but the early date of 1898 (or 1889) would indicate that it was probably of native origin. The Carleton County localities are in the midst of the Ottawa-Carleton Regional Forest. The Prairie White Fringed Orchid (Habenaha leucophaea), a species centered about the lower Great Lakes, has only recently been reported here and was formerly known from near Port Hope in Durham County (Reddoch 1977). This occurrence of a native plant with disjunct distribution similar to that of L. alatum supports the possibility that L. alatum is also native in both Carleton and Durham Counties. Lafontaine and White (1974) reported L. alatum from Shirleys Bay on the Ottawa River near Ottawa, presumably on the basis of a sight record, but this was later discounted (White 1977) because no voucher specimen could be found, and a detailed search in the field failed to turn it up. The report from British Columbia (Fernald 1950; Henry 1915; Macoun 1895) is based on a collection from Griffin Lake in the Kamloops District {John Macoun , 6 July 1889, CAN). J. M. Macoun (1895) commented "It is possible that the seeds of the Griffin Lake plants were in some way introduced, though this is not ; Lythrum alatum has not been collected in British Columbia since 1889. The British Columbia collection is disjunct from sites in the western United States. The native L. alatum may be readily distinguished from L. salicaria by its linear-lanceolate to oblong- ovate rather than lanceolate leaves; single smaller flowers in the axils of small usually alternate leaves, rather than densely cymose in the axils of whorled or opposite leaves; the glabrous narrowly oblong rather than more or less pubescent somewhat thickened- urceolate calyx; and the wing-margined angles of the upper branches and calyx. Literat
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