. The Canadian field-naturalist. Natural history. 82 The Canadian Field-Naturalist. Figure \. Herbarium specimen of plants collected , Banks Island, Aulavik National Park, 73°46' N; 119°56' W, 10 July 1999, S. G. Aiken 99-230 (CAN 582410). Left, submerged plant with thin, flexuous, aquatic leaves and long rhizomes; right, plant devel- oping characteristically distichous, more rigid, emergent leaves. pieces of stranded straw. Samples were collected and preserved as a herbarium specimen (CAN 582408, Figure 2). Twenty-six additional detached stems with new growth, along with some of the mos
. The Canadian field-naturalist. Natural history. 82 The Canadian Field-Naturalist. Figure \. Herbarium specimen of plants collected , Banks Island, Aulavik National Park, 73°46' N; 119°56' W, 10 July 1999, S. G. Aiken 99-230 (CAN 582410). Left, submerged plant with thin, flexuous, aquatic leaves and long rhizomes; right, plant devel- oping characteristically distichous, more rigid, emergent leaves. pieces of stranded straw. Samples were collected and preserved as a herbarium specimen (CAN 582408, Figure 2). Twenty-six additional detached stems with new growth, along with some of the moss on which stems were lying, were collected. They were transported to Banks Island, Sachs Harbour, 71°59'N, 125°20'W, on 13 July 1999 where the straw was sorted into 13 approximately matched pairs of stems of similar length, width, and shoot development. One set remained in Sachs Harbour and the other set was transported to a private home in Ottawa-Carleton, Ontario, 45° 16' N, 75°46' W. In both locations, the moss was placed in the bottom of a shallow container and the stems were laid on top. Pond or rainwater was used to saturate the moss to duplicate the conditions where the samples were col- lected. The containers were placed outdoors in Sachs Harbour on 14 July, where temperatures were l-3°C, and there was 24-hour daylight and in Ottawa on 16 July, where temperatures were I7-32°C, and there was a day-night cycle. Observations were made as the season progressed. When it appeared that lack of nutrients may be limit- ing growth, a 10 cm layer of soil was placed under the moss on which the culms were lying. Results Description of aquatic leaves in Aquatic or submerged leaves are long, narrow, and pale pinkish brown. They look similar to the aquatic leaves of the grass Pleuropogon sabinei Figure 2. Voucher herbarium specimens collected , Banks Island, Aulavik National Park, 73°46' N; 119°56' W, 10 July 1999, S. G. Aiken 99-230c (CAN 582408). Left, two t
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