. The Canadian field-naturalist. 422 The Canadian Field-Naturalist Vol. 93. Figure 4. Sweet Low bush Blueberry seedlings. Approximate age 3 yr upper left and 4 yr lower right. The latter has begun to form a rhizome (indicated by arrow). 7. Reproduction (a) Floral biology. The flowers are insect pollinated, but not very attractive to bees, probably because the nectar volatiles are simple acetaldehyde and ethanol (Hall, Forsyth, Lightfoot, and Boch 1971). The stamens and pistil are functional as soon as the flower fully opens. The pistil remains highly receptive under field conditions for 4 d bu
. The Canadian field-naturalist. 422 The Canadian Field-Naturalist Vol. 93. Figure 4. Sweet Low bush Blueberry seedlings. Approximate age 3 yr upper left and 4 yr lower right. The latter has begun to form a rhizome (indicated by arrow). 7. Reproduction (a) Floral biology. The flowers are insect pollinated, but not very attractive to bees, probably because the nectar volatiles are simple acetaldehyde and ethanol (Hall, Forsyth, Lightfoot, and Boch 1971). The stamens and pistil are functional as soon as the flower fully opens. The pistil remains highly receptive under field conditions for 4 d but fertility drops to about 20% by the 7th d (Wood 1962). Wood (1961a) also found that nectar volume and weight of nectar sugar increased with the flower age. After pollination the corolla turns pink and deteriorates very rapidly. This is associated with a marked increase in ethylene production (Hall and Forsyth 1967) and a high rate of respiration (Forsyth and Hall 1969) which persists through the small green fruit stage. Glasshouse studies indicate that flowers selfed using pollen from the same flower or any flower of the same clone do not generally set fruit (Aalders and Hall 1961). The results of intercrossing and selfing six clones of V. angustifolium are given in Table 2. The vascular anatomy of the ovary has been described bv Bell and Giffin (1957). (b) Seed production and dispersal. It is rare to find a seedless fruit of V. angustifolium even in highly productive clones. Table 2 shows the number of seeds per berry in crosses completed in 1977 and 1978 among six 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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