. The Canadian field-naturalist. 1991 Notes 393. Figure 1. Flowering stem of a Large-flowered Bellwort, Uvularia grandiflora. The flower has some perianth parts removed. three anthers finished dehiscing, the second set began. Thus pollen presentation lasted for a total 4-6 days during the life of a flower. The corolla began to wither approximately one week after open- ing. Ovules ranged from 6 to 14 per locule (x = , = ). The capsule matured and seeds dehisced from mid-July to early August. U. grandiflora is mostly self-incompatible, with few seeds resulting from apomictic, self,
. The Canadian field-naturalist. 1991 Notes 393. Figure 1. Flowering stem of a Large-flowered Bellwort, Uvularia grandiflora. The flower has some perianth parts removed. three anthers finished dehiscing, the second set began. Thus pollen presentation lasted for a total 4-6 days during the life of a flower. The corolla began to wither approximately one week after open- ing. Ovules ranged from 6 to 14 per locule (x = , = ). The capsule matured and seeds dehisced from mid-July to early August. U. grandiflora is mostly self-incompatible, with few seeds resulting from apomictic, self, or bagged treatments (Table 1). The open pollinated control and forced cross-pollinated groups produced signifi- cantly more seeds than the other treatments. Control seeds were significantly heavier than forced cross- pollinated seeds (p < , t-test), and though not significant at the level, cross-pollinated flowers tended to produce more seeds than control flowers ( < p < , t-test). Number and size of seeds in a capsule showed a negative but insignificant corre- lation (r = , < p < ). Multiplying average seed number by average seed weight for forced cross-pollinated and open-pollinated capsules (a rough estimate of resources used per capsule), resulted in both groups having identical average cap- sule weights of g/capsule. With the exception of one Andrena sp. that was found inactive inside of a flower, only the bumble- bee, Bombus griseocollis De Geer, was seen visiting U. grandiflora flowers. All B. griseocollis observed (23) were queens except two workers collecting pollen in late April and early May. The first queens observed visiting the U. grandiflora flowers were not collecting pollen as indicated by empty corbicu- la; however, pollen was observed on their mandibles. Foraging movements were usually direc- tional through a patch with the bee flying from one flower to the next neighboring flower. Only one flower hervivore, a
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