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of C. barbatus and C. pallidus barely overlap, and little pollen transfer occurs
between them (Thien 1973 ). In addition, the flowers of C. multiflorus produce
a strong, pungent fragrance at peak anthesis, whereas those of C. barbatus and
C. pallidus , respectively, have either no odor or only an occasional, weak fragrance
(Goldman and Orzell 2000 ). Thus, pollinator attraction may differ. Heinrich ( 1975 )
and Luer ( 1975 ) reported species of Bombus , Xylocopa virginica and Apis mellifera
as pollinators of C. pallidus . Robertson ( 1887 ) reported Augochloropsis sumptuosa
(Smith) (as Augochlora sumptuosa (Smith)) and an unidentified species of
Augochlora as pollinators of C. barbatus. Both were females. The pollination
mechanism is the same as reported for C. tuberosus with pollen attaching dorsally
to the first abdominal segment. Bombus griseocollis , Augochlora pura pura (Say),
(as A. festiva Smith) and unidentified species of Halictus Latreille also occasionally
visited the flowers but were ineffective pollen vectors (Robertson 1887 , cf. Thien
1973 ). Rare natural hybridization events among these species are not, however,
unknown (Goldman and Orzell 2000 ; Goldman et al. 2004 ).
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