Answers are grounded in this paper and cite their sources.
RUST, RICHARD W. (Dept. Entomol. Appl. Ecol., Univ. Delaware, Newark, DE 19711). Pollination in Impatiens capensis and Impatiens pallida (Balsaminaceae). Bull. Torrey Bot. Club 104: 361-367. 1977.-The comparative pollination ecology of sympatric populations of Impatiens capensis and I. pallida is presented. Both species flower at the same time, produce nectar in nearly equal amounts and equal sugar concentration. TrIpatiens capensis nectar contains twice the amino acid concentration as I. pallida. Individual flowers of I. capensis bloom for about 2 days, while I. pallida blooms for 3 days. Both species require cross pollination of chasmogamous flowers for successful seed production. Impatiens capensis has 7 times as many species of insect visitors as I. pallida and this is related to the structure and position of the nectar-containing sepal spur. Both species share the same principal bee pollinator, Bomnbus vagans, and average over 70% chasmogamous flower-to-seed success as measured over the flowering season.
No takes yet. Share an insight, caveat, or question.
Richard W. Rust (1977) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: