Speciation Stories for Field Botany, PBIO 109

Larkspurs (Guerrant) dramatic differences; simple genetic changesColumbines (Koontz) direction and rate of change with selectionLeavenworthia (Rollins) ecological isolation and differential selectionSky Pilots (Galen) ecological isolation and differential selectionBeachpeas (Schmitz) geographic isolation and ice-age refugia

Delphinium decorum

Delphinium nudicaule

D. cardinalealso from western North America

Only remotely related - see Koontz et al. 2004

frmo Koontz, 2004

Distribution of Delphinium decorum, D. nudicaule, and their hybrid D. luteum.

from Koontz et al., 2001

Columbine pollinator changes

Pollinator shifts drive increasingly long nectar spurs in columbine flowers. Whittall and Hodges, 2007 ---- Nature 447: 706-710.

Leavenworthia

Leavenworthia crassa

Leavenworthia exigua

Polemonium viscosum - the sky pilot

Odor Corolla Flair

narrow wide

skunky COMMON RARE (sepals) UP HIGH

Odor

sweet RARE COMMON (petals) DOWN LOW

SKY PILOT VARIANTSAnd ELEVATION

Lathyrus japonicus

References

Galen et al. 1987. Pollination in floral scent morphs of Polemonium viscosum. Evolution.Guerrant, 1982. Neotrenic evolution in larkspurs. Evolution.Schmitz, 2002. The evolutionary and biogeographic history of Lathyrus japonicus (beach pea) in North America, PhD thesis UVM.Solbrig and Rollins. 1977. The evolution of autogamy in species of Leavenworthia. Evolution.Whittall and Hodges . 2007. Pollinator shifts drive increasingly longer spurs in columbines. Nature.