What’s a dichotomous key? Help

Fragaria

Fernald (1950) reports that Fragaria vesca occasionally hybridizes with F. virginiana var. glauca (using the varietal epithet terrae-novae) in northern ME. However, collections of such hybrids are unknown. Reference: Staudt (1999).

Choose this species
F. virginiana
1a. Terminal tooth of leaflets commonly less than half as wide as adjacent teeth and surpassed by them [Fig. 841]; leaflets usually petiolulate; petals 7–10 (–12) mm long; achenes embedded in the surface of the fruiting receptacle; inflorescence resembling a corymb
Choose this species
F. vesca
1b. Terminal tooth of leaflets commonly more than half as wide as adjacent teeth and surpassing them; leaflets usually sessile or nearly so; petals 4–7 mm long; achenes not or only slightly embedded in the surface of the fruiting receptacle; inflorescence resembling a raceme or panicle

Show photos of: Each photo represents one species in this genus.