Identification of grass and morningglory species with simple dichotomous keys

Agriprofessionals and technical college students took an examination without and with simple dichotomous keys. Without keys, only 15% and 30% of the agriprofessionals identified 71% or more of the grass and morningglory species (Ipomoea spp. # IPOZZ), respectively; 97% scored in this range for both...

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