Convolvulus: Answers to key questions in Flora of the Great Plains leading to this genus. 

	calyx not enclosed by 2 foliaceous bracts, the bracts small and linear
	corolla 0.5-3 cm long; NOT [corolla 4-6 cm long]

Convolvulaceae: Answers to key questions in Budd's Flora  leading to this family. 

	herbs; NOT [shrubs or trees]
	plants green or with some chlorophyll; NOT [plants parasitic or saprophytic, without chlorophyll]
	plants without milky juice
	twining plants
	flowers not in heads or spikes; NOT [flowers in long or short spikes], NOT [flowers in heads or in form resembling a head]
	flowers with two floral rings, but with the petals wholly or partly united forming a tube or bell
	corolla regular; NOT [corolla irregular]
	corolla funnelform
	corolla large
	ovary superior; NOT [ovary inferior]