Cuscuta: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 

	yellow or reddish parasitic plants; NOT [green plants]
	plants with a few very small scale-like leaves; NOT [leafy plants]
	flowers 1-5 mm wide, borne in clusters; NOT [plants with large flowers]

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]