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

	plants hairy or downy; NOT [plants almost hairless]
	leaves opposite; NOT [leaves in whorls]
	leaves oblong or oval; NOT [leaves ovate or lanceolate], NOT [leaves linear]
	leaves rounded or almost cordate at base; NOT [leaves tapered at base]
	flowers purplish or greenish; NOT [flowers rose or red]
	hoods of corona long, three times longer than stamens; NOT [hoods of corona short, not much longer than stamens]
	hoods of corona lanceolate; NOT [hoods of corona blunt]
	corona hoods each with an incurved horn within; NOT [corona hoods without an incurved horn within]
	pods with soft tubercles; NOT [pods lacking tubercles]

Asclepiadaceae: 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 with milky juice
	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]
	stamens united; NOT [stamens distinct]
	pollens grains united into a mass; NOT [pollen grains separate]
	styles distinct; NOT [styles united]
	ovary superior; NOT [ovary inferior]