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

	plant tuber-bearing; NOT [plant without tubers]
	lower and middle leaves sessile; NOT [lower and middle leaves with petioles or narrow bases]
	lower and middle leaves serrate; NOT [lower and middle leaves incised or pinnatifid]
	calyx lobes longer than nutlets; NOT [calyx lobes not as long as nutlets]
	calyx lobes narrow and acute; NOT [calyx lobes ovate and blunt]
	nutlets with the upper outer margin truncate; NOT [nutlets with the upper outer margin well rounded]
	nutlets with upper outer margin often undulate; NOT [nutlets with the upper outer margin entire]

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

	plants of moist habitats; NOT [plants of dry habitats]
	perennial; NOT [annual]
	leaves not palmately lobed, crenate to serrate; NOT [leaves palmately 3-lobed]
	flowers in axillary clusters; NOT [flowers solitary or in axillary racemes], NOT [flowers terminal, in head-like clusters or spike-like racemes]
	flowers sessile; NOT [flowers pedicellate]
	calyx indistinctly 2-lipped or regular; NOT [calyx distinctly 2-lipped, the upper part differing from the lower part] (BF)
	calyx without hooks at tips of lobes; NOT [calyx with 10 lobes, each hooked at the tip]
	corolla 4- or 5- lobed, hardly, if at all, 2-lipped; NOT [corolla distinctly 2-lipped]
	corolla white; NOT [corolla blue or lavender]
	stamens 2 (staminodes may be present); NOT [stamens 4]

Labiatae: 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 not aquatic
	stems square
	leaves opposite
	leaves not bearing bladders
	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
	petals wholly or partly united forming a tube or bell]
	corolla irregular; NOT [corolla regular]
	ovary superior; NOT [ovary inferior]
	fruit with 4 nutlets; NOT [fruit a many-seeded capsule]