1	Calyx covered with appressed straight hairs only		(2)
+	Calyx covered, at least in lower half, with spreading ± curved to uncinate hairs		(3)
2 (1)	Style shorter than the fruiting calyx		1 Myosotis caespitosa
+	Style as long as the fruiting calyx		2 Myosotis palustris
3 (1)	Annuals. Pedicels shorter than the fruiting calyx		(4)
+	Perennial or biennials. Pedicels equal to or longer than fruiting calyx		(5)
4 (3)	Calyx erect, ± appressed to the flowering axis; lower half of calyx mostly with curved to uncinate hairs		3 Myosotis stricta
+	Calyx spreading to deflexed; lower half of calyx mostly with appressed hairs with few uncinate ones		4 Myosotis refracta subsp. chitralica
5 (3)	Nutlets ± obtuse at apex, margined only on upper half		5 Myosotis alpestris subsp. asiatica
+	Nutlets ± acute at apex, uniformly margined		(6)
6 (5)	Stern ± flaccid, generally less branched. Calyx open in fruit. Corolla limb 5-7 mm broad		6 Myosotis sylvatica
+	Stem (-s) not flaccid; much branched. Calyx lobes ± constricted in fruit. Corolla limb 2.5-4 mm broad		7 Myosotis arvensis