1	Exocarp dry and membranous, fruit expanding into a ball; stone spindle-shaped; leaf blade linear to oblanceolate-linear.		1 N. sphaerocarpa
+	Fruit a fleshy drupe; stone narrowly ovoid, ovoid, or oblongly conic; leaf blade broader than linear		(2)
2 (1)	Fruit 8-15 mm in diam.; stone 8-10 mm; leaf blade 7-20 mm wide.		2 N. roborowskii
+	Fruit 5-9 mm in diam.; stone 4-7.5(-8) mm; leaf blade 2-8 mm wide		(3)
3 (2)	Fruit nearly globose or ellipsoid; mesocarp dark blue to purplish; stone 4-5 mm; leaves 4-6 in fascicles on young branches; leaf blade oblanceolate.		3 N. sibirica
+	Fruit ovoid to sometimes ellipsoid; mesocarp rosy or dark cherry red; stone 5-7.5(-8) mm; leaves 2 or 3 in fascicles on young branches; leaf blade broadly oblanceolate or linear-spatulate		(4)
4 (3)	Fruit 1-1.3 cm, dark red; mesocarp rosy; stone 5-6 mm; leaf blade broadly oblanceolate to oblanceolate, 1.8-2.5 cm × 6-8 mm, apex obtuse.		4 N. tangutorum
+	Fruit 0.8-0.9 cm, cherry-colored; mesocarp cherry-colored; stone 6.5-7.5 mm; leaf blade linear-spatulate, (0.5-)1-1.7(-2.5) cm × (1.5-)2-3.5(-5) mm, apex acute to obtuse.		5 N. pamirica