1	Berry purple-black, globose; thorns occurring singly at nodes; leaves narrowly linear, fleshy; corolla tube 3-4 × as long as limb and lobes; filaments pubescent		1 Lycium ruthenicum
+	Berry red or orange-yellow, elongated or sometimes globose; thorns usually clustered with leaves and flowers, rarely lacking; leaves broader, linear-lanceolate, lanceolate, or elliptic, fleshy or not; corolla tube ca. 2 × as long as limb and lobes or shorter; filaments glabrous or pubescent.		(2)
2 (1)	Corolla lobed about 1/4 way down; filaments sparsely pubescent near base.		(3)
+	Corolla lobed 1/3 way down or more; filaments and corolla with a villous ring just above point of insertion.		(4)
3 (2)	Branches slender, flexible; leaves narrow, widest near middle; calyx truncate at apex or unequally divided, lobes not ciliate; apex of young fruit mucronate from a persistent style		2 Lycium truncatum
+	Branches stout, stiff; leaves usually oblanceolate, sometimes broadly so; calyx lobed halfway down, lobes usually ciliate; apex of young fruit rounded		3 Lycium dasystemum
4 (2)	Corolla less than 7 mm; stamens manifestly exceeding corolla; seeds ca. l mm; berry globose, ca. 4 mm		7 Lycium yunnanense
+	Corolla more than 9 mm; stamens shorter than or slightly exceeding corolla; seeds 2-3 mm; berry oblong or ellipsoid, more than 5 mm.		(5)
5 (4)	Calyx usually 2-lobed; corolla lobes marginally glabrescent, tube and limb funnelform, obviously longer than lobes		4 Lycium barbarum
+	Calyx usually 3-lobed or 4- or 5-dentate; corolla lobes marginally pubescent, tube cylindric or funnelform, about as long as lobes.		(6)
6 (5)	Corolla tube cylindric, longer than lobes; leaves lanceolate		5 Lycium cylindricum
+	Corolla tube funnelform, shorter than or subequaling lobes; leaves mostly broadly or narrowly ovate, rhomboid, or elliptic		6 Lycium chinense