1	Foliage with glandular trichomes, the plants sticky to the touch	S. pruinosum
–	Foliage lacking glandular trichomes, the plants not sticky to the touch	2
2	Inflorescences many (4–7) times branched; mature berries red	S. corymbosum
–	Inflorescences unbranched or at most forked; mature berries green, purple or black	3
3	Anthers 1.2–1.5 mm long, almost globose; berries very shiny; pedicels not dropping with the berry, remaining on the rhachis; calyx lobes strongly reflexed in fruit; stone cells 0(4)	S. americanum
–	Anthers more than 2 mm long, ellipsoid or slightly tapering; berry matte or somewhat shiny, not very shiny; pedicels dropping with the berries, not remaining on the plant; calyx lobes appressed to somewhat reflexed in fruit, at least the bases appressed to the berry; stone cells 2–6(–13)	4
4	Free portion of the filaments ca. 1/4 the length of the anthers; buds ovoid, tapering at the apex; plants usually white-pubescent	S. douglasii
–	Free portion of the filaments from half as long as the anthers to almost equal their length; buds ellipsoid; plants glabrous to white pubescent	5
5	Anthers less than 3 mm long; corolla 8–10 mm in diameter; fruiting pedicels 10–12 mm long, somewhat deflexed; wide variety of forest types and open areas	S. nigrescens
–	Anthers more than 3 mm long; corolla to 20 mm in diameter; fruiting pedicels 15–17 mm long, strongly deflexed; cloud forests	S. macrotonum