1	Main stems creeping or suberect, fertile stems not erect	2
–	Main stems creeping, fertile stems erect	S. kurzii
2	Ventral leaves strongly overlapping stems and branches, basiscopic base exauriculate and margins ciliolate	S. amblyphylla
–	Ventral leaves not overlapping stems and branches, basiscopic base slightly auriculate and margins entire or ciliolate	3
3	Plants 40–50 cm long, main stems unbranched in lower to middle part, with stolons at bases, basiscopic base of ventral leaves slightly auriculate, acroscopic base denticulate or ciliolate at margins	S. bodinieri
–	Plants about 15–25 cm long, main stems branched from near base, rhizophores restricted to lower part of stem, basiscopic base ventral leaves entire, acroscopic base rather long ciliolate at margins	S. dianzhongensis