1	"Stems distinctly flattened at least in part"	2
1	"Stems cylindrical or angled "	3
2	"Stem segments variable in width and number of angles "	"Rhipsalis pachyptera"
2	"Stem segments all similar, widest in upper half "	"Rhipsalis micrantha"
3	"Stems distinctly ribbed, mostly 1–6 cm wide "	"Rhipsalis cereoides"
3	"Stem segments cylindrical or club shaped—if slightly angled then less than 4 mm wide "	4
4	"Flowers lateral, less than 6 mm wide; branchlets less than 2 mm wide "	"Rhipsalis capilliformis"
4	"Flowers at the tips of segments, more than 1 cm wide; stems mostly more than 1 cm wide "	5
5	"Segment bristles 4–6 mm long, ovary and fruit with bristles "	"Rhipsalis pilocarpa"
5	"Segment bristles where present 1–2 mm long; ovary and fruit hairless "	6
6	"Stem segments a mixture of long ones bearing clusters of short ones; flowers white "	"Rhipsalis cereuscula"
6	"Segments similar, cylindrical with a narrowing at one end; flowers yellow or orange "	"see Hatiori salicornioides"