1	"Anthers 3, the laterals fertile the median sterile (Subfamily Cypripedioideae)"	"Orchidaceae - Group 1"
1	"Anther solitary"	2
2	"Anther erect or bending back from column, projecting well beyond the stigma; pollinia usually soft and mealy; plants often terrestrial"	3
2	"Anther not as above; pollinia usually hard and waxy; plants often epiphytic or epilithic"	7
3	"Pollinia attached to viscidium by their tip; anther usually dorsal; tubers absent although roots often thick and fleshy (Subfamily Spiranthoideae)"	4
3	"Pollinia attached to viscidium by their base; anther usually ventral; tubers usually present (Subfamily Orchidoideae)"	5
4	"Rhizomes elongate with scattered roots; pollinia deeply lobed (Tribe Erythrodeae)"	Ludisia
4	"Rhizomes short with clustered roots; pollinia not deeply lobed (Tribe Cranichideae)"	"Orchidaceae - Group 2"
5	"Anther separated from rest of column by a distinct constriction; caudicles usually absent (Tribe Diurideae)"	"Orchidaceae - Group 3"
5	"Anther not separated from rest of column by a constriction; caudicles usually present"	6
6	"Anther erect (Tribe Orchideae)"	"Orchidaceae - Group 4"
6	"Anther bending back from column, sometimes completely reversed (Tribe Diseae)"	Disa
7	"Anther erect early, bending down at right angles to tip of column at maturity, opening apically; viscidium and stipe usually absent; inflorescences usually terminal (Subfamily Epidendroideae)"	8
7	"Anther erect at all stages of development, very short, opening basally; viscidium and stipe usually present; inflorescences usually lateral (Subfamily Vandoideae)"	11
8	"Pseudobulbs usually fleshy and corm-like; leaves usually large and pleated; inflorescences mostly lateral; pollinia 8 (Tribe Arethuseae)"	"Orchidaceae - Group 5"
8	"Combination of features not as above"	9
9	"Pseudobulbs comprised of a single internode; column often prominently winged at tip; pollinia 2 or 4 with large caudicles (Tribe Coelogyneae)"	"Orchidaceae - Group 6"
9	"Combination of features not as above"	10
10	"Pollinia lacking caudicles and other appendages; column with no foot (Tribe Malaxideae)"	Liparis
10	"Pollinia usually with caudicles; leaves usually 2-ranked, folded, rarely pleated; column often with prominent foot (Tribe Epidendreae)"	"Orchidaceae - Group 7"
11	"Plants monopodial (Tribe Vandeae)"	"Orchidaceae - Group 8"
11	"Plants usually sympodial"	12
12	"Pollinia 2 (Tribe Cymbidieae)"	"Orchidaceae - Group 9"
12	"Pollinia 4"	13
13	"Pseudobulbs usually fleshy and corm-like; leaves usually large and pleated (Tribe Maxillarieae)"	"Orchidaceae - Group 10"
13	"Pseudobulbs usually reed-like; leaves usually folded but not pleated (Tribe Polystachyeae)"	Polystachya