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A:(A)
Start with beginning of main key.
next:1

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A:(B)
Gymnospermae.
next:2

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A:(C)
Monocotyledones.
next:17

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A:(D)
Dicotyledones.
next:158

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B:(A)
previous:A
(Hemi-) parasites or saprophytes. (Dicotyledones only!)
next:2102

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B:(B)
Autotrophic plants or parasitic or saprophytic condition not distinct. (Parasites and saprophytes are also included in the main key!)
next:159

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C:(A)
previous:B
see:D
Flowers apetalous. (read 159 and 160 very carefully!)
next:161

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C:(B)
Flowers choripetalous. (read 159 and 160 very carefully!)
next:547

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C:(C)
Flowers sympetalous. (read 159 very carefully!)
next:1572

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D:(A)
previous:C
Bisexual and female flowers without a perianth.
next:162

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D:(B)
Bisexual and female flowers with a perianth.
next:231

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E:(A)
previous:D
Ovary superior.
next:232

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E:(B)
Ovary inferior or hemi-inferior.
next:459

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F:(A)
previous:C
see:G
Flowers hypogynous. (read 548 very carefully!)
next:548

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F:(B)
Flowers epi- or perigynous. (read 548 very carefully!)
next:1149

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G:(A)
previous:F
see:H
Disk absent.
next:549

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G:(B)
Disk present.
next:926

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H:(A)
previous:G
Stamens 1 -10.
next:550

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H:(B)
Stamens 11 or more.
next:805

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I:(A)
previous:G
Stamens 1 - 10.
next:927

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I:(B)
Stamens 11 or more.
next:1106

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J:(A)
previous:F
Ovary superior.
next:1150

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J:(B)
Ovary inferior or hemi-inferior.
next:1371

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K:(A)
previous:C
see:L
Ovary superior.
next:1573

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K:(B)
Ovary inferior or hemi-inferior.
next:2003

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L:(A)
previous:K
see:M
Corolla actinomorphic.
next:1574

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L:(B)
Corolla zygomorphic.
next:1896

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M:(A)
previous:L
Base of filaments free from the corolla.
next:1575

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M:(B)
Filaments adnate to the corolla.
next:1654

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N:(A)
previous:M
Fertile stamens less than the corolla-lobes.
next:1655

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N:(B)
Fertile stamens as many as the corolla-lobes.
next:1681

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N:(C)
Fertile stamens more than the corolla-lobes.
next:1859