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The following points highlight the top twenty nine components of androecium in plants. Some of the components are: 1. Stamen 2. Monandrous 3. Diandrous 4. Triandrous 5. Tetrandrous 6. Polyandrous 7. Monadelphous 8. Diadelphous 9. Polyadelphous 10. Syngenesious 11. Synandrous 12. Antipetalous 13. Antiphyllous 14. Alternipetalous 15. Epipetalous 16. Episepalous 17. Epiphyllous and a few others.
Androecium in Plants: Component # 1. Stamen:
Male reproductive organ of the flower, consisting of a stalk – like filament, anther lobes and connective (Fig. 84).
Androecium in Plants: Component # 2. Monandrous:
Flowers with one stamen, e.g., Euphorbia.
Androecium in Plants: Component # 3. Diandrous:
Flowers with two stamens, e.g., Coronopus.
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Androecium in Plants: Component # 4. Triandrous:
Flowers with three stamen, e.g., Triticum.
Androecium in Plants: Component # 5. Tetrandrous:
Flowers with four stamens, e.g., Scoparia.
Androecium in Plants: Component # 6. Polyandrous:
When stamens are many and free, e.g., Corchorus.
Androecium in Plants: Component # 7. Monadelphous:
When all the filaments are fused to form a single tube but their anthers are free, e.g., Hibiscus (Fig. 84).
Androecium in Plants: Component # 8. Diadelphous:
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When filaments are united in two groups with their anthers being free, e.g., Lathyrus (Fig. 84).
Androecium in Plants: Component # 9. Polyadelphous:
When filaments are united in many groups with their anthers remaining free, e.g., Ricinus, Citrus, etc.
Androecium in Plants: Component # 10. Syngenesious:
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When all anthers are united in one group with their filaments free, e.g., Asteraceae (Fig. 84).
Androecium in Plants: Component # 11. Synandrous:
When all anthers as well as filaments are united and form one group, e.g., members of Cucurbitaceae.
Androecium in Plants: Component # 12. Antipetalous:
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Stamens opposite to the petals, e.g., Coriandrum.
Androecium in Plants: Component # 13. Antiphyllous:
Stamens opposite to the tepals, e.g., Chenopodium.
Androecium in Plants: Component # 14. Alternipetalous:
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When stamens are present alternately with the petals.
Androecium in Plants: Component # 15. Epipetalous:
When stamens are attached with the petals, e.g.. Petunia.
Androecium in Plants: Component # 16. Episepalous:
When stamens are fused with the sepals, e.g., some species of Verbena in which petals are absent.
Androecium in Plants: Component # 17. Epiphyllous:
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When stamens are fused with the tepals, e.g., Asparagus.
Androecium in Plants: Component # 18. Gynandrous:
When stamens are united with gynoecium, e.g., Cryptostegia, Calotropis.
Androecium in Plants: Component # 19. Didynamous:
When two stamens out of a total of four are large and remaining two are smaller in size, e.g., Leucas, Ocimum (Fig. 84).
Androecium in Plants: Component # 20. Tetradynamous:
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When four stamens out of a total of six are large and remaining two are smaller in size, e.g., members of Cruciferae.
Androecium in Plants: Component # 21. Obdiplostamenous:
When stamens are arranged in two whorls, with its outer whorl of stamens being opposite to petals, e.g., members of Rutaceae.
Androecium in Plants: Component # 22. Basifixed:
Filaments attached to the base of anther lobes, e.g., Raphanus sativus.
Androecium in Plants: Component # 23. Dorsifixed:
When filament is attached to the connective at one point on the dorsal side of anther lobes, e.g., Passiflora (Fig. 85).
Androecium in Plants: Component # 24. Adnate:
When filament runs throughout the entire length of the anther from the base to the top, e.g., Magnolia.
Androecium in Plants: Component # 25. Versatile:
When the filament is attached on the dorsal side in the middle of the anther lobe in such a way so that the latter may move to and fro, e.g., Pancratium.
Androecium in Plants: Component # 26. Introrse:
When dehiscence occurs on the inner (adaxial) side of the flower, e.g., members of Leguminosae.
Androecium in Plants: Component # 27. Extrorse:
When the dehiscence occurs on the abaxial side of the flower, e.g., members of Papaveraceae.
Androecium in Plants: Component # 28. Laterose:
When the dehiscence occurs on the lateral side, e.g., members of Butomaceae.
Androecium in Plants: Component # 29. Staminode:
Sterilie stamens with reduced anther lobes which do not bear pollen grains, e.g., Veronica.
