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Learn about the comparison among Musaceae, Zingiberaceae and Cannaceae.
Comparison # Musacase:
1. Flower-May be unisexual, bisexual or zygomorphic.
2. Perianth-6, 5 in two whorls or not distinct, petaloid, 6, in two whorls of 3 each, usually the outer green and inner coloured.
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3. Androecium-6, 5, only fertile, the sixth, sterile one not distinguishable as a petaloid staminode.
4. Gynoecium-(3): ovary trillocular, ∞ ovules, placentation axile.
Style-Simple.
Sigma-Lobed or capitate.
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5. Fruit-Berry or espsule.
6. Seed-With mealy endosperm. No aril.
Comparison # Zingiberaceae:
1. Flower-Bisexual, zygomorphic.
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2. Perianth-6, in two whorls of 3 each, outer sepaloid and inner petaloid.
3. Androecium-6, in two whorls of three each, one (posterior stamen of the inner whorl) fertile and functional; 1 (anterior stamen of the outer whorl) suppressed; the remaining 4 are modified into petaloid staminodes, the two staminodes of the inner whorl, however, fuse to form labellum.
4. Gynoecium- (3); ovary 1-3-locular, placentation axile or parietal.
Narrow and slender, lies in groove of the fertile stamen.
Variable.
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5. Fruit-Capsule
6. Seed-Arillate, endospermic
Comparison # Cannaceae:
1. Flower-Bisexual, asymmetrical.
2. Perianth-6 in two whorls of 3 each, outer sepaloid and inner petaloid.
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3. Androecium-6, ½ posterior anther of the inner whorl fertile, other 1/2 is petaloid, 1 suppressed (anterior of outer whorl), other 4 (2 anterior +2 posterior) modified into petaloid staminodes of which one in the inner whorl is the largest and is modified into labellum.
4. Gynoecium- (3); ovary 3-celled, placentation axile.
Petaloid, gaudy.
Terminal, somewhat oblique.
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5. Fruit-Capsule
6. Seed-Arillate, endosperm scanty.
