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Hydrocharitaceae A. L. de Jussieu
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habit
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herbaceous plants
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important diagnostics
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aquatic plants, leaves floating or submerged, spiny stems or leaves
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distribution
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African, Asian, Australian and Oceanian, European, North American, South American
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leaf: position
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opposite or verticillate, alternate, distichous
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leaf: nature
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not compound
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leaf: venation
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pinnate or hardly visible in leaves or leaflets., invisible or leaves 1-nerved, longitudinal in leaves or leaflets
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margin
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with entire margin, dentate
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leaf: stipules
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absent, present
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inflorescence
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solitary, raceme, umbel, simple, sympodial
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flower: sexuality
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bisexual, unisexual
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flower: symmetry
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actinomorphic, zygomorphic or irregular
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flower: receptacle
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enlarged, totally or partially free from the ovary
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flower: disc
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absent
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flower: perianth number
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2, 3, 4, 6
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flower: perianth nature
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perianth of similar segments, perianth of calyx and corolla
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flower: sepal number
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2, 3
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flower: sepal position
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all free from one another
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flower: sepal nature
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sepals valvate
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flower: petal number
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0, 2, 3, 4, 6
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flower: petal position
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all free from one another, petals imbricate
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flower: petal nature
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petals valvate
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stamen: number
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11+
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stamen: anthers
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basifixed, introrse, extrorse, opening by longitudinal slits, 1-locular at anthesis
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stamen: filaments
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free from the corolla, not connate
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stamen: other characters
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staminodia present
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pistil: style
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styles more than 1, free, style 1, or styles more or less connate
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pistil: carpel
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2, 3, 4, 5, 6+
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pistil: ovary
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1-locular
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pistil: ovule
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3+ in each loculus
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pistil
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ovules parietal, carpels connate
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fruit: type
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a capsule, a nut, fleshy
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fruit: seed
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3+ seeds
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seed: embryo
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straight
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seed: endosperm
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seeds without endosperm
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