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Hansen & Rahn
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Family List
Hydrostachyaceae
Engler
habit
herbaceous plants
important diagnostics
aquatic plants, leaves floating or submerged
distribution
African
leaf: position
alternate
leaf: nature
not compound
leaf: venation
pinnate or hardly visible in leaves or leaflets.
margin
lobed or divided
leaf: stipules
absent, present
inflorescence
spike
flower: sexuality
unisexual
flower: symmetry
actinomorphic
flower: receptacle
small
flower: disc
absent
flower: perianth number
0
flower: sepal number
0
flower: petal number
0
stamen: number
1
stamen: anthers
dorsifixed or ventrifixed, extrorse, opening by longitudinal slits
stamen: filaments
free from the corolla, not connate
pistil: style
styles more than 1, free
pistil: carpel
2
pistil: ovary
1-locular
pistil: ovule
3+ in each loculus
pistil
ovules parietal, carpels connate
fruit: type
a capsule
fruit: seed
3+ seeds
seed: embryo
straight
seed: endosperm
seeds without endosperm
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