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Hansen & Rahn | Family List

Hydrocharitaceae A. L. de Jussieu

habit
herbaceous plants

important diagnostics
aquatic plants, leaves floating or submerged, spiny stems or leaves

distribution
African, Asian, Australian and Oceanian, European, North American, South American

leaf: position
opposite or verticillate, alternate, distichous

leaf: nature
not compound

leaf: venation
pinnate or hardly visible in leaves or leaflets., invisible or leaves 1-nerved, longitudinal in leaves or leaflets

margin
with entire margin, dentate

leaf: stipules
absent, present

inflorescence
solitary, raceme, umbel, simple, sympodial

flower: sexuality
bisexual, unisexual

flower: symmetry
actinomorphic, zygomorphic or irregular

flower: receptacle
enlarged, totally or partially free from the ovary

flower: disc
absent

flower: perianth number
2, 3, 4, 6

flower: perianth nature
perianth of similar segments, perianth of calyx and corolla

flower: sepal number
2, 3

flower: sepal position
all free from one another

flower: sepal nature
sepals valvate

flower: petal number
0, 2, 3, 4, 6

flower: petal position
all free from one another, petals imbricate

flower: petal nature
petals valvate

stamen: number
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11+

stamen: anthers
basifixed, introrse, extrorse, opening by longitudinal slits, 1-locular at anthesis

stamen: filaments
free from the corolla, not connate

stamen: other characters
staminodia present

pistil: style
styles more than 1, free, style 1, or styles more or less connate

pistil: carpel
2, 3, 4, 5, 6+

pistil: ovary
1-locular

pistil: ovule
3+ in each loculus

pistil
ovules parietal, carpels connate

fruit: type
a capsule, a nut, fleshy

fruit: seed
3+ seeds

seed: embryo
straight

seed: endosperm
seeds without endosperm


 

Related Objects  

Flora of China  
  • Hydrocharitaceae (PDF)
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