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Hansen & Rahn | Family List

Araceae Juss.

habit
woody plants, herbaceous plants

important diagnostics
aquatic plants, leaves floating or submerged, milky juice present, spiny stems or leaves

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

leaf: position
alternate, distichous, ensiform

leaf: nature
not compound, compound, pinnately compound, ternately compound, palmately compound

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

margin
with entire margin, lobed or divided, dentate

leaf: stipules
absent

inflorescence
spike

flower: sexuality
bisexual, unisexual

flower: symmetry
actinomorphic

flower: receptacle
small

flower: disc
absent

flower: perianth number
0, 4, 5, 6, 7+

flower: perianth nature
perianth of similar segments

flower: sepal number
0, 4, 5, 6+

flower: sepal position
all free from one another, connate

flower: sepal nature
sepals imbricate or contorted

flower: petal number
0, 4, 5, 6, 7, 8, 9

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

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

stamen: symmetry
the same number as and opposite the petals or alternate with the sepals

stamen: anthers
basifixed, introrse, extrorse, opening by longitudinal slits, opening by apical pores

stamen: filaments
free from the corolla, not connate, connate into 1 tube or bundle

stamen: other characters
anthers with a conspicuous appendage

pistil: style
styles absent, stigmas sessile, style 1, or styles more or less connate

pistil: carpel
1, 2, 3, 4, 5, 6+

pistil: ovary
1-locular, 2-locular, 3-locular, 4-locular, 5-locular, 6+ locules

pistil: ovule
1 in each loculus, 2 in each loculus, 3+ in each loculus

pistil
carpels free from each other or carpel 1, ovules parietal, carpels connate, ovules axile, carpels connate, ovules attached to the central axis or ventrally in apocarpae, ovules attached to the apex of the ovary, ovules attached to the base of the ovary

fruit: type
a nut, fleshy

fruit: seed
1 seed, 2 seeds, 3+ seeds

seed: embryo
straight, curved

seed: endosperm
seeds without endosperm, seeds with endosperm


 

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