PlantNET Home PlantNET Home | Search NSW Flora | Contact Us  
FloraOnline
Introduction
Plant Name Search
Index Search
Spatial Search
Identification Keys
Classification
Glossary
HerbLink (Type Images)
WeedAlert
Other PlantNET Sites
Other Data Sources
NEW SOUTH WALES FLORA ONLINE Printable Page

Family PONTEDERIACEAE

Description: Annual or perennial, free-floating, rhizomatous or stoloniferous aquatic herbs.

Leaves alternate, sheathed, often stipulate, often with a petiole-like stalk between the sheath and the expanded blade; blade hair-like to circular, base cuneate to cordate.

Inflorescence spike-like, paniculate or flowers solitary, subtended by 2 spathes. Flowers bisexual, sometimes heterostylous, actinomorphic or zygomorphic. Perianth lobes usually 6, variously fused, petaloid, white, blue or yellow. Stamens 6, 3 or 1, similar or dissimilar, inserted on perianth; anthers 2-locular, introrse, dehiscing by longitudinal slits or rarely apical pores. Ovary superior, 3-locular though sometimes only 1 fertile; style 1.

Fruit a capsule or 1-seeded nutlet; seeds numerous or solitary.


Distribution and occurrence: World: 9 genera, c. 40 species, America, Africa, Asia, Australia. Australia: 3 genera, 6 species, all mainland States.

External links:
Angiosperm Phylogeny Website (Family: Pontederiaceae, Order: Commelinales)
Wikipedia

Text by S. W. L. Jacobs
Taxon concept:

Taxa not yet included in identification key
Heteranthera

 Key to the genera 
1Plants mostly free-floating; flowers more than 3 cm acrossEichhornia
Plants mostly rooted; flowers, less than 3 cm across2
2Fruit 3-locular with many seeds; perianth free almost to baseMonochoria
Fruit a 1-seeded nutlet; perianth fused for half its length, 2-lipped, the upper lip with 3 lobes fused for about half their length, the lower lip with 3 lobes almost free from each other
                       Back to 1
Pontederia

  Privacy | Copyright | Disclaimer | About PlantNET | Cite PlantNET