Pontederia

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Pontederia

<<<Flowers>Stamens>Anthers>Shape

ovoid to oblong1
1. 005-003-004-001

<<<Flowers>Stamens>Filaments>Hairs

glandular-pubescent2
2. 005-003-003-001

<<<Flowers>Tepals>Shape>Hairs

glandular-pubescent or pilose on adaxial surface3
3. 005-002-001-001

<<<Inflorescences>Peduncle>Spathe>Shape

folded with an acute apex4
4. 004-001-002-001

<<Flowers>Carpels>Carpel number

35
5. 005-004-001

<<Flowers>Carpels>Placentation

placentation basal6
6. 005-004-002

<<Flowers>Perianth>Shape

funnelform7
7. 005-001-001

<<Flowers>Stamens>Anthers

anthers ;8
8. 005-003-004

<<Flowers>Stamens>Filaments

filaments ,9
9. 005-003-003

<<Flowers>Stamens>Relative dimensions

the 3 upper ones shorter than the 3 lower ones10
10. 005-003-002

<<Flowers>Stamens>Stamen number

611
11. 005-003-001

<<Flowers>Tepals>Shape

oblong, , obtuse to acuminate at apex12
12. 005-002-001

<<Fruits>Seeds>Shape

ovoid13
13. 006-002-001

<<Fruits>Seeds>Texture

smooth14
14. 006-002-002

<<Inflorescences>Peduncle>Hairs

glandular-pubescent or pilose when emersed15
15. 004-001-001

<<Inflorescences>Peduncle>Spathe

subtending spathe16
16. 004-001-002

<<Sessile leaves>Petiolated leaves>Shape

cordate to reniform, thin or thickened, obtuse to acuminate at apex17
17. 003-002-001

<<Vegetative stems>Flowering stems>Hairs

glabrous18
18. 002-001-001

<<Vegetative stems>Flowering stems>Shape

slightly constricted just below first node19
19. 002-001-002

<Flowers>Carpels

carpels , but only one developing to maturity, containing a single ovule, ;20
20. 005-004

<Flowers>Perianth

with perianth21
21. 005-001

<Flowers>Stamens

stamens , ,22
22. 005-003

<Flowers>Style

tristylous or homostylous.23
23. 005-005

<Flowers>Tepals

the tepals evenly spaced around central axis, ;24
24. 005-002

<Fruits>Perianth

the perianth thickened, with spinulose longitudinal ridges;25
25. 006-001

<Fruits>Seeds

seed , .26
26. 006-002

<Inflorescences>Peduncle

the peduncle , .27
27. 004-001

<Sessile leaves>Petiolated leaves

petiolate leaves floating or emersed, .28
28. 003-002

<Sessile leaves>Shape

acuminate to acute at apex29
29. 003-001

<Vegetative stems>Flowering stems

flowering stem submersed or emersed, , .30
30. 002-001

Description

Annuals or perennials, rooting in mud. Vegetative stem submersed and growing to surface or short and growing in mud; flowering stem submersed or emersed, glabrous, slightly constricted just below first node. Sessile leaves submersed, forming a basal rosette, thin, acuminate to acute at apex; petiolate leaves floating or emersed, cordate to reniform, thin or thickened, obtuse to acuminate at apex. Inflorescence a spike, developing over several days, the peduncle glandular-pubescent or pilose when emersed, subtending spathe folded with an acute apex. Flowers with perianth funnelform, the tepals evenly spaced around central axis, oblong, glandular-pubescent or pilose on adaxial surface, obtuse to acuminate at apex; stamens 6, the 3 upper ones shorter than the 3 lower ones, filaments glandular-pubescent, anthers ovoid to oblong; carpels 3, but only one developing to maturity, containing a single ovule, placentation basal; tristylous or homostylous. Fruit a nutlet; the perianth thickened, with spinulose longitudinal ridges; seed ovoid, smooth.

Distribution

Guianas present, New World present
6 species native to the New World; 3 occur in the Guianas.

Flowers

Flowers ,31
31. 005

Fruits

Fruit a nutlet;32
32. 006

Habit

Annuals or perennials, rooting in mud.33
33. 001

Inflorescences

Inflorescence a spike, developing over several days,34
34. 004

Sessile leaves

Sessile leaves submersed, forming a basal rosette, thin, ;35
35. 003

Vegetative stems

Vegetative stem submersed and growing to surface or short and growing in mud;36
36. 002