Sagittaria

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Sagittaria

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<<<Flowers>Gynoecium>Carpels>Ovule number

1-ovuled1
1. 006-004-001-001

<<<Flowers>Stamens>Anthers>Shape

linear to orbicular2
2. 006-003-003-001

<<<Flowers>Stamens>Filaments>Hairs

glabrous to pubescent3
3. 006-003-002-002

<<<Flowers>Stamens>Filaments>Shape

linear to dilated4
4. 006-003-002-001

<<<Stems>Rhizome>Tuber>Colour

brown5
5. 003-001-001-001

<<Flowers>Gynoecium>Carpels

carpels6
6. 006-004-001

<<Flowers>Petals>Colour

white or rarely with a pink to purple spot or tinge7
7. 006-002-001

<<Flowers>Sepals>Texture

coriaceous8
8. 006-001-001

<<Flowers>Stamens>Anthers

anthers basifixed, ;9
9. 006-003-003

<<Flowers>Stamens>Filaments

filaments , ,10
10. 006-003-002

<<Flowers>Stamens>Stamen number

7-many11
11. 006-003-001

<<Flowers>Style>Position

terminal12
12. 006-005-001

<<Inflorescences>Bracts>Shape

obtuse to acute13
13. 005-003-001

<<Inflorescences>Pedicels>Growth form

recurved14
14. 005-004-001

<<Leaves>Petiole>Shape

terete to triangular, blades present or absent, linear to rhombiform to sagittate15
15. 004-001-001

<<Stems>Rhizome>Tuber

tubers , smooth16
16. 003-001-001

<Flowers>Gynoecium

gynoecium of many carpels, ,17
17. 006-004

<Flowers>Petals

petals ;18
18. 006-002

<Flowers>Sepals

sepals herbaceous to , often sculptured, reflexed in staminate flowers, reflexed to appressed in carpellate flowers;19
19. 006-001

<Flowers>Stamens

stamens ,20
20. 006-003

<Flowers>Style

styles .21
21. 006-005

<Inflorescences>Bracts

bracts coarse or delicate, smooth to papillose, ;22
22. 005-003

<Inflorescences>Carpellate flowers

carpellate flowers in lower part of inflorescences, staminate flowers above.23
23. 005-005

<Inflorescences>Growth form

erect24
24. 005-001

<Inflorescences>Pedicels

pedicels elongating after anthesis, ascending to ;25
25. 005-004

<Inflorescences>Whorl number

1-1726
26. 005-002

<Leaves>Petiole

petioles27
27. 004-001

<Plant sexuality>Hairs

glabrous to sparsely pubescent28
28. 001-001

<Stems>Rhizome

rhizomes occasionally terminated by tubers,29
29. 003-001

Akenes

Achenes compressed, with a conspicuous dorsal wing, not ribbed, glandular.30
30. 007

Description

Plants monoecious, perennial or rarely annual, glabrous to sparsely pubescent, growing submersed, floating-leaved, or emerged in fresh or brackish waters. Roots septate. Stems often with rhizomes; rhizomes occasionally terminated by tubers, tubers brown, smoothLeaves submersed, floating, or emerged, sessile or petiolate, petioles terete to triangular, blades present or absent, linear to rhombiform to sagittate, without pellucid markings. Inflorescences erect, racemose or paniculate scapes, emerged or floating, rarely submersed, whorls 1-17, each whorl with 2-3 flowers; bracts coarse or delicate, smooth to papillose, obtuse to acute; pedicels elongating after anthesis, ascending to recurved; carpellate flowers in lower part of inflorescences, staminate flowers above. Flowers unisexual, rarely lower ones with a ring of sterile stamens, pedicellate; sepals herbaceous to coriaceous, often sculptured, reflexed in staminate flowers, reflexed to appressed in carpellate flowers; petals white or rarely with a pink to purple spot or tinge; stamens 7-many, filaments linear to dilated, glabrous to pubescent, anthers basifixed, linear to orbicular; gynoecium of many carpels, carpels 1-ovuled, styles terminal. Achenes compressed, with a conspicuous dorsal wing, not ribbed, glandular.

Distribution

Argentina present, Asia present, Canada present, Chile present, Guianas present, predominently Western Hemisphere present
A predominently Western Hemisphere genus of ca. 20 species, from Canada S to Argentina and Chile; 3 or 4 species also occur in Europe and Asia; 3 species in the Guianas.

Flowers

Flowers unisexual, rarely lower ones with a ring of sterile stamens, pedicellate;31
31. 006

Inflorescences

Inflorescences , racemose or paniculate scapes, emerged or floating, rarely submersed, whorls , each whorl with 2-3 flowers;32
32. 005

Leaves

Leaves submersed, floating, or emerged, sessile or petiolate, , without pellucid markings.33
33. 004

Notes

Bogin (1955) combined Sagittaria and Lophotocarpus, recognizing 2 subgenera:
  • subgenus Sagittaria: ascending to reflexed sepals and mostly spreading to ascending pedicels in fruit, and all flowers unisexual.
  • subgenus Lophotocarpus: appressed sepals and recurved pedicels in fruit, and upper flowers bisexual.

Plant sexuality

Plants monoecious, perennial or rarely annual, , growing submersed, floating-leaved, or emerged in fresh or brackish waters.34
34. 001

Roots

Roots septate.35
35. 002

Stems

Stems often with rhizomes;36
36. 003