Petiveria

<<<Flowers>Ovary>Awns>Awn number

4-61

1. 004-003-004-001

<<<Flowers>Ovary>Ovules>Ovule number

12

2. 004-003-005-001

<<<Flowers>Ovary>Stigma>Shape

penicillate and laterally decurrent along ventral (flattened) side of ovary3

3. 004-003-007-002

<<<Flowers>Ovary>Stigma>Stigma number

14

4. 004-003-007-001

<<<Flowers>Stamens>Anthers>Shape

linear5

5. 004-002-003-001

<<<Flowers>Tepals>Lobes>Growth form

spreading in flower, persistent, enlarging and erect in fruit6

6. 004-001-002-001

<<<Fruits>Seeds>Testa>Position

adherent to pericarp7

7. 005-003-003-002

<<<Fruits>Seeds>Testa>Texture

membranous8

8. 005-003-003-001

<<Flowers>Ovary>Awns

with retrorse hook-like awns9

9. 004-003-004

<<Flowers>Ovary>Hairs

pilose or tomentose10

10. 004-003-003

<<Flowers>Ovary>Locule number

1-loculed11

11. 004-003-001

<<Flowers>Ovary>Ovules

ovule ,12

12. 004-003-005

<<Flowers>Ovary>Shape

narrowly subellipsoid or oblongoid, flattened13

13. 004-003-002

<<Flowers>Ovary>Stigma

stigma , papillose, .14

14. 004-003-007

<<Flowers>Ovary>Style

style absent,15

15. 004-003-006

<<Flowers>Stamens>Anthers

anthers seemingly medifixed, ;16

16. 004-002-003

<<Flowers>Stamens>Filaments

filaments unequal, shorter than tepals,17

17. 004-002-002

<<Flowers>Stamens>Stamen number

4-818

18. 004-002-001

<<Flowers>Tepals>Lobes

lobes ;19

19. 004-001-002

<<Flowers>Tepals>Tepal number

420

20. 004-001-001

<<Fruits>Awns>Awn number

4-621

21. 005-002-001

<<Fruits>Seeds>Albumen

albumen scanty, mealy,22

22. 005-003-004

<<Fruits>Seeds>Cotyledons

cotyledons foliaceous.23

23. 005-003-005

<<Fruits>Seeds>Seed number

124

24. 005-003-001

<<Fruits>Seeds>Shape

linear25

25. 005-003-002

<<Fruits>Seeds>Testa

testa , ,26

26. 005-003-003

<Flowers>Ovary

ovary , , , ,27

27. 004-003

<Flowers>Stamens

stamens , on a hypogynous disk,28

28. 004-002

<Flowers>Tepals

tepals , free or partly united in a short tube,29

29. 004-001

<Fruits>Awns

with apical hooked awns30

30. 005-002

<Fruits>Lobe number

2-lobed31

31. 005-001

<Fruits>Seeds

seed , ,32

32. 005-003

<Inflorescences>Bracts

bracteate and bracteolate.33

33. 003-003

<Inflorescences>Flowers

flowers subsessile or pedicellate;34

34. 003-002

<Inflorescences>Position

axillary or terminal35

35. 003-001

<Leaves>Stipules

stipules present, minute.36

36. 002-001

Description

Herbs or subshrubs, slightly woody at base. Leaves shortly petiolate; stipules present, minute. Inflorescences elongated, axillary or terminal spike-like racemes; flowers subsessile or pedicellate; bracteate and bracteolate. Flowers bisexual, more or less actinomorphic; tepals 4, free or partly united in a short tube, lobes spreading in flower, persistent, enlarging and erect in fruit; stamens 4-8, on a hypogynous disk, filaments unequal, shorter than tepals, anthers seemingly medifixed, linear; ovary 1-loculed, narrowly subellipsoid or oblongoid, flattened, pilose or tomentose, with 4-6 retrorse hook-like awns, ovule 1, style absent, stigma 1, papillose, penicillate and laterally decurrent along ventral (flattened) side of ovary. Fruits 2-lobed achenes with 4-6 apical hooked awns; seed 1, linear, testa membranous, adherent to pericarp, albumen scanty, mealy, cotyledons foliaceous.

Distribution

Central and South America present, Guianas present, Southern America, United States present, tropical and subtropical America present

Species 2, occurring in tropical and subtropical America; 1 species (with 6 fruit-awns) endemic to Brazil, the other (with usually 4 fruit-awns) occurring in the United States, West Indies, Central and South America, including the Guianas.

Flowers

Flowers bisexual, more or less actinomorphic;37

37. 004

Fruits

Fruits achenes ;38

38. 005

Habit

Herbs or subshrubs, slightly woody at base.39

39. 001

Inflorescences

Inflorescences elongated, spike-like racemes;40

40. 003

Leaves

Leaves shortly petiolate;41

41. 002

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