Amaranthus hybridus

<<<<Inflorescences>Bracts>Midveins>Apex>Shape

subulate1

1. 003-003-002-002-001

<<<Female flowers>Tepals>Shape>Length

1.3-2.5 mm long2

2. 006-001-002-001

<<<Inflorescences>Bracts>Midveins>Apex

extending into a , spinulose apex3

3. 003-003-002-002

<<<Inflorescences>Bracts>Midveins>Colour

green4

4. 003-003-002-001

<<<Inflorescences>Bracts>Shape>Length

usually 3.5 mm or longer (-4.5 mm)5

5. 003-003-001-001

<<<Male flowers>Tepals>Shape>Length

1.3-3.0 mm long6

6. 005-001-002-001

<<<Petiole>Blade>Shape>Dimensions

2-10(-15) x 1-7(-10) cm7

7. 002-002-001-001

<<Female flowers>Style>Style number

(2)38

8. 006-002-001

<<Female flowers>Tepals>Growth form

spreading at maturity9

9. 006-001-003

<<Female flowers>Tepals>Shape

oblong, longest (outer) , acute10

10. 006-001-002

<<Female flowers>Tepals>Tepal number

511

11. 006-001-001

<<Habit>Indumentum>Colour

white12

12. 001-003-001

<<Habit>Stems>Colour

green to red13

13. 001-002-001

<<Inflorescences>Bracts>Midveins

elongated with midvein , conspicuously exceeding tepals so that whole inflorescence often appears bristly14

14. 003-003-002

<<Inflorescences>Bracts>Shape

lanceolate or ovate,15

15. 003-003-001

<<Male flowers>Stamens>Stamen number

516

16. 005-002-001

<<Male flowers>Tepals>Shape

narrowly oblong or ovate, , acute17

17. 005-001-002

<<Male flowers>Tepals>Tepal number

518

18. 005-001-001

<<Petiole>Blade>Margin type

entire or minutely crenulate19

19. 002-002-002

<<Petiole>Blade>Shape

subelliptical, ovate, rhombic-ovate or lance-ovate, , obtuse or acute, slightly notched at apex20

20. 002-002-001

<<Utricles>Seeds>Colour

dark reddish-brown or black, lustrous21

21. 007-004-003

<<Utricles>Seeds>Dimensions

0.8-1.1 x 0.9-1.3 mm22

22. 007-004-002

<<Utricles>Seeds>Shape

lenticular or cochleate-orbicular23

23. 007-004-001

<Female flowers>Style

styles .24

24. 006-002

<Female flowers>Tepals

tepals , unequal, , , shorter than utricle;25

25. 006-001

<Flowers>Colour

green, white or reddish26

26. 004-001

<Habit>Height

to 2.5 m, often smaller27

27. 001-001

<Habit>Indumentum

indument of stems, young leaves and inflorescence axes more or less densely pubescent with tangled hairs or sometimes glabrous.28

28. 001-003

<Habit>Stems

stems ;29

29. 001-002

<Inflorescences>Bracts

bracts , .30

30. 003-003

<Inflorescences>Length

1-20 cm long31

31. 003-002

<Inflorescences>Position

axillary and terminal32

32. 003-001

<Male flowers>Stamens

stamens .33

33. 005-002

<Male flowers>Tepals

tepals , unequal, ;34

34. 005-001

<Petiole>Blade

blade , .35

35. 002-002

<Petiole>Length

to 3(-12) cm long36

36. 002-001

<Utricles>Length

2.0-2.5 mm long37

37. 007-002

<Utricles>Seeds

seed , , .38

38. 007-004

<Utricles>Shape

circumscissile, subglobose39

39. 007-001

<Utricles>Texture

slightly to conspicuously rugulose40

40. 007-003

Description

Annual, monoecious (or sometimes flowers bisexual), robust herb to 2.5 m, often smaller; stems green to red; indument of stems, young leaves and inflorescence axes more or less densely pubescent with tangled white hairs or sometimes glabrous. Petiole to 3(-12) cm long; blade subelliptical, ovate, rhombic-ovate or lance-ovate, 2-10(-15) x 1-7(-10) cm, obtuse or acute, slightly notched at apex, entire or minutely crenulate. Inflorescence of large axillary and terminal spikes or panicles 1-20 cm long; bracts lanceolate or ovate, usually 3.5 mm or longer (-4.5 mm), elongated with green midvein extending into a subulate, spinulose apex, conspicuously exceeding tepals so that whole inflorescence often appears bristly. Flowers green, white or reddish. Male flowers occurring in most parts of inflorescence; tepals 5, unequal, narrowly oblong or ovate, 1.3-3.0 mm long, acute; stamens 5. Female flowers, tepals 5, unequal, oblong, longest (outer) 1.3-2.5 mm long, acute, spreading at maturity, shorter than utricle; styles (2)3. Utricle circumscissile, subglobose, 2.0-2.5 mm long, slightly to conspicuously rugulose; seed lenticular or cochleate-orbicular, 0.8-1.1 x 0.9-1.3 mm, dark reddish-brown or black, lustrous.

Distribution

Guianas present, New World present, Southern America, eastern North America present

Origin in the New World (eastern North America to northern South America); weed of disturbed land in the Guianas; 14 collections studied, 2 from the Guianas (SU: 1; FG: 1).

Female flowers

Female flowers,41

41. 006

Flowers

Flowers .42

42. 004

Habit

Annual, monoecious (or sometimes flowers bisexual), robust herb ;43

43. 001

Individuals Association

Suriname, Berthoud-Coulon 536 Ile de Cayenne, Plateau du Mahury, a proximite du lac Rorota, de Granville 5776

Inflorescences

Inflorescence of large spikes or panicles ;44

44. 003

Male flowers

Male flowers occurring in most parts of inflorescence;45

45. 005

Petiole

Petiole ;46

46. 002

Utricles

Utricle , , ;47

47. 007

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