Xyris subuniflora

<<<<Leaves>Sheaths>Base>Ligula>Length

to 1 mm1

1. 002-003-002-002-001

<<<<Scapes>Spikes>Bracts>Empty bracts>Bract number

usually 42

2. 003-002-003-001-001

<<<<Scapes>Spikes>Bracts>Empty bracts>Shape

triangular-oblong3

3. 003-002-003-001-002

<<<<Scapes>Spikes>Bracts>Fertile bracts>Length

ca. 4 mm4

4. 003-002-003-002-002

<<<<Scapes>Spikes>Bracts>Fertile bracts>Shape

oblong to ovate5

5. 003-002-003-002-001

<<<Lateral sepals>Lobes>Keel>Texture

smooth6

6. 004-003-002-001

<<<Leaves>Sheaths>Base>Colour

tan or pink7

7. 002-003-002-001

<<<Leaves>Sheaths>Base>Ligula

eligulate or with ligule8

8. 002-003-002-002

<<<Leaves>Sheaths>Blade>Shape

filiform, flattened9

9. 002-003-003-001

<<<Leaves>Sheaths>Blade>Width

0.3-0.5 mm wide10

10. 002-003-003-002

<<<Leaves>Sheaths>Margins>Margin type

entire11

11. 002-003-004-001

<<<Leaves>Sheaths>Surfaces>Colour

maroon or olive12

12. 002-003-005-001

<<<Scapes>Spikes>Bracts>Empty bracts

the empty ones , , slightly shorter than the fertile one13

13. 003-002-003-001

<<<Scapes>Spikes>Bracts>Fertile bracts

this , conduplicate,14

14. 003-002-003-002

<<Capsules>Seeds>Colour

brown, opaque15

15. 005-004-004

<<Capsules>Seeds>Length

0.5-0.6 mm16

16. 005-004-003

<<Capsules>Seeds>Seed number

few17

17. 005-004-001

<<Capsules>Seeds>Shape

broadly ellipsoid18

18. 005-004-002

<<Capsules>Valves>Septa

eseptate19

19. 005-003-001

<<Lateral sepals>Anthers>Length

ca. 0.8 mm20

20. 004-006-001

<<Lateral sepals>Lobes>Keel

keel21

21. 004-003-002

<<Lateral sepals>Lobes>Shape

narrowly triangular22

22. 004-003-001

<<Lateral sepals>Petals>Length

ca. 3 mm23

23. 004-004-002

<<Lateral sepals>Petals>Shape

obovate24

24. 004-004-001

<<Lateral sepals>Shape>Relative distance

1/225

25. 004-001-001

<<Lateral sepals>Staminodes>Shape

bearded26

26. 004-005-001

<<Leaves>Sheaths>Base

base keeled, , ,27

27. 002-003-002

<<Leaves>Sheaths>Blade

blade , ,28

28. 002-003-003

<<Leaves>Sheaths>Hairs

eciliate29

29. 002-003-001

<<Leaves>Sheaths>Margins

margins ,30

30. 002-003-004

<<Leaves>Sheaths>Surfaces

surface .31

31. 002-003-005

<<Scapes>Shape>Ribs

ribless32

32. 003-001-002

<<Scapes>Shape>Thickness

ca. 0.3 mm thick33

33. 003-001-001

<<Scapes>Spikes>Bracts

bracts few, all but one empty, all with distinct dorsal area, , .34

34. 003-002-003

<<Scapes>Spikes>Length

4-5 mm35

35. 003-002-002

<<Scapes>Spikes>Shape

narrowly ellipsoid, becoming lance-ovoid36

36. 003-002-001

<Capsules>Length

ca. 1.5 mm37

37. 005-001

<Capsules>Placentation

placentation basal38

38. 005-002

<Capsules>Seeds

seeds , , , .39

39. 005-004

<Capsules>Valves

valves ;40

40. 005-003

<Habit>Height

to 10 cm high41

41. 001-002

<Habit>Stems

stems short42

42. 001-003

<Habit>Texture

smooth43

43. 001-001

<Lateral sepals>Anthers

anthers .44

44. 004-006

<Lateral sepals>Length

3-3.5 mm45

45. 004-002

<Lateral sepals>Lobes

lobes , ;46

46. 004-003

<Lateral sepals>Petals

petals , ;47

47. 004-004

<Lateral sepals>Shape

connate48

48. 004-001

<Lateral sepals>Staminodes

staminodes ;49

49. 004-005

<Leaves>Growth form

erect or in fans50

50. 002-001

<Leaves>Length

1-7 cm51

51. 002-002

<Leaves>Sheaths

sheath , soft,52

52. 002-003

<Scapes>Shape

filiform, distally terete, , , finely striate53

53. 003-001

<Scapes>Spikes

spikes , ,54

54. 003-002

Capsules

Capsule , ,55

55. 005

Description

Low, delicate, densely cespitose, smooth, to 10 cm high, annual or short-lived perennial, stems short. Leaves erect or in fans, 1-7 cm; sheath eciliate, soft, base keeled, tan or pink, eligulate or with ligule to 1 mm, blade filiform, flattened, 0.3-0.5 mm wide, margins entire, surface maroon or olive. Scapes filiform, distally terete, ca. 0.3 mm thick, ribless, finely striate; spikes narrowly ellipsoid, becoming lance-ovoid, 4-5 mm, bracts few, all but one empty, all with distinct dorsal area, the empty ones usually 4, triangular-oblong, slightly shorter than the fertile one, this oblong to ovate, conduplicate, ca. 4 mm. Lateral sepals 1/2 connate, 3-3.5 mm, lobes narrowly triangular, keel smooth; petals obovate, ca. 3 mm; staminodes bearded; anthers ca. 0.8 mm. Capsule ca. 1.5 mm, placentation basal, valves eseptate; seeds few, broadly ellipsoid, 0.5-0.6 mm, brown, opaque.

Distribution

Amazonian Brazil present, S Venezuela present, SE Colombia present, Southern America: Brazil North (Amazonas present, Roraima present), Suriname present

SE Colombia E across S Venezuela to Suriname; Amazonian Brazil (Amazonas, Thrr. Roraima).

Habit

Low, delicate, densely cespitose, , , annual or short-lived perennial, .56

56. 001

Individuals Association

Suriname, Bronniveau, Natuurreservaat Brinckheu- vel, Teunissen & Wildschut LBB ll910 Suriname, ridge E of camp 14.9 km, Moengo tapoe ad Grote Zwiebelzwamp, Lanjouw & Lindeman 729 Guyana, Kaieteur Savanna, N.Y. Sandwith 1373 Suriname, prope Jodensavanne, SurinameR., Heyligers 347

Lateral sepals

Lateral sepals , ,57

57. 004

Leaves

Leaves , ;58

58. 002

Notes

Perhaps the smallest, certainly the most slender species of Xyris, very easily overlooked among the masses of other small xyrids of open savanna.

Scapes

Scapes ;59

59. 003

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