Xyris bicephala

Primary tabs

Xyris bicephala

Content

<<<<<Scapes>Spikes>Bracts>Floral bracts>Shape>Colour

red1
1. 003-004-005-003-001-002

<<<<<Scapes>Spikes>Bracts>Floral bracts>Shape>Length

5-8 mm2
2. 003-004-005-003-001-001

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

several3
3. 003-004-005-002-001

<<<<Scapes>Spikes>Bracts>Floral bracts>Shape

broadly ovate-elliptic to oblong, , rounded, entire to finely lacerate, rarely -ciliolate, ecarinate, uniform or with indistinct dorsal area4
4. 003-004-005-003-001

<<<Capsules>Seeds>Scales>Colour

pale5
5. 005-004-004-001

<<<Lateral sepals>Keel>Hairs>Colour

red6
6. 004-002-001-001

<<<Leaves>Margins>Hairs>Colour

white7
7. 002-003-001-001

<<<Scapes>Margins>Hairs>Colour

white8
8. 003-003-001-001

<<<Scapes>Spikes>Bracts>Empty bracts

empty ones , grading into the larger floral ones9
9. 003-004-005-002

<<<Scapes>Spikes>Bracts>Floral bracts

these10
10. 003-004-005-003

<<<Scapes>Spikes>Bracts>Shape

subdecussate11
11. 003-004-005-001

<<Capsules>Seeds>Length

2.5-3 mm long12
12. 005-004-003

<<Capsules>Seeds>Scales

including long apical scale13
13. 005-004-004

<<Capsules>Seeds>Seed number

few14
14. 005-004-001

<<Capsules>Seeds>Shape

cylindric-fusiform15
15. 005-004-002

<<Capsules>Valves>Septa

septate at base16
16. 005-003-001

<<Habit>Leaf bases>Colour

castaneous to nearly black17
17. 001-003-001

<<Habit>Stems>Shape

short to elongate, encased in fans of closely imbricate18
18. 001-002-001

<<Habit>Stems>Texture

stiff19
19. 001-002-002

<<Lateral sepals>Anthers>Length

ca. 2 mm20
20. 004-005-001

<<Lateral sepals>Keel>Hairs

distally -ciliolate to fimbriolate21
21. 004-002-001

<<Lateral sepals>Petals>Length

5.5-6 mm22
22. 004-003-002

<<Lateral sepals>Petals>Shape

obovate23
23. 004-003-001

<<Lateral sepals>Staminodes>Shape

bearded24
24. 004-004-001

<<Leaves>Blade>Shape

flattened25
25. 002-002-001

<<Leaves>Blade>Width

5-10 mm wide26
26. 002-002-002

<<Leaves>Margins>Hairs

densely -ciliate27
27. 002-003-001

<<Scapes>Margins>Hairs

densely -ciliate28
28. 003-003-001

<<Scapes>Spikes>Bracts

bracts , , .29
29. 003-004-005

<<Scapes>Spikes>Colour

deep brown to castaneous30
30. 003-004-004

<<Scapes>Spikes>Length

0.8-1.5 cm31
31. 003-004-003

<<Scapes>Spikes>Shape

broadly ovoid to subglobose32
32. 003-004-002

<<Scapes>Spikes>Spike number

mostly 233
33. 003-004-001

<Capsules>Length

4-4.5 mm34
34. 005-001

<Capsules>Placentation

placentation basal-axile35
35. 005-002

<Capsules>Seeds

seeds , , , .36
36. 005-004

<Capsules>Valves

valves ;37
37. 005-003

<Habit>Height

25-100 cm high38
38. 001-001

<Habit>Leaf bases

leaf bases39
39. 001-003

<Habit>Stems

stems ,40
40. 001-002

<Lateral sepals>Anthers

anthers .41
41. 004-005

<Lateral sepals>Keel

keel42
42. 004-002

<Lateral sepals>Length

5.5-6.6 mm43
43. 004-001

<Lateral sepals>Petals

petals ;44
44. 004-003

<Lateral sepals>Staminodes

staminodes ;45
45. 004-004

<Leaves>Blade

blade , ,46
46. 002-002

<Leaves>Length

20-50 cm47
47. 002-001

<Leaves>Margins

margins .48
48. 002-003

<Scapes>Margins

margins ;49
49. 003-003

<Scapes>Shape

distally flattened50
50. 003-001

<Scapes>Spikes

spikes , , , ,51
51. 003-004

<Scapes>Width

2.5-4 mm wide52
52. 003-002

Capsules

Capsule , ,53
53. 005

Description

Smooth, cespitose perennial, 25-100 cm high, stems short to elongate, encased in fans of closely imbricate, stiff, castaneous to nearly black leaf bases. Leaves 20-50 cm, blade flattened, 5-10 mm wide, margins densely white-ciliate. Scapes distally flattened, 2.5-4 mm wide, margins densely white-ciliate; spikes mostly 2, broadly ovoid to subglobose, 0.8-1.5 cm, deep brown to castaneous, bracts subdecussate, empty ones several, grading into the larger floral ones, these broadly ovate-elliptic to oblong, 5-8 mm, rounded, entire to finely lacerate, rarely red-ciliolate, ecarinate, uniform or with indistinct dorsal area. Lateral sepals free, equilateral, narrow, 5.5-6.6 mm, keel distally red-ciliolate to fimbriolate; petals obovate5.5-6 mm; staminodes bearded; anthers ca. 2 mm. Capsule 4-4.5 mm, placentation basal-axile, valves septate at base; seeds few, cylindric-fusiform, 2.5-3 mm long, including long pale apical scale.

Distribution

Bolivar present, E to SE Guyana present, Gran Sabana present, Southern America: Brazil North (Roraima present)
Gran Sabana of BolivarE to SE Guyana in boggy savanna over Roraima Sandstone, 800-2400 m.

Habit

Smooth, cespitose perennial, , , .54
54. 001

Individuals Association

Guyana, Pakaraima Mts., savanna, Chenowieng to Chi-Chi Landing, Maguire et al. 40643A

Lateral sepals

Lateral sepals free, equilateral, narrow, , ;55
55. 004

Leaves

Leaves ,56
56. 002

Notes

This distinctive species makes up one of the commoner elements in the bogs of the Gran Sabana of Bolivar, Venezuela, and may be more abundant in that part of Guyana on and near Mt. Roraima than present records indicate.

Scapes

Scapes , ,57
57. 003