Xyris thysanolepis

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Xyris thysanolepis

Content

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

6-8 mm1
1. 003-004-003-004-001-001

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

few2
2. 003-004-003-003-001

<<<<Scapes>Spikes>Bracts>Flowering bracts>Shape

broadly oblong to obovate, , back convex or somewhat keeled near apex3
3. 003-004-003-004-001

<<<<Scapes>Spikes>Bracts>Shape>Colour

red-bordered4
4. 003-004-003-002-001

<<<Scapes>Spikes>Bracts>Colour

red-brown5
5. 003-004-003-001

<<<Scapes>Spikes>Bracts>Empty bracts

empty bracts , smaller than and grading upward into the flowering ones6
6. 003-004-003-003

<<<Scapes>Spikes>Bracts>Flowering bracts

these7
7. 003-004-003-004

<<<Scapes>Spikes>Bracts>Shape

without distinct dorsal area but broadly and friably8
8. 003-004-003-002

<<Capsules>Seeds>Colour

amber9
9. 005-004-004

<<Capsules>Seeds>Length

ca. 1 mm10
10. 005-004-003

<<Capsules>Seeds>Seed number

numerous11
11. 005-004-001

<<Capsules>Seeds>Shape

cylindric-fusiform12
12. 005-004-002

<<Capsules>Valves>Septa

eseptate13
13. 005-003-001

<<Habit>Stems>Length

to 6 cm14
14. 001-002-002

<<Habit>Stems>Shape

short or elongate15
15. 001-002-001

<<Lateral sepals>Anthers>Length

1.5-2 mm16
16. 004-006-001

<<Lateral sepals>Keel>Hairs

rusty-ciliolate to low-serrulate-lacerate from about middle to apex17
17. 004-003-001

<<Lateral sepals>Petals>Length

4-5 mm18
18. 004-004-002

<<Lateral sepals>Petals>Shape

elliptic to obovate19
19. 004-004-001

<<Lateral sepals>Shape>Relative distance

up to 1/320
20. 004-001-001

<<Lateral sepals>Staminodes>Shape

bearded21
21. 004-005-001

<<Leaves>Blade>Shape

strongly flattened22
22. 002-005-001

<<Leaves>Blade>Width

2-5 mm wide23
23. 002-005-002

<<Leaves>Keel>Hairs

smooth to ciliolate24
24. 002-004-001

<<Leaves>Margins>Hairs

ciliolate25
25. 002-006-002

<<Leaves>Margins>Margin type

entire26
26. 002-006-001

<<Leaves>Sheaths>Colour

tan to castaneous, upwards pink, brown or stramineous27
27. 002-003-002

<<Leaves>Sheaths>Hairs

ciliate or not28
28. 002-003-001

<<Leaves>Sheaths>Texture

smooth, eligulate29
29. 002-003-003

<<Scapes>Ribs>Hairs

ciliate to densely ciliolate30
30. 003-003-002

<<Scapes>Ribs>Rib number

1, 2 or more31
31. 003-003-001

<<Scapes>Ribs>Texture

-scabridulous, otherwise smooth32
32. 003-003-003

<<Scapes>Spikes>Bracts

bracts in a spiral, firm, , , , .33
33. 003-004-003

<<Scapes>Spikes>Length

0.7-1.3 cm34
34. 003-004-002

<<Scapes>Spikes>Shape

broadly ellipsoid becoming broadly obovoid to globose35
35. 003-004-001

<Capsules>Length

3.5-4 mm36
36. 005-001

<Capsules>Placentation

placentation basal37
37. 005-002

<Capsules>Seeds

seeds , , , .38
38. 005-004

<Capsules>Valves

valves ;39
39. 005-003

<Habit>Height

20-100 cm high40
40. 001-001

<Habit>Stems

stems41
41. 001-002

<Lateral sepals>Anthers

anthers .42
42. 004-006

<Lateral sepals>Keel

the narrow curved keel43
43. 004-003

<Lateral sepals>Length

6-7 mm44
44. 004-002

<Lateral sepals>Petals

petals , ;45
45. 004-004

<Lateral sepals>Shape

connate46
46. 004-001

<Lateral sepals>Staminodes

staminodes ;47
47. 004-005

<Leaves>Blade

blade , ,48
48. 002-005

<Leaves>Growth form

erect or in fans49
49. 002-001

<Leaves>Keel

keel50
50. 002-004

<Leaves>Length

10-30 cm51
51. 002-002

<Leaves>Margins

margins thin, or .52
52. 002-006

<Leaves>Sheaths

sheath , ,53
53. 002-003

<Scapes>Ribs

with ribs, one strong, often making an edge,54
54. 003-003

<Scapes>Shape

distally subterete or oval55
55. 003-001

<Scapes>Spikes

spikes , ,56
56. 003-004

<Scapes>Width

1-2 mm wide57
57. 003-002

Capsules

Capsule , ,58
58. 005

Description

Slender, solitary to cespitose, soft-to-firm-based, perennial, 20-100 cm high, stems short or elongateto 6 cm. Leaves erect or in fans, 10-30 cm, sheath ciliate or not, tan to castaneous, upwards pink, brown or stramineous, smooth, eligulate, keel smooth to ciliolate, blade strongly flattened, 2-5 mm wide, margins thin, entire or ciliolate. Scapes distally subterete or oval, 1-2 mm widewith 1, 2 or more ribs, one strong, often making an edge, ciliate to densely ciliolate-scabridulous, otherwise smooth; spikes broadly ellipsoid becoming broadly obovoid to globose, 0.7-1.3 cm, bracts in a spiral, firm, red-brown, without distinct dorsal area but broadly and friably red-bordered, empty bracts few, smaller than and grading upward into the flowering ones, these broadly oblong to obovate, 6-8 mm, back convex or somewhat keeled near apex. Lateral sepals up to 1/3 connate or some pairs free, subequilateral, 6-7 mm, the narrow curved keel rusty-ciliolate to low-serrulate-lacerate from about middle to apex; petals elliptic to obovate, 4-5 mm; staminodes bearded; anthers 1.5-2 mm. Capsule 3.5-4 mm, placentation basal, valves eseptate; seeds numerous, cylindric-fusiform, ca. 1 mm, amber.

Distribution

Guyana present, Mt. Roraima on the Venezuelan side present, S Amazonas present, S Bolivar present, Southern America: Venezuela (Venezuela present)
S Amazonas E through S Bolivar, Venezuela in medium- to high-elevation boggy savanna, particularly along small streams and in rocky flushes, and E (?) to Guyana. As some material has been collected within sight of Mt. Roraima on the Venezuelan side, it is likely that the species will be found on the Guyana side.

Habit

Slender, solitary to cespitose, soft-to-firm-based, perennial, , .59
59. 001

Lateral sepals

Lateral sepals or some pairs free, subequilateral, , ;60
60. 004

Leaves

Leaves , , , ,61
61. 002

Notes

X. thysanolepis is part of a complex now being considered to include an Andean species. At present, however, it is treated as having two varieties, both of which could be found in Guyana, thus both considered below:

Scapes

Scapes , ;62
62. 003