Phenax

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Phenax

<<Pistillate flowers>Stigma>Shape

filiform1
1. 005-002-001

<<Staminate flowers>Stamens>Stamen number

42
2. 004-002-001

<<Staminate flowers>Tepals>Shape

connate3
3. 004-001-002

<<Staminate flowers>Tepals>Tepal number

44
4. 004-001-001

<Habit>Hairs

without stinging hairs5
5. 001-001

<Leaves>Blade

blade pinnately veined.6
6. 002-002

<Leaves>Stipules

stipules free;7
7. 002-001

<Pistillate flowers>Perianth

without perianth8
8. 005-001

<Pistillate flowers>Stigma

stigma , persistent.9
9. 005-002

<Staminate flowers>Stamens

stamens .10
10. 004-002

<Staminate flowers>Tepals

with , tepals11
11. 004-001

Description

Subshrubs, monoecious, without stinging hairs. Leaves alternate, distichous; stipules free; blade pinnately veined. Inflorescences bisexual, sessile, subcapitate glomerules with (sub)sessile flowers. Staminate flowers with 4, connate tepals; stamens 4. Pistillate flowers without perianth; stigma filiform, persistent. Fruit an achene.

Distribution

Guianas present, Neotropical present
Neotropical, 10-15 species; in the Guianas one species.

Fruits

Fruit an achene.12
12. 006

Habit

Subshrubs, monoecious, .13
13. 001

Inflorescences

Inflorescences bisexual, sessile, subcapitate glomerules with (sub)sessile flowers.14
14. 003

Leaves

Leaves alternate, distichous;15
15. 002

Notes

No material available from the Guianas. Based on Bonsen & ter Welle (1984): P. angustifolius (Peru).

Pistillate flowers

Pistillate flowers ;16
16. 005

Staminate flowers

Staminate flowers ;17
17. 004

Wood

Growth rings faint or absent. Vessels diffuse, solitary and in radial multiples of 2-4, round to oval, 15-25 per sq. mm, diameter 70-100 μm. Vessel-member length: 240-450 μm. Perforations simple. Intervascular pits alternate, polygonal, 6-10 μm. Vessel-ray and vessel-parenchyma pits as the intervascular pits. Thin-walled tyloses present or absent.
Rays uniseriate (occasionally present) and 2-3 seriate (15-30 μm) wide, 5-6 per mm, up to several mm high. Heterogeneous, composed of square and upright cells. Druses sometimes present.
Parenchyma scarce, paratracheal, vasicentric. Strands of 2-4 cells.
Fibres non-septate, lumen 15-30 μm, walls 3-5 μm. Pits simple, on radial and tangential walls. Length: 665-1745 μm.