Discussion in relation to previous studies

The xylem of the tree-like genera Averrhoa and Sarcotheca have been described by several authors (see Gregory 1994). Heimsch (1942) mentioned ray characteristics in Oxalis species. The species presented here have never been described before.

Fig. 13. Irregularly formed crystal bodies in the outer part of the cortex. Root collar of a 30 cm-high therophyte, ruderal site, subtropical arid zone, La Palma, Canary Islands. Oxalispres-caprae, transverse section, polarized light.

Left Fig. 11. Bark with a simply structured sc phloem. Outside of the small cortex is a phellem consisting of collapsed cells. Root collar of a 15 cm-high hemicryptophyte, ruderal site, hill zone, Switzerland. Oxalis corniculata, transverse section.

Right Fig. 12. Bark with an outer thin-f walled part, which is divided by a small band of sclerenchyma from the inner part pa containing thicker-walled smaller cells. The phloem is simply structured. Root collar ^ of a 20 cm-high hemicryptophyte, ruderal site, hill zone, Switzerland. Oxalis stricta, v radial section.

Fig. 13. Irregularly formed crystal bodies in the outer part of the cortex. Root collar of a 30 cm-high therophyte, ruderal site, subtropical arid zone, La Palma, Canary Islands. Oxalispres-caprae, transverse section, polarized light.

pith

Fig. 14. Bark with an outer thin-walled part, which is divided by a uniseriate en-dodermis from the inner part containing thicker-walled smaller cells. The phloem is simply structured. Root collar of a 30 cm-high therophyte, ruderal site, subtropical arid zone, La Palma, Canary Islands. Oxalis pres-caprae, transverse section.

KV1V

vab di

Fig. 15. A simply structured phloem located between large ray dilatations in the radial continuation of a vessel strip. Outside of the small cortex is a phellem consisting of collapsed cells (dark layer). Root collar of a 30 cm-high hemicryptophyte, ruderal site, hill zone, Andes, Argentina. Oxalis subacaulis, transverse section.

Present features in relation to the number of analyzed species

70

fibers thin- to thick-walled

2

IAWA code

frequency

79

parenchyma paratracheal

1

Total number of species

4

79.1

parenchyma pervasive

3

2 growth rings absent

3

89

parenchyma marginal

1

2.1 only one ring

1

97

ray width predominant 1-3 cells

1

5 diffuse-porous

4

99

rays commonly >10-seriate

1

9 vessels predominantly solitary

4

99.1

vascular-bundle form remaining

1

13 vessels with simple perforation plates

4

100.1

rays confluent with ground tissue

1

20 intervessel pits scalariform

1

105

ray: all cells upright or square

3

20.1 intervessel pits pseudoscariform to reticulate

1

108

ray: heterocellular with >4 upright cell rows

(radial section) 1

22 intervessel pits alternate

3

117

rayless

2

39.1 vessel cell-wall thickness >2 pm

3

142

prismatic crystals in axial chambered cells

1

40.2 earlywood vessels: tangential diameter 20-50 pm

4

R3

distinct ray dilatations

1

50.1 100-200 vessels per mm2 in earlywood

4

R6.1

sclereids in tangential rows

2

60.1 fibers absent

2

R7

with prismatic crystals

1

62 fiber pits large and distinctly bordered

R8

with crystal druses

1

(>3 pm = fiber tracheids)

2

R10

phloem not well structured

4

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