Discussion in relation to previous studies

Carlquist (1998) analyzed the xylem of 7 Resedaceae species (Caylusea hexagyna, Ochradenus baccatus, Oligomeris linifolia, Reseda alba, R. crystallina, R. lutea and R. luteola). Neumann et al. (2004) studied 3 shrubs from the arid Sahara (Randonia africana, Ochradenuns baccatus, Reseda villosa); Fahn et al. (1986) recorded the wood anatomy of the desert shrub Ochradenus baccatus. Schweingruber (1990) studied the dwarf shrub Reseda suffruticosa and the hemicryptophyte Reseda luteola from Central and southern Europe.

The present study confirms the findings of all previous analyses. New is the detection of included phloem in the genus Reseda (Reseda scoparia).

Present features in relation to the number of analyzed species

IAWA code frequency

Total number of species 9

1 growth rings distinct and recognizable 5

2 growth rings absent 3

4 semi-ring-porous 4

5 diffuse-porous 4

6 vessels in intra-annual tangential rows 7 9 vessels predominantly solitary 2 9.1 vessels in radial multiples of 2-4 common 1 11 vessels predominantly in clusters 8 13 vessels with simple perforation plates 9 20 intervessel pits scalariform 4 29 vestured pits 1

40.2 earlywood vessels: tangential diameter 20-50 pm

50.1 100-200 vessels per mm2 in earlywood

58 dark-staining substances in vessels and/or fibers

(gum, tannins)

61 fiber pits small and simple to minutely bordered (<3 pm = libriform fibers)

68 fibers thin-walled

69 fibers thick-walled

70 fibers thin- to thick-walled

70.2 tension wood present

76 parenchyma apotracheal, diffuse and in aggregates

79 parenchyma paratracheal

96 rays exclusively uniseriate

97 ray width predominantly 1-3 cells

98 rays commonly 4-10-seriate 105 ray: all cells upright or square

106 ray: heterocellular with 1 upright cell row (radial section) 1

107 ray: heterocellular with 2-4 upright cell rows

(radial section) 5

120 storied axial tissue (parenchyma and vessels) 1

134 successive cambia, diffuse = foraminate 1

R6 sclereids in radial rows 6

R6.1 sclereids in tangential rows 1

R10 phloem not well structured 4

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