Discussion in relation to previous studies

The only existing study was made by Carlquist (1982), on the basis of 5 genera (Buxus, Notobuxus, Sarcococca, and Styloceras). Many authors described Buxus sempervirens. Gregory (1994) and Metcalfe and Chalk (1957) provide many further references. The present confirms observations from earlier studies.

Present features in relation to the number of analyzed species

IAWA code frequency

CD rt CD U

X CO

Total number of species

1 growth rings distinct and recognizable

2 growth rings indistinct or absent 2.1 only one ring

5 diffuse-porous

9 vessels predominantly solitary

11 vessels predominantely in clusters

14 vessels with scalariform perforation plates

20 intervessel pits scalariform

40.1 earlywood vessels: tangential diameter <20 pm

40.2 earlywood vessels: tangential diameter 20-50 pm

50.1 100-200 vessels per mm2 in earlywood

50.2 200-1000 vessels per mm2 in earlywood 58 dark-stained substances in vessels and/or fibers present (gum, tannins)

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

69 fibers thick-walled

70 fibers thin- to thick-walled

76 parenchyma apotracheal, diffuse in aggregates

96 rays exclusively uniseriate

97 ray width predominantly 1-3 cells

105 ray: cells upright or square

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

107 ray: heterocellular with 2-4 upright cell rows

(radial section)

R1 groups of sieve tubes present

R3 distinct ray dilatations

R4 sclereids in phloem and cortex R6.1 sclereids in tangential rows

R7 with prismatic crystals

R8 with crystal druses

R10 phloem not well structured

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