Characteristics of the phloem and the cortex

Sieve tubes and parenchyma rows alternate in indistinct tangential bands. Groups of sclerenchyma cells are rare (Figs. 9 and 10). Ray dilatations are distinct (Fig. 10). Crystal druses occur mainly in ray cells.

Fig. 2. Vessel with a scalariform perforation of 20 bars. Stem of a 2 m-high shrub, hill zone, Botanical Garden Munich, Bavaria, Germany. Staphylea colchica, radial section.

Fig. 1. Diffuse- to semi-ring-porous xylem with distinct annual rings. Stem of a 2 m-high shrub, hill zone, Botanical Garden Munich, Bavaria, Germany. Staphylea colchica, transverse section.

Fig. 2. Vessel with a scalariform perforation of 20 bars. Stem of a 2 m-high shrub, hill zone, Botanical Garden Munich, Bavaria, Germany. Staphylea colchica, radial section.

Fig. 3. Thin-walled tylosis in a vessel. Stem of a 2 m-high shrub, hill zone, Botanical Garden Munich, Bavaria, Germany. Sta-phylea colchica, radial section.

Fig. 1. Diffuse- to semi-ring-porous xylem with distinct annual rings. Stem of a 2 m-high shrub, hill zone, Botanical Garden Munich, Bavaria, Germany. Staphylea colchica, transverse section.

Fig. 4. Horizontally enlarged ray-vessel pits. Stem of a 2 m-high shrub, garden, hill zone, Zürich, Switzerland. Staphylea pin-nata, radial section.

Fig. 5. Large fiber pits. Stem of a 2 m-high shrub, garden, hill zone, Zürich, Switzerland. Staphylea pinnata, radial section.

Fig. 6. Scanty paratracheal and rarely apo-tracheal diffuse parenchyma. Stem of a 2 m-high shrub, garden, hill zone, Zürich, Switzerland. Staphylea pinnata, transverse section.

100 Mm

Left Fig. 7. Heterocellular ray with a few procumbent central, and many square and upright marginal cells. Stem of a 2 m-high shrub, garden, hill zone, Zürich, Switzerland. Staphyleapinnata, radial section.

Right Fig. 8. 1-5-seriate, heterocellular rays. The large ray has sheet cells. Stem of a 2 m-high shrub, garden, hill zone, Zürich, Switzerland. Staphylea pinnata, tangential section.

100 Mm pa

Left Fig. 9. Phloem and cortex with a group of sclerenchyma cells and some lig-nified fibers within a tissue of unlignified sieve tubes and parenchyma cells. Stem of a 2 m-high shrub, garden, hill zone, Zürich, Switzerland. Staphylea pinnata, transverse section.

Right Fig. 10. Tangential rows of cells and collapsed sieve-tubes. Stem of a 2 m-high shrub, hill zone, Botanical Garden Munich, Bavaria, Germany. Staphylea colchica, transverse section.

Discussion in relation to previous studies 14 vessels with scalariform perforation plates 2

22 intervessel pits alternate 2

The anatomy of the xylem of the five genera of Staphyleaceae 32 VesseJ'arafaPitsiWithaliarSe h°rizontal aPertures>

was described by Carlquist and Hoeckman (1985). Staphylea ^ hdi^^a^ninge^res^ 1

pinnata was described by Greguss (1945), Grosser (1977) and 40.2 earlywood vessels: tangential diameter 20-50 pm 2

Schweingruber (1990). Gregory (1994) mentioned 34 refer- 50.2 200-1000 vessels per mm2 in earlywood 2

ences concerning the xylem anatomy of Staphyleaceae. Hold- 56 tylosis with thin walls 2

heide (1951) described the bark of Staphylea pinnata. 62 fiber pits larg<;and distinctly bordered

70 fibers thin- to thick-walled 2

The horizontally enlarged ray-vessel pits and the scalariform 76 parenchyma apotracheal, diffuse and in aggregates 2

perforations bring Staphylea sp. close to the Hamamelidaceae. 79 parenchyma paratracheal 1

98 rays commonly 4-10-seriate 2

107 ray: heterocellular with 2-4 upright cell rows (radial section) 1

108 ray: heterocellular with >4 upright cell rows (radial section) 1 Present features in relation to the number of analyzed species 110 rays with sheet cells tangential section 1 IAWA code frequency 136 prismatic crystals present 1

Total number of species 2 R2 groups of sieve tubes in tangential rows 2

1 growth rings distinct and recognizable 2 R3 distinct ray dilatations 2

5 diffuse-porous 2 R4 sclereids in phloem and cortex 2

9 vessels predominantly solitary 2 R8 with crystal druses 2

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