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Salix retusa L.
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Creeping willows: Blunt-leaved Willow
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Salicaceae
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Transversal section |
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Diffuse- to semi-ring-porous. Pores solitary or in short radial files of 2 to 3 pores, occasionally clustered. Growth ring boundaries more or less distinct, depending on abruptness of the pore size transition. Sparse apotracheal parenchyma, occasionally terminal parenchyma in uniseriate, discontinuous bands. |
          
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Radial section |
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Simple perforation plates. Heterogeneous rays with one to two rows of square and upright, mostly marginal cells. Large, simple ray-vessel pits. Libriform fibres present. |
 
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Tangential section |
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Uniseriate, very rare biseriate, rays. Ray height: 5 to 15, rare up to 30 cells. |
    
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Key characters |
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Diffuse- to semi-ring-porous. Uniseriate heterogeneous rays. Large ray-vessel pits. |
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Remarks |
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The wood of the creeping willows resembles on the basis of characteristics features (heterogeneous rays and large pits) the other species of Salix. The distinction, particularly of branch wood, between creeping, bush, and tree species is possible in only a limited number of cases, e.g. for S. retusa (semi-ring-porous, pores densily packed, pores in clusters), S. herbacea (similar to S. retusa, in subterranean stems often root-like structure), S. reticulata (pores relatively widely spaced, solitary or in small clusters). |
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