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→Laticifers
Laticifers in wood (secondary xylem) usually extend radially in the rays (in Apocynaceae, Asclepiadaceae, Campanulaceae, Caricaceae, Euphorbiaceae and Moraceae) or axially (only known in Moraceae).
Articulated laticifers are formed in concentric rings in the bark of the stem of Hevea brasiliensis and in the phloem of the root of ''Taraxacum kok-saghyz '' L.E.Rodin. Branching and subsequent anastomosis in these plants only occurs tangentially between laticifers of the same ring.
Non-articulated laticifers are found in the ''Apocynaceae, Asclepiadaceae, Euphorbiaceae'' (excluding ''Hevea'' Aubl. and ''Manihot'' Mill.) and ''Moraceae'', whereas articulated laticifers occur in ''Caricaceae, Compositae, Hevea'' and ''Manihot'' (''Euphorbiaceae''), ''Papaveraceae'' and ''Sapotaceae''.
In ''Parthenium argentatum'' A.Gray ("guayule", ''Compositae''), latex occurs in parenchymatous cells. This is, however, the only example of laticifers that are not morphologically differentiated. In a few species, notably ''Guajacum officinale'' ("lignum vitae", ''Zygophyllaceae'') there is rubber in the xylem.
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