Valsecchi, Francesca (1977) Contributo alla conoscenza del genere Echium: I. Echium della Sardegna. Webbia, Vol. 32 (1), p. 101-127. ISSN 0083-7792. Article.
The author makes in this work a survey of the species of the genus Echium, known up to now in Sardinia, and points out some of the problems connected with them. For some species further research in the distribution area of the genus (with particular regard to Italy) and accurate comparisons with similar entities are necessary in order to ascertain their specific character, for some species their actual presence in Sardinia has to be verified. The following species have been recognized: E. italicum L.; E. asperrimum Lam.; E. plantagineum L.; E. parviflorum Moench; E. sabulicofum Pomel; E. creticum L. ssp. creticum e ssp. coincyanum (Lac.) Fernandes; E. vulgare L.; E. pustulatum S. et S. A careful study is still necessary to come to definitive conclusions on E. arenarium Guss. and E. elegans Lehm.
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