(en) Steven J. Wagstaff et Françoise Hennion, « Evolution and biogeography of Lyallia and Hectorella (Portulacaceae), geographically isolated sisters from the Southern Hemisphere », Antarctic Science, vol. 19, no 4, , p. 417–426 (ISSN0954-1020 et 1365-2079, DOI10.1017/S0954102007000648, lire en ligne, consulté le )
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(en) Steven J. Wagstaff et Françoise Hennion, « Evolution and biogeography of Lyallia and Hectorella (Portulacaceae), geographically isolated sisters from the Southern Hemisphere », Antarctic Science, vol. 19, no 4, , p. 417–426 (ISSN0954-1020 et 1365-2079, DOI10.1017/S0954102007000648, lire en ligne, consulté le )
(en) Steven J. Wagstaff et Françoise Hennion, « Evolution and biogeography of Lyallia and Hectorella (Portulacaceae), geographically isolated sisters from the Southern Hemisphere », Antarctic Science, vol. 19, no 4, , p. 417–426 (ISSN0954-1020 et 1365-2079, DOI10.1017/S0954102007000648, lire en ligne, consulté le )