hugh
J'ai trouvé un article où ils expliquent bien les différences entre ibicella lutea, proboscidea, Martinya et même Ibicella Nelsoniana, toutes de la famille des Martiniaceae.
extrait d'un article paru dans
the Bulletin of the A.C.P.S., 1994, 13:1, 6.
Suppose you are growing a plant from this family---how do you know if it it I. lutea, and not some noncarnivorous imposter? It is simple matter, as long as the plant is in flower. Look at the calyx (``calyx'' means all the sepals). In Proboscidea the calyx consists of five sepals which are fused together for about half their lengths, forming a loose sack which encloses the corolla tube. Underneath the flower the calyx is usually slit to the base. If you removed the calyx and flattened it, you would have a palmately-lobed single structure, like the maple leaf on the Canadian national flag. In contrast, the calyx lobes of Martynia and Ibicella are completely free from each other---in these two genera, the calyx consists of five distinct sepals. At the base of the calyx you will see one or two leafy bracts. Do not mistake these for calyx lobes.
If your plant has passed the first test, so you are certain it is not Proboscidea, the next step is to determine if it is Martynia or Ibicella. This is decided by the number of fertile stamens in each flower. Ibicella has four functional stamens, but in Martynia two are not fully developed and are sterile. These sterile stamens do not support pollen-bearing anthers. Of course, the happy CPer is one who discovers he or she has Ibicella and not Martynia. As a final check look at the flower colour. As Van Eseltine (1929) wrote and Cekic (1993) maintained, the corolla tube is greenish-yellow on the outer surface, and yellow to orange-yellow on the inner surface. (This is, of course, what the name I. lutea is telling us.) The palate region of the corolla may be dotted with orange or red spots, but this is not to say the flower is reddish. The flowers are very weakly scented, while the flowers of P. louisianica (for example) are strongly musky-sour. Another species of Ibicella is I. nelsoniana (which is sometimes called Hologregmia nelsoniana). This plant is distinguished by its small and narrow floral bracts, while the bracts of I. lutea are very similar to the sepals.
la web source :
http://www.sarracenia.com/pubs/ibicella.html
A la fin de l'article, il y a des références biblio qui permettent sans doute de savoir pourquoi ibicella est classée comme la seule carnivore des Martiniaceae, y compris dans cet article...
