| Titre : |
Population dynamics and flowering in a hawaiian alpine rosette plant, Argyroxiphium sandwicense |
| Type de document : |
texte imprimé |
| Auteurs : |
Philip Rundel, Auteur ; M.S. Witter, Auteur |
| Importance : |
pp. 295-306 |
| Langues : |
Anglais (eng) |
| Catégories : |
[ZG] Hawaï
|
| Résumé : |
"A notable feature of tropical alpine floras in many parts of the world is the presence of rosette plants with monocarpic growth habits. These long-lived perennials flower only once in their lives, producing a giant inflorescence with large numbers of flowers before the parent plant dies. In the South American páramos of Venezuela, species of Espeletia (Asteraceae) provide classic examples of this life-form (Cuatrecasas 1986; Berry & Calvo, Chapter 13)). Giant species of Afroalpine Lobelia (Campanulaceae) reach to 5–6 m in height when flowering before dying, and form one of the most spectacular elements of the flora of the tropical African highlands (Mabberley 1974; Young, Chapter 14). On Tenerife in the Canary Islands, two alpine species of Echium (Boraginaceae) have also evolved rosette growth forms and a monocarpic habit (Carlquist 1974). In each of these groups, the monocarpic rosette plants have evolved from polycarpic ancestors with a shrubby growth form.
Argyroxiphium sandwicense (Asteraceae) provides another well-known example of the evolution of a monocarpic rosette plant in a tropical alpine environment. The genus Argyroxiphium, with five species, is one of three genera of Hawaiian tarweeds that have evolved from a monophyletic North American origin (Carr 1985; Witter & Carr 1988; Baldwin et al. 1991). This group displays a remarkable diversity of growth forms and adaptive morphologies. Monocarpic rosette plants have evolved not only in species of Argyroxiphium in bog and in alpine habitats, but also in Wilkesia gymnoxiphium, a stalked rosette plant in scrub and open forest habitats." (source : auteurs) |
| Type de publication : |
article de livre |
| Référence biblio : |
Rundel P., Witter M.-S., 1994 - Population dynamics and flowering in a hawaiian alpine rosette plant, Argyroxiphium sandwicense. In : 1994 - Tropical alpine environments : plant form and function. Cambridge University Press, 295-306. |
| ID PMB : |
7605 |
| Permalink : |
http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=7605 |
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Population dynamics and flowering in a hawaiian alpine rosette plant, Argyroxiphium sandwicense