Êtes-vous un étudiant de l'EPFL à la recherche d'un projet de semestre?
Travaillez avec nous sur des projets en science des données et en visualisation, et déployez votre projet sous forme d'application sur GraphSearch.
Concept
Hydrangea radiata
Résumé
Hydrangea radiata is an attractive, deciduous shrub up to 3 m tall in the flowering plant family Hydrangeaceae. Its natural range is limited to the southern Appalachians, where it is fairly common. Its common names—silverleaf hydrangea or snowy hydrangea—reflect its distinctive foliage which is dark green on top and silvery white below; the sharply contrasting foliar colors makes this shrub conspicuous at a distance, especially in a breeze.
Silver hydrangea is native to the mountainous region (usually above 2,000 feet elevation) represented by the southern Blue Ridge Mountains from southeast Tennessee, east to North Carolina and northwestern South Carolina, and south to northeastern Georgia. It typically occurs near streams, rocky outcrops, and along roads, especially in the headwaters of the Chattooga River and also in the French Broad River Valley. It is conspicuous along roadsides near the junction of North Carolina, South Carolina, and Georgia—in the vicinity of Highlands, Cashiers, and Rosman, North Carolina. Some outlier occurrences of silverleaf hydrangea have been locally observed in the Piedmont Region; these populations may have escaped from cultivation.
Silverleaf hydrangea is similar to the more widespread smooth hydrangea (Hydrangea arborescens) and ashy hydrangea (Hydrangea cinerea). At one time both silverleaf hydrangea and ashy hydrangea were considered subspecies of smooth hydrangea. However, most taxonomists now consider them to be separate species, and that usage is adopted here. Evidence for separating these three closely related, native hydrangeas is based largely on cross-pollination experiments conducted by Ronald Pilatowski. The crosses yielded few viable seeds at best, indicating that despite overlapping ranges and characteristics, the plants maintained their genetic purity and their unique phenotypic characteristics.
The inflorescence of silver hydrangea is a corymb. The showy, sterile flowers (white to near white) and are comparatively abundant (2-15 per bloom) and are borne around the periphery of the corymb; they are usually greater than 1 cm in diameter.
Source officielle
À propos de ce résultat
Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.