Yesterday, I visited a biotope of
Sempervivum arvernense in Ponsas located opposite of the cemetery, in the department of Drôme, France.
This station has the particularity to be located east of the Rhone (left bank), while the distribution of this species (or subspecies of
tectorum ) is located on the Massif Central (so west of the Rhone).
The photographic conditions were appalling. I made the visit in a violent storm. In addition the station is squatted by the
Opuntia humifusa (non-native plant) covering the rocks and certainly involved in choking houseleek.
Sempervivum are very rare, but the weather was very bad and the importance of the population was difficult to appreciate.
