"granite boulders on hills above Adona, altitude over 2000 feet" [details]
"Sokotra, south side of the island, from limestone rocks, altitude 1000 feet" [details]
"Hadibu near Adona, altitude over 1500 feet, rock granite" [details]
"Sokotra, common on limestones at the east end of the island" [details]
"limestone at an altitude of over 1000 feet on the top of the ridge overlooking Gollonsir village" [details]
"Sokotra, on limestone ridge S.W. of Gollonsir at high altitude; at 1000 feet on south side of the island" [details]