Herbaceous perennial, reaching 40 cm in height. Simple, erect stem, part of which and petiole of basal leaves are subterranean. Deltoid, linear-lanceolate, opposite leaves, 2-4-pinnatisect, with narrow segments. Small, white flowers, borne in compound umbels, in numbers of 1-4, pedunculate and terminal, with 6-12 unequal rays. Bracts and bracteoles absent. Ovate-oblong fruits, approximately 5.2 mm.
Very rare species which inhabits very high rocky areas above altitude of 1000 m on Madeira.