Orostachys (DC.) Fischer ex Sweet

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 363

12. Orostachys (DC.) Fischer ex Sweet 1

Glabrous biennials with leaves in a compact, subglobose, basal rosette, from the centre of which an unbranched flowering stem arises in the second year. Leaves with a whitish cartilaginous border towards the apex, and a terminal spine. Flowers 5-merous, in a long, dense, thyrsoid raceme. Petals slightly connate at the base, patent. Stamens 10. Follicles free, erect; styles slender, straight.

Flowers subsessile, petals greenish-yellow; anthers yellow 1. spinosa Pedicels of lower flowers 3-8 mm; petals white or pink; anthers dark purple 2. thyrsiflora