Ptilotrichum longicaule, (Boiss.) Boiss.

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 : 306

6. P. longicaule (Boiss.) Boiss. , Elenchus 13 (1838).

Laxly caespitose perennial, woody at the base. Stems 25-60 cm, fragile. Basal leavesobovate-spathulate, attenuate into petiole; cauline leaves few, linear-lanceolate; allgrey-tomentose. Petals white. Silicula obovoid, glabrous. Seeds broadly winged. Limestone rocks and cliffs. • S. Spain. Hs. P. cadevallianum (Pau) Heywood , Feddes Repert. 66: 55 (1962) with suborbicular or obovate-spathulate leaves, flowering stems 20 cm and silicula 9 x 7 mm, was described from S. Spain (El Maimón, near Vêlez Rubio). It resembles 6 in some respects but is of very uncertain affinity.