Literature
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- Greuter W. 1973: Monographie der Gattung Ptilostemon (Compositae). — Boissiera 22: 215 pp., VIII tt.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
We take no responsibility for the content of any external websites listed above.