Vataireopsis amroba. A plant for treating skin diseases
The wood of the tropical tree Vataireopsis araroba produces an exudate containing anthranoids (Goa powder, chrysarobin) which was ... read more
Some botanical observations on the origin of functionality through degeneration
The obvious correlation between the special form of a plant species and its living conditions easily leads... read more
The European species of the Ranunculaceae genus Clematis L.
This text is based on the chapter entitled 'Clematis' from an unfinished book manuscript by Thomas Göbel. It was edited by Ang... read more
Nicolaus E. Dahlberg: Die Metamorphosen der Pflanzen (Stockholm 1755)
In 1755, under the direction of Carl von Linné, the Swedish botanist Nicolaus (= Nils) E. Dahlberg (1735-1820) publi... read more
Periphery and centre — indicators for inversions in plant growth
Goethe said 'that nature has no secrets that she does not somewhere present naked to the eyes of the attentive observer'... read more
Nodes and internodes — on Goethe’s concept of the spiral tendency
Starting from the interesting phenomenon of biastrepsis (‘Zwangsdrehung’), the helical twisting of shoots, in whi... read more
The ’typus’ between irrationality and rationality - or: the secret law of chickweed wintergreen (‘star-flower’, Trientalis europaea)
The theory of phyllotaxis, the positions of le... read more
Greater spearwort (Ranunculus lingua L.)
Ranunculus lingua L. is a member of the buttercup family. It has petioleless, lanceolate leaves and grows in water close to the bank and reaches a... read more