Scyphostelma stenospira (K. Schum.) Liede, Meve & Y. M. Pineda, comb. nov.

≡ Cynanchum stenospira K. Schum. in Bot. Jahrb. Syst. 25: 729. 1898.

– Lectotype (designated here): Ecuador, Pichincha, near Pomasqui, Sep 1894, L. Sodiro 107/15 (QPLS210834 digital image!; isolectotypes: F V0043840F digital image!, P00140189!) .

Nomenclatural note — Because the original material in B has been destroyed, lectotypification is necessary. Of the three located duplicates, the specimen in QPLS is particularly well preserved and therefore selected to serve as the lectotype. The isotype in F consists of a single short shoot only (“kleptotype”) together with a photograph of the destroyed holotype in B.

Remarks — The affinities of Scyphostelma stenospira are unclear. The species shares narrowly linear leaves with S. purpurascens and S. quitense, but its leaf texture is much more membranous than in those species. The corona is reminiscent of S. fasciculiflorum (Fig. 11) and S. purpurascens with staminal lobes broadly rectangular in the basal half but then suddenly shouldered and terminating in a longer tooth.

This species was not included in the phylogenetic analysis.