Scyphostelma stenospira (K. Schum.) Liede, Meve & Y. M. Pineda, 2023

Pineda, Yam M., Keller, Héctor A., Balderrama-Torrico, José A., Meve, Ulrich, Nürk, Nicolai M. & Liede-Schumann, Sigrid, 2023, Phylogenetics in Scyphostelma (Apocynaceae: Orthosiinae) and description of new species, Willdenowia 53, pp. 83-112 : 101

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.

Figures

Fig. 11. Scyphostelma fasciculiflorum – A: leaf; B: flower, one corolla lobe removed; C: corona lobe, adaxial view; D: gynostegium; E: pollinarium. – A–E from the isotype, F. I. Ortíz & J. Jaramillo 148 (QCA). – Drawn by U. Meve.