Iresine angustifolia Euphrasén, 1795

Thomas Borsch, Hilda Flores-Olvera, Silvia Zumaya & Kai Müller, 2018, Pollen characters and DNA sequence data converge on a monophyletic genus Iresine (Amaranthaceae, Caryophyllales) and help to elucidate its species diversity, Taxon 67 (5), pp. 944-976 : 964-965

Iresine angustifolia Euphrasén

in Beskr. St. Barthél.: 165. 1795 –

Holotype: St. Barthelemy, 1788, J.E. Forsström s.n. ( S No. S-R-3037 [image!]; isotypes: S Nos. S 07-13086 [image!], S 07-13087 [image!], S 07-13088 [image!], S 07- 13090 [image!] & S 07-13091 [image!]) .

= Iresine elatior Rich. ex Willd ., Sp. Pl. 4: 766. 1805 ≡ Rosea elatior (Rich. ex Willd.) Mart. , Nov. Gen. Sp. Pl. 2: 59. 1826 – Lectotype (designated here): s.coll. s.n. (B-W barcode B -W 18362 -04 0! [image!]).

= Iresine edmonstonei Hook.f. in Trans. Linn. Soc. London 20: 190. 1847 – Holotype: ECUADOR. Galapagos Islands, Edmonston s.n. (K barcode K000583147!).

= Iresine lanceolata Moq. in Candolle, Prodr. 13(2): 347. 1849 – Holotype: Locality unknown, Pavon s.n. (P barcode P00623773 [image!]).

= Iresine pacifica Standl . in Contr. U.S. Natl. Herb. 18: 96. 1916 – Holotype: MEXICO. Colima, Manzanillo, Palmer 932 (GH barcode 00037109! [image!]); isotype: US).

= Iresine laxissima S.F.Blake in Contr. Gray Herb. 53: 56. 1918 – Holotype: MEXICO. Oaxaca, Depto. Pochutla, Río Concordia, 600 m, 23 Apr 1917, Conzatti, Reko & Makrinius 3166 (GH barcode 00037107! [image!]; isotypes: MEXU barcodes MEXU 00012705! [image!], MEXU 00525840! [image!] & MEXU 00525883! [image!]).

= Iresine laxissima var. ecuadoriensis Suess. in Repert. Spec. Nov. Regni Veg. 44: 40. 1938 – Lectotype (designated here): ECUADOR. Bolivar, S of Balzapamba , 500 m, 23 Oct 1933, H.J.F. Schimpff 281 ( M barcode M-0241851 [image!] ; isolectotypes: G, M barcode M-0241852 ! [image!], US) .

Note. – The type of Iresine edmonstonei that was collected by Edmonston might have been from a plant introduced by early settlers or the specimen was mislabeled to originate from Galapagos ( Eliasson, 1985). The folder of I. elatior in the Willdenow herbarium (B) contains four sheets, only two of which have labels. Sheet 0 4 is the only one with a label saying “ Iresine – spec. nova”. The fact that the folder itself contains on its inside three more labels, out of the hand of Bonpland as well as Schlechtendahl (H.W. Lack, pers. comm.) is a further indication of a different origin of the sheets but also that these three labels cold not unambiguously be assigned to any of the sheets. A lectotypification is therefore warranted. The geographic origin of the specimens is unknown. The type specimen of I. laxissima is from a hermaphroditic plant and has only bisexual flowers.

The name “ Rosea poeppigiana Klotzsch ” is not validly published but was listed by Seubert (1875) as a synonym of I. elatior Rich. ex Willd. There is a specimen in B ( E.F. Poeppig s.n., B 10 0 242399, from Brazil, Pará) annotated with the name “ Rosea poeppigiana Kl. ”. The handwriting is clearly by J.F. Klotzsch (R. Vogt, pers. comm.). Seubert cited this name as it was often practised at the time.

Taxonomic status: Species limits not yet studied in detail (B).