Euphorbia lancifolia Schlechtendal (1832: 143)

Steinmann, Victor W., 2023, Typification of Mexican Euphorbia (Euphorbiaceae), Phytotaxa 630 (1), pp. 61-68 : 63

Euphorbia lancifolia Schlechtendal (1832: 143) .

≡ Poinsettia lancifolia (Schlechtendal) Klotzsch & Garcke in Klotzsch (1860[1859]: 253).

Lectotype (designated here):— MEXICO. Veracruz, [in sylvis umbrosis Misantlae ], March 1929, C.J.W. Schiede 36 ( HAL barcode HAL0043178 photo!; isolectotypes F no. 516072 !, MO no. 3532049 !, P barcode P00606966 !).

Euphorbia lancifolia is a widespread perennial herb ranging from southern Mexico to northern South America. It is an important medicinal plant known locally as ixbut and employed as a galactagogue ( Rosengarten 1982). Schlechtendal described it based on a collection made by Christian Julius Wilhelm Schiede in Veracruz, Mexico. The holotype at B was destroyed during the bombardment of Berlin in the Second World War, but a photo of this specimen exists (Field Museum Negative #18056). There are four known duplicates, and of these, the specimen at HAL is designated as the lectotype because it is the most complete.