Hippeastrum, Herbert, 1821

Florentín, Javier E., Medina, Walter A., Salas, Roberto M. & Roitman, German, 2023, Hippeastrum euryphyllum (Amaryllidaceae), a microendemic species from northeastern Argentina: new combination, description, taxonomic identity and distribution, Phytotaxa 625 (2), pp. 220-226 : 224

Identification key to Hippeastrum from Corrientes, Argentina

1. Flowers light yellow. Perigone trumpet-shaped with a long tube (9–10 cm long). Growing in rocky slopes, between rocks and sandy soil, surrounding by xerophytic vegetation....................................................................................................... H. euryphyllum

- Flowers red or orange. Perigone funnel-shaped with a short tube (2 cm long). Growing in inundated or seasonally waterlogged areas, mostly with hydromorphic vegetation.....................................................................................................................................2.

2. Flowers red. Perigone zygomorphic, tepals 1 cm wide, lower petal smaller than the upper ones. Leaves 2 cm wide, glaucous. Bulb single or with few bulblets. Growing in marshes...................................................................................................... H. angustifolium

- Flowers orange. Perigone slightly zygomorphic, tepals 2.5 cm wide, lower and upper petals similar. Leaves 3.5 cm wide, dark green. Bulbs with several small bulblets. Growing in river borders ................................................................................. H. striatum