9.1. Okenia hypogaea Schlechtendal & Chamisso (1830: 92–93).

Lectotype (here designated):― MEXICO, Veracruz, Crescit haec planta in collibus arenosis prope Vera-Cruz, Schiede & Deppe 107 (M0274570 [image!] image available at https://plants.jstor.org/stable/10.5555/al.ap.specimen.m0274570; isolectotype: MO 107656 [image!] image available at http://legacy.tropicos.org/Image/52205).

Typification of the name Okenia hypogaea:― Schlechtendal & Chamisso (1830: 92–93) provided, in the protologue of O. hypogaea, a description, a locality (“Crescit haec planta in collibus arenosis prope Vera-Cruz”), and the number of collection (“107”). There are two specimens of O. hypogaea, collected by Schiede & Deppe and numbered with 107, deposited at MO (barcode MO107656) and M (barcode M0274570). These specimens correspond to sintypes according to Art. 9.6 ICN. M0274570 is here designated as lectotype since it shows flowers, the distinctive roots at the nodes, the long peducules, matches Schlechtendal & Chamisso’s protologue, and corresponds to the currect concept in Okenia (see e.g., Spellenberg 2001, Spellenberg 2003). Note that on M0274570 there is a label that reads: “Ex herbario regio berolinensi”. So a further specimen would be deposited at B; however, we did not find it, being probably destroyed as annotated by Spellenberg in 1999 on a label occurring on MO107656.

Distribution in Mexico: ―It is reported from Campeche, Chiapas, Colima, Estado de México, Guerrero, Hidalgo, Jalisco, Michoacán, Morelos, Nayarit, Oaxaca, Querétaro, Quintana Roo, San Luis Potosí, Sinaloa, Sonora, Tabasco, Tamaulipas, Veracruz, Yucatán and Zacatecas (Villaseñor 2016). In Sonora it is distributed in Sonoran biogeographic province (Fig. 4A), Huatabampo municipality, in beach dunes and xerophytic scrub at 0–50 m a.s.l.