Tehuana calzadae (Asteraceae: Heliantheae) gen et sp nov from the Pacific Coast of Oaxaca, Mexico

Tehuana calzadae is a new genus and species from the Pacific coast of Oaxaca, Mexico, belonging to subtribe Zinniinae (Asteraceae: Heliantheae). A cladistic study based on morphological and chromosomal data indicates that Heliopsis and Philactis are its immediate sister taxa. Tehuana calzadae differs from the latter true genera in having pales with subulate tips, disc cypselae with four ribs, and disc corollas with unevenly thickened biconvex tubes, as shown in illustration and a key to genera of subtribe Zinniinae.