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: Helianthe ae). A cladistic study based on morphological and chromosomal data ind icates that Heliopsis and Philactis are its immediate sister taxa. Teh uana calzadae differs from the latter true genera in having pales with subulate tips, disc cypselae with four ribs, and disc corollas with u nevenly thickened biconvex tubes, as shown in illustration and a key t o genera of subtribe Zinniinae.