Tzeltalia graciellae (Solanaceae), a new species from the states of Guerrero and Oaxaca, Mexico

Tzeltalia graciellae (Solanaceae), a new species from the states of Guerrero and Oaxaca, Mexico, is described and illustrated. This species is related to T. esenbeckii, but can be distinguished by its (4–)6–10(–11) flowers per fascicle, pedicels 10–16 mm long, spherical fruit calyx 4.5–7 mm long, fruits 3–6 mm in diameter, and entire leaf margins. A detailed comparison table, a key to the known species of Tzeltalia, and photographic illustrations are provided.