''Isocoma tehuacana'' is a rare Mexican species of

plant Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclud ...

s in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

. It has been found only in the

State of Puebla Puebla ( en, colony, settlement), officially Free and Sovereign State of Puebla ( es, Estado Libre y Soberano de Puebla), is one of the 32 states which comprise the Federal Entities of Mexico. It is divided into 217 municipalities and its cap ...

in eastern Mexico. As of 1991, it was known from only one collection made in 1841, so the species is most likely extinct.Nesom, G.L. 1991. Taxonomy of ''Isocoma'' (Compositae: Astereae). Phytologia 70(2): 69–114
description of ''I. tehuacana'' on page 107, distribution map on page 75 ''Isocoma tehuacana'' is a subshrub up to 30 cm (1 foot) tall, forming clumps of numerous stems. Stems and leaves are covered with hairs. Each flower head contains about 20 disc flowers but no ray flowers.

References

tehuacana Endemic flora of Mexico Flora of Puebla Plants described in 1991 {{Astereae-stub