Abstract

The current study present morphological characteristics of the two genera,that belong to the family Malvaceae s.l., in Toor Al-Baha district, Lahej Governorate, Yemen, from August 2020 to January 2022, an introductory order deals with the most significant features, synonyms, and local names, distribution in  the study area, in addition to a key for separation between of two genera and two species belong to the  genus of Sida in the  studied area, and up-to-date nomenclature for all studied taxa are presented, by using modern classification of Malvaceae which referred to sub-family is Malvoideae, within family Malvaceae s.l.
The present study a revision of the morphological characteristics of three species grow native in the studied area are (Malvastrum coromandelianum, Sida alba and Sidaovata), The vegetative and reproductive morphological characteristics proved that they are with high values in distinguishing between them.