"herbaceous flora were the Malvaceae, Leguminosae, Rubiaceae, Compositae, Aclti-pi-adaceae, Convolvulaceae, Solanaceae, Eu-phorbiaceae and Commelinaceae besides the grasses, sedges and ferns.) In the vicinity of Orizaba the Compositae had their greatest display. The essentially Amer-ican Helianthoidiae were the forms most abundant and not only are they character-istic of this particular region but have in Mexico their greatest concentration, amounting it had estimated to 32% of the species and 7/5 of the genera of all the Compositae of the country. The sub Order Eupatoridae ranks second in numerical strength, the genera Eupatorium & Vicia however contributing nearly all the species. The Asteroidae had but little representation in the forms that are so characteristic of the North - Solidago, Aster, Verigeros. All the other sub orders of the family were present, excepting the Arctotidaceae & Calendulaceae which are confined to Africa & the Mediterra-nean region. (1) Collections were made at three successively higher stations till the altitude of 9000" was reached and this zone of 5000" may be considered as the temperate region and that above 9000" as al-pine. Many plants of the subtropical region extenda their range to the temper-ate and even to the alpine district, this being especially true of low growing plants