Revision of Euphorbia sect. Chylogala (Euphorbiaceae)

Abstract Geltman D. V.: Revision of Euphorbia sect. Chylogala (Euphorbiaceae). — Willdenowia 43: 5–12. June 2013. — Online ISSN 1868-6397; © 2013 BGBM Berlin-Dahlem. Stable URL: http://dx.doi.org/10.3372/wi.43.43101 After the rearrangement of the system of Euphorbia subg. Esula Pers., E. sect. Chylogala (Fourr.) Prokh. contains four species: E. alaica (Prokh.) Prokh. (mountains of Middle Asia), E. heteradena Jaub. & Spach (Southwest Asia), E. retusa Forrsk. (deserts of North Africa and Southwest Asia) and E. serrata L. (West Mediterranean). This group is revised here. Special attention is given to E. alaica, a poorly known species from Kyrgyzstan and Tadjikistan. Lectotypes are designated for the names Euphorbia coriacea K. Koch, E. megalantha Boiss. and E. megalantha var. denticulata Boiss.