By Gu Anlin & Wang Zongli
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Sex B,2: 113(1949); Markgraf, Fl. fam. Type: Madagascar, sin. n. (holotype Pf). 1991 (neotype P, isoneotypes BR, K, PRE, TAN, WAG). Fig. 9, p. 45;Map 8, p. 65. Homotypic synonym P. rutenbergianum var. in Bull. Acad. 4(1924). Taxonomicrevision ofPachypodium: Seriesof revisions ofApocynaceae XLV1II 45 Figure9. 1-4)Pachypodium lamerei: 1 =habit(x2/3),2=leaf(x2/3),3 =grain(x2),4=embryo(x 2). 5-8)P.
Brevicaule can easily be distinguished from the other species by the short trunk (2-8cm hight) with largediameter (10-40cm)andrather soft spines. P. brevicaule is not a variable species. The tuberous base has a very short part above the soil and an obconical subterraneous part producing roots penetrating more deeply intothe fisssures of therocks. Schum. in Engler &Prantl, Nat. Pflanzenfam. 4,2: 178 (1895). M. 4,p. 32. Heterotypic synonyms P. rosulatum var. Perrier in Bull. Soc. Bot. Fr. Inst. Sc.
Euphorbiaceae). Humbert 20215isfound on schists inlow openforest Onilahy basin near Sakoa. P. 5% water(Koechlinet al. 1974). geayijust asweencountered inthefield. Geay collected material of a sterile specimen. This specimen erroneously hasbeen cited as the type by Markgraf (1976). As the holotype seems to be no longer available, the collection Poisson 648bis isdesignated neotype. Pachypodium gracilius (H. Perrier) Rapanarivo, comb. nov. , Perrier de laBdthie 8866 (holotype P). Fig. 7, p. 57. V.