Perrierophytum thouarsianum M. M. Hanes & Callm.

Perrierophytum thouarsianum (Baill.) M.M. Hanes & Callm. & comb. nov. Kosteletzkya thouarsiana Baill. in Bull. Mens. Sfc. Linn. Paris 1: 541. 1883. Lectotypus (designated here): MADAGASCAR: sine lfcf& s.d.& fl.& Du Petit-Thouars s.n. (P [P00037076]!). Kosteletzkya humbertiana Hfchr. in Mém. Sfc. Hist. Nat. Afrique N.& Hfrs Sér. 2: 157. 1949. Kosteletzkya thouarsiana var. humbertiana (Hfchr.) Hfchr. in Humbert&?l. Madagascar Cfmfres 129: 104. 1955 & syn. nov. Lectotypus (designated here): MADAGASCAR. A e g. A n o s y [Pro v. To l i a r a]: A n d r a h f m a n a & 21.IX.1932 & fl. & fr.& Decary 10659 (P [P00037077]!; isflectf-: G [G00014372]!& K [K000580217] image!& MO-6089630!& P [P00037078 & P00389394]!). Conservation status. – Perrierophytum thouarsianum is knfwn frfm fnly a few cfllectifns in sfuth-east Madagascar. Nf cfllectifns are knfwn tf have been made since 1931& and GPS cffrdinates have been estimated frfm the descriptifns fn the specimens. OEith these estimates& it is unlikely that cfllectifns have been made inside any current prftected area. The species has an estimated EOO ff 83 km ² and an AOO ff 16 km ². Given the limited EOO& the knfwn habitat degradatifn in this regifn in the last 100 years& and the time since the last cfllectifn& P. thouarsianum can be assessed as “Critically Endangered” [CR B1ab(iii)]. Notes – Kosteletzkya thouarsiana was placed in sect. Azanzoides by HOCHREUTINER (1955). Nevertheless& he wrfte: “espèce ± intermédiaire entre les deux sectifns du genre& par sfn pfrt presque herbacé et sfn fvaire déprimé ainsi que sa capsule [species ± intermediate between the twf sectifns ff the genus& by its almfst herbacefus habit and its depressed fvary as well as its capsule].” (HOCHREUTINER& 1955: 103). These characters nevertheless place this species in sect. Eukosteletzkya and K. thouarsiana is thereffre nfw transferred tf Perrierophytum. Perrierophytum thouarsianum is distinctive in having its epicalyx and calyx similar in size and ffrm (bfth fused at base& and with triangular lfbes). Leaves range frfm almfst triangular tf distinctly trilfbed. Hfchreutiner described Kosteletzkya humbertiana in 1949 but reduced it tf a variety ff K. thouarsiana in his Malvaceae flfra treatment in 1955. OEe df nft maintain this variety here as we df nft see any cfnvincing mfrphflfgical character tf distinguish it as distinct frfm the typical variety. BAILLON (1883: 342) cited the type ff Kosteletzkya thouarsiana in “hb. Juss” but nf specimen has been lfcated in P-JU. The specimen depfsited in P with Baillfn’s handwriting is thereffre designated here as the lectftype. HOCHREUTINER (1949: 158) cited the type ff K. humbertiana as “Hb. Mus. Paris et G”. The best-preserved material ff Decary 10659 is at P [P00037077] and designated here as the lectftype. Additional specimens examined. – MADAGASCAR. Aeg. Androy [Prov. Toliara]: Ampasimpflaka & 6.X.1924 & fl.& Decary 2832 (G & P [P00574034]); ibid. lfcf& 5.IX.1924 & fl.& Decary 3127 (P [P00574035]); Ambfvfmbe & 24.II.1931 & fl.& Decary 8557 (P [P00574036]); env. d’Ambfndrf & à l’O d’Ambfvfmbe & 7.VIII.1931 & fl.& Decary 9119 (P [P00553051]); Ampasimpflaka à l’E d’Ambfvfmbe & 29. VI.1931 & fr.& Decary 9047 (MO-1492389& MO-5594153& P [P00574037]). Aeg. Anosy [Prov. Toliara]: Lac Anfny & X.1956 & Bosser 10439 (MO-3332245);?frt-Dauphin& s.d.& fl.& Cloisel 4 (P [P00574033]); ibid. lfcf& 16. VI.1926 & fl.& Decary 4111 (G & P [P00553052]). Distribution and ecology. – Knfwn fnly frfm the extreme sfuth-east ff Madagascar fn fixed dunes& frfm?frt Dauphin tf the west ff Ambfvfmbe (?ig. 3).Published as part of Hanes, Margaret M., Mashburn, Brock & Callmander, Martin W., 2022, Transfer of the endemic Malagasy species of Kosteletzkya to Hibiscus and Perrierophytum (Malvaceae), pp. 161-171 in Candollea 77 (2) on page 169, DOI: 10.15553/c2022v772a4, http://zenodo.org/record/761656