Psiadia madagascariensis (Lam.) DC.

3. Psiadia madagascariensis (Lam.) DC. View in CoL

( Fig. 3)

Prodromus systematis naturalis regni vegetabilis 5: 320 ( Candolle 1836). — Conyza madagascariensis Lam., Encyclopédie View in CoL méthodique. Botanique 2: 85 ( Lamarck 1786). — Baccharis madagascariensis (Lam.) Pers. View in CoL , Synopsis plantarum 2: 423 ( Persoon 1807). — Typus: Madagas - car • s.l.; s.d.; P.Commerson s.n.; holotype:P-JU[P06986451]! ( Fig. 3). Microglossa altissima DC. , Prodromus systematis naturalis regni vegetabilis 5: 320 ( Candolle 1836). — Nidorella altissima (DC.) Benth. & Hook.f. ex Klatt, Annalen des Kaiserlich-Königlichen Naturhistorischen Hofmuseums View in CoL 7: 296 ( Klatt 1892). — Psiadia altissima (DC.) Benth. & Hook.f. ex B.D. Jacks. View in CoL , Index Kewensis 2: 640 ( Jackson 1894), syn. nov. — Typus: Madagascar • “Province d’Emirne”; 1835; W. Bojer 5; holotype: G-DC[G00455755]! Psiadia stenophylla Baker View in CoL , Journal of the Linnean Society, Botany 22: 490 ( Baker 1887). — Typus: Madagascar • Central Madagascar; s.l.; s.d.; R. Baron 3549; lectotype ( designated here): K[K000273973] image!; isolectotypes: BM[BM000903966] image!, P[P00435635, P00435636] images!

Psiadia decurrens Klatt, Botanische Jahrbücher View in CoL für Systematik, Pflanzengeschichte und Pflanzengeographie 12 (Beibl. 27): 23 ( Klatt 1890). — Typus: Madagascar • Vakinankaratra Region [Prov. Antananarivo], “Nord-Betsiléo, Sirabé”; VIII.1880; J.M. Hildebrandt 3541; holotype: GH[GH02290259] image!; isotypes: BM[BM000903967] image!, G[G00002313, G00393789]!, JE[JE00006214] image!, P[P00435616, P00435617] images !

ICONOGRAPHY. — Drake del Castillo (1903: pl. 483 sub. Psiadia altissima ; pl. 484 sub. P. decurrens ); Humbert (1960: 305, fig. LXI: 1-24, sub. P. altissima ).

DISTRIBUTION. — Madagascar (widespread) and îles Éparses (Europa and Juan de Nova).

NOTES

The type of Conyza madagascariensis , kept at P-JU, shows a flowering branch of an erect shrub that perfectly matches the concept hitherto known under the name P. altissima . The specimen bears a modern determination label by unknown hand with the identification “ Psiadia altissima ”.

The name Psiadia madagascariensis has priority over the widely used P. altissima ( Humbert 1960; Strijk et al. 2012; POWO 2025). Humbert (1960) misinterpreted Candolle’s name P. madagascariensis as being heterotypic to Lamarck’s Conyza madagascariensis , which is its basionym. In turn, it seems that Candolle misinterpreted the concept of P. madagascariensis since the single specimen in G-DC labelled as such (G00455808) corresponds to P. sessilifolia (see below) and the taxonomic entity named Conyza madagascariensis by Lamarck was described by himself as Microglossa altissima DC.

The intended combinations by Bentham & Hooker f. (1873) of Microglossa altissima in both Psiadia and Nidorella are to be treated as not validly published (see ICN Art. 35.2 Ex. 6.).