Transfer of the endemic Malagasy species of Kosteletzkya to Hibiscus and Perrierophytum (Malvaceae) Author Hanes, Margaret M. Author Mashburn, Brock Author Callmander, Martin W. text Candollea 2022 2022-09-14 77 2 161 171 http://dx.doi.org/10.15553/c2022v772a4 journal article 10.15553/c2022v772a4 2235-3658 7616567 Perrierophytum malvocoeruleum (Hochr.) M.M. Hanes & Callm. , comb. nov. (F ig. 4B). Kosteletzkya malvocoerulea Hochr. in Annuaire Conserv. Jard. Bot. Genève 20: 100. 1917 . Holotypus : MADAGASCAR . Aeg. Haute Matsiatra [Prov. Fianarantsoa ]: W du massif d’Andringitra , [ 22°13'S 46°55'E ], 1000 m , IX.1911 , fl., Perrier de la Bâthie 5467 [as “ 69 ” at G ] ( G [ G00014375 ]!; iso-: P [ P00037094 , P00037095 ]!) . Vernacular names. – “Tsietilahy” ( Rakotovao 801 ); “Hafotra” ( Réserves Naturelles 2266 ). Distribution and ecology. – Known from rocky summits in montane ericoid thicket from 1000–2650 m ; Andringitra , valleys of Riambava and Antsifotra (F ig. 3). Conservation status. – Perrierophytum malvocoeruleum has been collected from six subpopulations in south-central Madagascar , three of which are within Andringitra National Park. No collections are known to have been made outside of the park in the past 54 years, and the most recent of these is Haine 200 from SW of Ambalavao. With all collections included, the EOO of P. malvocoeruleum is estimated to be 739 km ², and the AOO is estimated to be 32 km ². However, given recent habitat loss in this region outside of the park, and the lack of recent collections, we infer a decline in the number of subpopulations. Thus, if we do not include these subpopulations in our assessment, P. malvocoeruleum has an AOO of, at most, 8 km ². In addition, collection details for specimens thought to occur within the national park are vague, and so we infer a single location within the park. Even though this one location is within a protected area, loss due to fire or illegal incursions of forest clearing and/or grazing animals is still possible. Given these measures and the inferred recent decline in number of subpopulations from three to one, P. malvocoeruleum can be assessed as “Critically Endangered” [CR B2ab(i, ii, iii, iv, v)]. Table 1. – Comparison of morphological characters between the six species of Perrierophytum Hochr. treated herein. Characters diagnostic for a species are in bold type.
P. macranthum P. madagascariense P. malvocoeruleum P. reflexiflorum P. thouarsianum P. velutinum
Habit shrub; leaves grouped with flowers at branch apex perennial herb; flowers axilary, solitary shrub; flowers grouped at summit shrub; flowers axilary shrub; leaves grouped with flowers at branch apex shrub; flowers grouped at summit
Leaf width x length [mm] 65 x 20–80, tomentose, sharp discolored points on leaf teeth 35 x 20, nearly glabrous 30 x 15, tomentose 27 x 19, tomentose 80 x 73, tomentose 20, tomentose
Stipule length [mm] 8 , filiform, densely pubescent, deciduous unknown 4, filiform, deciduous 10, deciduous 15, deciduous 4, deciduous
Petiole length [mm] 10–15 15–20 5– 37 7–16 5–45 5–20
Peduncle length [mm] 30 20–30 20 15–20, articulated towards apex 3–9, articulated half way 15–20
Epicalyx bract shape filiform linear, almost filiform filiform, free ovate, cordate, with long acuminate tips, free triangular, fused at base filiform
Number of epicalyx bracts 15 5 to 6 10 5 to 6 4 to 6 10 to 12
Calyx lobe length [mm] 15 6 8 9 9 7–9
Calyx shape free infondiuliforme’, fused halfway cupuliform, fused at base free cupuliform, fused halfway cupuliform, fused halfway
Corolla color Flower shape pale violet, dark purple veins cupuliform unknown cupuliform mauve flat red reflexed rose, mauve cupuliform rose, blue violet cupuliform
Petal shape ovate obovate ovate, to gently bilobed at apex deeply bilobed at apex ovate ovate
Staminal column length [mm] 25–32 2–3 2–3.5 10 6 4–5
Notes – Perrierophytum malvocoeruleum has solitary, axillary flowers on long, delicate peduncles that are clustered at branch tips. F lowers of this species have a unique combination of a cupuliform calyx and filiform epicalyx with an open, flat floral architecture with gently notched petals. Perrierophytum malvocoeruleum is noted as a medicinal plant. The leaves and branches are used to treat maladies of the skin (“la gale”) ( Rakotovao 801 ). We consider the specimen deposited at G to be the holotype. Additional specimens examined. – MADAGASCAR . Aeg. Haute Matsiatra [Prov. Fianarantsoa ]: rocailles SO de l’Ivangomena ( Pic Humbert ), massif d’Andringitra , 16.X.1934 , fl., Heim s.n. ( P [ P 00569770 , P 00569771 ]) ; massif d’Andringitra , vallée de la Riambava , 1924, fl., Humbert 3802 ( G , P [ P00569768 ]) ; massif d’Andringitra , IV.1911 , fl., Perrier de la Bâthie 13750 ( P [ P 00569766 , P 00569767 ]) ; ibid. loco, 22°10'S 46°56'E , 1650 m , 8.IV.1997 , fl., Rakotovao 801 (MO-5340237, P [ P 00569764 ]) ; ibid. loco, 22. VI .1948 , fl., Réserves Naturelles 1409 ( G , P [ P 00569764 ]) ; ibid. loco, 18.VII.1952 , fl., Réserves Naturelles 4781 ( P [ P 00569761 , P 00569762 ]) . Aeg. Ihorombe [Prov. Fianarantsoa ]: 12 km SO Ambalavao , 67 km S of F ianarantsoa, 29.XII.1968 , Haine 200 ( K ) ; Distr. Ambalavao , Vohitsaoka , 23.II.1960 , fl., Rabevazaha 189RN ( P ) ; Antaranomby , 26.VIII.1950 , fl., Réserves Naturelles 2266 ( G , P [ P 00569763 , P 00553056 ]) ; Distr. Ivohibe , Antambohobe , 22.X.1953 , fl., Réserves Naturelles 5865 ( P [ P00569760 ]) ; Distr. Ambalavao , Vohitsaoka , 8.II.1961 , fl., Réserves Naturelles 11673 ( P [ P00574879 ]) .