Vitex barorum (Humbert) Callm. & Phillipson

Callmander, Martin W. & Phillipson, Peter B., 2018, New combinations and typifications in Vitex (Lamiaceae) from Madagascar, Candollea 73 (1), pp. 131-136: 132-133

publication ID 10.15553/c2018v731a14

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Vitex barorum (Humbert) Callm. & Phillipson

comb. et stat. nov.

Vitex barorum (Humbert) Callm. & Phillipson   , comb. et stat. nov.

Ξ Vitex betsiliensis subsp. barorum Humbert   in Notul. Syst. (Paris) 8: 23. 1939.

Lectotypus (designated here): MADAGASCAR. Prov. Fianarantsoa: vallée d’Ihosy , 850 m, 29.VII.1928, Humbert & Swingle 4908 ( P [ P00573440]!, isolecto-: B [ B100030550] image seen, BR [ BR0000005162642] image seen, G [ G00096014]!, K, MO-2160579!, NY [ NY00138422] image seen, P [ P00440339, P00440340]!, PRE, TAN, WAG [ WAG0251822 View Materials ] image seen)   . Syntypi: MADAGAS- CAR. Prov. Fianarantsoa: env. d’Ihosy , [22°23’S 46°07’E], VI.1933, Perrier de la Bâthie 19267 ( P [ P04398730, P04398731, P00440341, P00573443]!) GoogleMaps   . Prov. Toliara: vallée moyenne du Mandrare, près d’Anadabolava , Mont Vohirotsy , [24°16’S 46°43’E], 850 m, XII.1933, Humbert 12649 ( G [ G00341742]!, P [ P00440342]!) GoogleMaps   .

Notes. – HUMBERT (1939: 24) considered this taxon to be a subspecies of V. betsiliensis   , distinct from the typical plant, stating: “…. adaptée à un climat plus chaud de moindre altitude [adapted to a hotter climate and lower altitude]”. Vitex barorum   can be easily distinguished from V. betsiliensis   by its smaller flowers - calyx 5-6 mm long (incl. 1 mm lobe) and corolla c. 10 mm long vs. calyx 8-12 mm incl. a 2 mm lobe and corolla 12-22 mm long; its white finely canescent indument on its lower leaf surface between the secondary veins and on the calyx between the nerves, and has a predominately salmon-pink papillate indument on the lower leaf midrib and secondary veins, petiole, inflorescence and young stem, while V. betsiliensis   has a uniform, very dense, white, lanate indument covering the lower leaf surface, petiole, inflorescence and young stem. Vitex barorum   is found on rocky slopes and inselbergs in the south and south-east of Madagascar while V. betsiliensis   is endemic to the marble of Ibity and Itremo massifs.

All three available syntype collections are well representative of the species, however we select a sheet of Humbert & Swingle 4908 in Paris as the lectotype, since it has more duplicates distributed to different herbaria.

Conservation status. – Vitex barorum   is known from 12 locations of which only one, the newly established Vohidava- Betsimalaho Reserve, is encompassed by the protected area network. Here the species has been collected just once, in 2007 (Randriatsivery 270) ”. All of the other collections date back to the sixties or the seventies and come from fragmented midelevation forest patches on rock outcrops in southern highlands, that are now highly threatened by over-grazing, wild fires and over-exploitation. With an EOO of c. 15,000 km 2 and an AOO of 56 km 2, V. barorum   is therefore assigned a preliminary IUCN conservation status of “Vulnerable” [VU B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v)].

Specimens examined. – MADAGASCAR. Prov. Fianarantsoa: premier étage de la Brioche ou “Fandrana”, PK 545 à 64 km d’Ihosy à Ambalavao , [22°01’S 46°22’E], 1200 m, 17. V.1971, Cremers 1545 ( P) GoogleMaps   ; Mont Vohipolaka au N de Betroka , versant NW, [23°08’S 46°05’E], XI.1933, Humbert 11632 ( G, MO, P [2 sheets], TEF) GoogleMaps   ; Haute Matsiatra, Ingaro [21°36’S 46°22’E], VI.1969, Morat 3321 ( MO, P, TAN) GoogleMaps   ; La Brioche: rocher entre Ihosy et Ambalavao , [22°01’45”S 46°22’10”E], 1200 m, VI.1969, Morat 3353 ( MO, P) GoogleMaps   ; Massif Ingaro, Ambalavao , [21°36’S 46°22’E], 900 m, 12.II.1955, Service Forestier 13743 ( P, TEF) GoogleMaps   ; Ambandroja, Ambandrozana, [21°59’30”S 46°36’30”E], 900- 1360 m, 22.VII.1954, Service Forestier 14490 ( G, MO, P, TEF) GoogleMaps   ; massif de l’Ifandana, entre Ankaramena et Ihosy , [22°01’00”S 46°22’30”E], 1300-1400 m, 7.X.1964, Service Forestier 23506 ( P, TEF) GoogleMaps   . Prov. Toliara: vallée moyenne du Mandrare, près d’Anadabolava, Mont Vohirotsy (sommet), [24°38’S 46°26’E], 800 m, XII.1933, Humbert 12648 ( P) GoogleMaps   ; Amboasary Sud, Mahaly, Anadabolava, 24°14’36”S 46°17’01”E, 813 m, 27.X.2007, Randriatsivery 270 ( MO, P, TEF) GoogleMaps   ; Anadabolava (Moyen Mandrare), [24°12’S 46°19’E], IX.1953, Service Forestier 8538 ( P [2 sheets], TEF) GoogleMaps   ; Vohidava, près Anadabolava (Moyen Mandrare), [24°09’S 46°15’E], 700-900 m, 6.II.1963, Service Forestier 22598 ( MO, P, TEF) GoogleMaps   ; Lalanandro, [22°19’S 46°07’E], 6.XI.1967, Service Forestier 27873 ( G, MO, P, TEF) GoogleMaps   .


Museum National d' Histoire Naturelle, Paris (MNHN) - Vascular Plants


Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet


Embrapa Agrobiology Diazothrophic Microbial Culture Collection


Conservatoire et Jardin botaniques de la Ville de Genève


Royal Botanic Gardens


William and Lynda Steere Herbarium of the New York Botanical Garden


South African National Biodiversity Institute (SANBI)


Parc de Tsimbazaza


Wageningen University


Mykotektet, National Veterinary Institute


Royal British Columbia Museum - Herbarium


Nanjing University


Missouri Botanical Garden


Centre National de la Recherche Appliquée au Developement Rural














Vitex barorum (Humbert) Callm. & Phillipson

Callmander, Martin W. & Phillipson, Peter B. 2018

Vitex betsiliensis subsp. barorum

Humbert 1939: 23