Abrahamia sambiranensis Randrian. & Lowry, 2017

Randrianasolo, Armand, Lowry II, Porter P. & Schatz, George E., 2017, Taxonomic treatment of Abrahamia Randrian. & Lowry, a new genus of Anacardiaceae from Madagascar, Boissiera 71, pp. 1-152 : 119-120

publication ID

https://doi.org/ 10.5281/zenodo.7618113

DOI

https://doi.org/10.5281/zenodo.7618440

persistent identifier

https://treatment.plazi.org/id/038887C6-FFBD-FFAD-FE43-83651B550856

treatment provided by

Carolina

scientific name

Abrahamia sambiranensis Randrian. & Lowry
status

sp. nov.

29. Abrahamia sambiranensis Randrian. & Lowry View in CoL , spec. nova ( Fig. 26 View Fig ).

Typus: MADAGASCAR. Prov. Mahajanga: Rég. Diana , Ambato forêt classée, c. 40 km N d’Ambanja, 13°26’S 48°33’E, 90-459 m, 23.XI.1996, fr., Randrianaivo et al. 29 (holo-: MO- 6671436 !; GoogleMaps iso-: G!, MO- 6671435 !, P [ P06775160 ]!, TAN [ TAN001998 View Materials ]!). GoogleMaps

Diagnosis

Abrahamia sambiranensis Randrian. & Lowry can be distinguished from other members of the genus by the combination of large (10-19 3 2.5-5.6 cm), coriaceous leaves with numerous (50- 60) distinctly raised secondary veins and a folded apex in dry material, its long petiole (30-65 mm), and its large, glabrous fruits (2.5-3 cm long).

Description

Trees 10-15 m tall, 15-18 cm DBH, bark with white latex; young twigs pubescent towards the tips. Leaves alternate, clustered toward the branch ends; blade oblanceolate or narrowly elliptic to lanceolate, 10-19.4 3 3.2-5.5 cm, coriaceous, apex acuminate, folded in dry material, margin undulate, base cuneate to broadly cuneate, adaxial surface glabrous, often glaucous, abaxial surface sparsely sericeous, more so on midvein, venation craspedodromous, midvein prominent abaxially, secondary veins 50-60 pairs, more or less parallel, 2-4 mm apart, raised on both surfaces, tertiary veins not visible on both surfaces; petiole (20)- 25-58 mm long, 2-3.5 mm in diam., canaliculate on adaxial surface, tomentose. Inflorescence axillary, a panicle, 2-9.5 cm long, very few flowers reaching maturity, axes pubescent. Male flowers 5-merous; pedicel c. 0.5-1 mm long, pubescent; calyx lobes triangular to ovate, 1 3 1 mm, connate at base, adaxial surface glabrous, abaxial surface pubescent; corolla lobes ovate, 2.5 3 1.5 mm, imbricate, adaxial surface glabrous, abaxial surface pubescent; stamens 5, filaments 1 mm long, anthers c. 1 3 1 mm, obloid to ovoid; disk cupuliform, glabrous; rudimentary ovary absent. Female flowers unknown. Fruits 2.5-3 3 1.5-1.8 cm, ellipsoid, pubescent when young, glabrescent, with fine longitudinal striations.

Distribution, ecology and phenology

Abrahamia sambiranensis is restricted to humid forests in the Sambirano region of NW Madagascar and extends into the northern part of the island ( Map 9 View Map 9 ). It flowers in July and August, and fruits have been collected in October and November.

Conservation status

With an EOO of 1,717 km 2, a minimum AOO of 28 km 2, and seven localities, with only a single subpopulation within a protected area (Galoko), A. sambiranensis exists at 7 locations, six of which are subjected to pressure from forest exploitation and land clearing; it is therefore assigned a preliminary conservation status of “Vulnerable” [VU B1ab(iii)+2ab(iii)] using the IUCN Red List Categories and Criteria ( IUCN, 2012).

Notes

Abrahamia sambiranensis vegetatively resembles A. elongata , but differs by having leaves that lack tertiary venation (vs present and raised on both surfaces in A. elongata ) and whose apex is usually folded in pressed material (vs flat), and by its fruits that are glabrescent when mature (vs glabrous in A. elongata ).

Paratypi

MADAGASCAR. Prov. Antsiranana: Rég. Diana, Ambilomangodra , 13°02’42’’S 49°09’11’’E, 50 m, 14.VII.2005, fl., Randrianaivo et al. 1201 ( CNARP, MO, P, TAN) GoogleMaps ; forêt de Kalabenono, 13°37’27’’S 48°40’05’’E, 369 m, 10.XI.2006, fr., Razafitsalama et al. 1064 ( G, MO, P, TAN) GoogleMaps ; Galoko, [13°33’45’’S 48°45’00’’E], 29.VII.1955, y. fr., Service Forestier 15748 ( P, TEF) GoogleMaps ; forêts à l’E d’Ampondrabe, 28.X.1954, fr., Service Forestier 18931 ( MO, P [2 sheets]) ; massif de l’Andavakoera , N d’Angodromena, [13°06’30’’S 49°18’30’’E], 1.X.1958, fr., Service Forestier 18947 ( G, MO, P [2 sheets], TEF) GoogleMaps ; Ampandrikoera , 12.X.1951, ster., Service Forestier 181-R-64 ( P).

CNARP

CNARP

TEF

TEF

G

Conservatoire et Jardin botaniques de la Ville de Genève

P

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

TAN

Parc de Tsimbazaza

MO

Missouri Botanical Garden

TEF

Centre National de la Recherche Appliquée au Developement Rural

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