Abrahamia lokobensis Randrian. & Lowry

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: 93-95

publication ID

978-2-8277-0087-5

persistent identifier

http://treatment.plazi.org/id/038887C6-FF97-FF8A-FE43-83651FB70C12

treatment provided by

Carolina

scientific name

Abrahamia lokobensis Randrian. & Lowry
status

spec. nova

19. Abrahamia lokobensis Randrian. & Lowry   , spec. nova (Fig. 16).

Typus: MADAGASCAR. Prov. Antsiranana: Rég. Diana, RNI Lokobe , 13°24’40’’S 48°18’50’’E, 40-80 m, 24.XI.1994, fr., Antilahimena 198 (holo-: MO-6671433!; iso-: G!, K!, NY!, P [ P06775168]!, TAN [ TAN001991 View Materials ]!) GoogleMaps   .

Abrahamia lokobensis Randrian. & Lowry   can be distinguished from its congeners by its large (14.6-23.9 3 4.8-7.2 cm), chartaceous to subcoriaceous, oblanceolate leaves and its obovoid fruit borne in a terminal infructescence.

Trees c. 8-25 m tall, 10-80 cm DBH, bark with white latex; young twigs lenticellate, glabrous. Leaves opposite to subopposite or alternate; blade oblanceolate, 14.6-23.9 3 4.8-7.2 cm, chartaceous to subcoriaceous, apex short acuminate, retuse or sometimes emarginate, margin entire, base cuneate, sometimes asymmetric, adaxial surface glabrous, abaxial surface nearly glabrous except sparsely scabrous indument on midvein or around it, venation craspedodromous, midvein prominent abaxially, secondary veins c. 30-45 pairs, 2-10 mm apart, forming wide angle with the midvein, raised on both surfaces, tertiary veins visible on both surfaces; petiole 13-30.5 mm long, 1.5-3 mm in diam., canaliculate on adaxial surface, very often pubescent, glabrescent or sometimes glabrous. Inflorescence terminal or pseudoterminal, a panicle, 2.5 3 7 cm, with buds at very early stage of development, dark brown pubescent. Flowers unknown. Fruits 2-3.1 3 1-1.5 cm, obovoid, pale green, glabrous, with longitudinal striations.

Abrahamia lokobensis   is only known from northwestern Madagascar; it occurs at elevations between 10 and 100 m at the Lokobe reserve on the island of Nosy-be, and up to 1200-1400 m in Tsaratanana national park (Map 5). Flowers have been collected in August and fruits in November.

Abrahamia lokobensis   has an EOO of 3,124 km 2 and a minimum AOO of 16 km 2, with two subpopulations occurring within a protected area (Lokobe and Tsaratanana) whereas the other subpopulation was collected in the area of Maromandia where future decline is expected in terms of quality of habitat, and thus exists at three locations with respect to the threat of habitat degradation. It has therefore been assigned a preliminary status of “Endangered” [EN B1ab(iii)+2ab(iii)] using the IUCN Red List Categories and Criteria ( IUCN, 2012).

Abrahamia lokobensis   most closely resembles A. sambiranensis   but can be distinguished by its smaller number of secondary veins (35-45 vs 50-60), its tertiary venation that is visible on both leaf surfaces (vs not visible), its shorter petiole (13-19 vs (20-) 25-65 mm), and exclusively terminal (vs axillary) infructescence.

94 Paratypi

MADAGASCAR. Prov. Antsiranana: Rég. Diana, Lokobe RNI, 13°25’S 48°18’E, 10-100 m, 14.XI.1996, fr., Antilahimena et al. 315 ( G, K, MO, P, TAN) GoogleMaps   ; ibid. loco, [13°25’S 48°19’E], 13-15.III.1964, fr., Service Forestier 23459 ( MO, P) GoogleMaps   ; Maromandia, Ambanja , [14°12’S 48°05’E], 15.VIII.1952, ster., Service Forestier 64-R-152 ( P [2 sheets]) GoogleMaps   ; Tsaratanana RNI, Ambinany Beangona , 14°01’S 48°47’E, 1200-1400 m, 1.VIII.2000, y. bud, Antilahimena et al. 533 ( G, K, MO, NY, P, TAN) GoogleMaps   .

Diagnosis

Description

Distribution, ecology and phenology

Conservation status

G

Conservatoire et Jardin botaniques de la Ville de Genève

K

Royal Botanic Gardens

NY

William and Lynda Steere Herbarium of the New York Botanical Garden

P

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

TAN

Parc de Tsimbazaza

MO

Missouri Botanical Garden