Beguea ankeranensis G.E. Schatz & Lowry,

George E. Schatz, Roy E. Gereau & Porter P. Lowry Ii, 2017, A revision of the endemic Malagasy genus Beguea (Sapindaceae), Candollea 72, pp. 45-65: 47

publication ID

http://doi.org/ 10.15553/c2017v721a6

persistent identifier

http://treatment.plazi.org/id/BF6C6E20-FF8A-FF9C-FF06-163E22E6F9E4

treatment provided by

Plazi

scientific name

Beguea ankeranensis G.E. Schatz & Lowry
status

 

1. Beguea ankeranensis G.E. Schatz & Lowry  , spec. nova

( Fig. 1View Fig. 1, 2View Fig. 2 A).

Typus: MADAGASCAR. Prov. Toamasina: Atsinanana Region, Brickaville, Anjahamamay, Anivoranokely, Ankerana forest , 18̊24’21’’S 48̊48’18’’E, 700 m, 19.I.2012, fl., Antilahimena 7978 (holo-: MO-6704230!;GoogleMaps  iso-: G [G00341688]!, K!, P [P00580357]! TAN).

Haec species a congeneris foliorum petiolo rhachideque indumento aureobrunneo tomentulosis, foliolis 6 ad 8 in sicco complanatis apice acute acuminatis, pedicellis c. 1 mm longis atque antheris 2.2-2.5 mm longis distinguitur.

Tree c. 15 m tall; stems densely golden brown tomentulose. Petioles 2.6-4 cm, densely golden brown tomentulose. Leaves with 6-8 subopposite to alternate leaflets; rachis 3.8-7 cm, keeled above, golden brown tomentulose; petiolule 2.5-3 mm, golden brown tomentulose; leaflet blade 2.8-7 × 1.2-2.2 cm, elliptic, papyraceous to subcoriaceous, flat in pressed material, glabrous and only slightly glossy above, sparsely light brown tomentulose on midvein and secondary veins below, base weakly to markedly asymmetrical, acute to nearly decurrent, margins minutely thickened, not revolute, apex distinctly acuminate, the acumen acute, midvein distinctly raised and knife-like above and below, secondary veins (8-)10-13 per side, flat to slightly impressed above, raised below, tertiary venation obscure above, slightly raised and evident below. Inflorescence axis 16-19 cm long, c. 1 mm in diam., unbranched, dark chocolate brown, densely golden brown tomentulose; bracts c. 1 mm, narrowly triangular, adaxially concave; pedicels c. 1 mm, c. 0.8 mm in diam., densely golden brown tomentulose. Male flowers with a shallowly cupulate, (4-)5-lobed calyx, the lobes broadly triangular, c. 1 × 1.2 mm, acute, densely golden brown tomentulose outside, densely golden setaceous inside; stamens 8, filaments 1-3 mm, glabrous, anthers 2.2-2.5 × c. 0.8 mm, ellipsoid; disc and pistillode densely golden setaceous, the trichomes to 0.5 mm. Female flowers not seen. Fruit not seen.

Conservation status. – Known only from a single collection from well within an intact forest block of the newly designated Corridor Ankeniheny Zahamena PA ( Fig. 3View Fig. 3), and lacking any additional information on population size, B. ankeranensis  is assigned a provisional status of “Least Concern” [LC] using the IUCN Red List Criteria ( IUCN, 2012), with the caution that this status is highly dependent on continued effective protection.

Notes. – Beguea ankeranensis  is known only from the type collection in humid forest at Ankerana ( Fig. 3View Fig. 3), which is included within the recently decreed Corridor Ankeniheny Zahamena PA. It can be easily distinguished from the two species most similar morphologically ( B. birkinshawii  and B. turkii  ) by its leaflets with a long-acuminate apex and an acute acumen (vs acute to short acuminate apex and rounded to retuse acumen), short pedicels c. 1 mm long (vs 2.5-4 mm long), and large anthers 2.2-2.5 mm long (vs only 1 mm long) ( Fig. 1View Fig. 1, 2View Fig. 2 A).