Leptolaena raymondii G. E. Schatz & Lowry , Schatz, G. E., Lowry, P. P. & Wolf, A. - E., 2001

Schatz, G. E., Lowry, P. P. & Wolf, A. - E., 2001, Endemic families of Madagascar. VII. A synoptic revision of Leptolaena Thouars sensu stricto (Sarcolaenaceaea)., Adansonia 23, pp. 171-189: 186-188

publication ID

21380

persistent identifier

http://treatment.plazi.org/id/995BFDBE-E3BC-0330-B986-8BCC2C7E9FC1

treatment provided by

Christiana

scientific name

Leptolaena raymondii G. E. Schatz & Lowry
status

sp. nov.

8. Leptolaena raymondii G. E. Schatz & Lowry  , sp. nov.

Haec species a congeneris ad Leptoaenam sensu stricto pertinentibus foliis falcatis apice longe cuspidatis marginibus valde revolutis subtus indumento persistente ex trichomatibus brevibus adpressis etiam saepe trichomatibus suberectis> 1 mm longis constante distinguitur.

TYPUS.Randrianasolo & Ranaivojaona 638, Madagascar, Prov. Toamasina, Dist. Fenerive-Est, Mahatsara STF, 17° 38 ' S, 49° 29 ' E, 5 m, 10 Nov. 1999, fl. (holo-, MO!; iso-, G!, K!, P!, TAN!).

Trees 5 - 10 m tall, to 20 cm dbh, stems short sericeous-tomentellous. Leaves chartaceous, ovate to broadly ovate, usually strongly falcate, 2 - 4.5 X 0.7 - 2.3 cm, glabrous above, appressed short sericeous below often mixed with slightly erect trichomes> 1 mm long, sometimes subglabrescent, base strongly asymmetrical with one side obtuse to rounded and the other side cuneate, margins strongly revolute, apex long cuspidate, the very tip rounded, venation obscurely brochidodromous, secondary veins 8 - 10 per side, midrib slightly raised above,glabrous, raised below, moderately densely sericeous; petiole 2 - 4 mm long, 0.7 - 0.8 mm in diam., canaliculate, densely sericeous, stipules indistinct, caducous. Inflorescences terminal and axillary from the uppermost leaves, corymbose, 9 - 20 - flowered, axes densely gray hirsute-tomentose; peduncle 0.5 - 1 mm long, indistinct to somewhat distinct; involucre urceolate, base acute to obtuse, 2.5 - 3.5 mm tall, 2.5 - 3 mm diam. at apex, densely granular ferruginous farinose and also with moderately dense white appressed trichomes to 0.3 mm long, apical margin with 8 - 10 unequal triangular to narrowly triangular teeth, 1 - 1.3 mm tall, 0.3 - 1 mm broad at base; sepals exserted 1 mm beyond involucre, 3 X 3 mm, very widely obovate, apex rounded, strongly inrolled, densely whitish hirsute outside, glabrous inside; petals narrowly oblong to oblanceolate, 8 - 9 X 2 - 3 mm, white to pale yellow, glabrous, exserted 4 - 5 mm beyond involucre, with evident venation upon drying, the apex rounded; stamens (10 -) 11 (- 12), free, filaments 4.5 - 5.5 mm long, anthers oblong 0.6 - 0.9 X 0.3 mm; ovary obovoid, 1 X 0.8 mm, densely whitish hirsute, style slender, 5 - 6 mm long, exserted 4 mm above involucre, sparsely whitish velutinous towards the base, stigma capitate, 1.2 - 1.5 mm diam. Mature fruit unknown.Fig. 8.

Leptolaena raymondii  is a small to mediumsized tree known only from Mahatsara Station Forestiere (Fig. 6). It is the only species of Leptolaena  sensu stricto with persistent indumentum throughout the lower surface of the leaf blade, consisting of both short appressed trichomes and often longer partially erect trichomes greater than 1 mm long. The leaves of this species are further characterized by their strongly revolute margins.

Etymology.The species epithet honors our friend and colleague Raymond Rabevohitra, Head of the FOFIFA herbarium (TEF), who has contributed so much to our knowledge of Madagascar's woody flora.

Vernacular names.Amaninombilahy, Anjananjana.

Conservation status.With an area of occupancy <100 km 2, and only a single known population that is not included within the current protected areas network, L. raymondii  is assigned a preliminary status of Critically Endangered (CR). Along with L. delphinensis  , the status of L. raymondii  demonstrates the urgent need for additional protection of littoral forest along the East coast of Madagascar.

PARATYPES.MADAGASCAR, Prov. Toamasina: Rabenantoandro et al. 562, Mahatsara STF, 17° 38 ' 13 " S, 49° 29 ' 03 " E, 2 m, 7 July 2001, bud (G, K, MO, P, TAN); Razafindramora et al. 150, same locality and date, bud (K, MO, P, TEF); Service Forestier 32648, Marovovonana, Mahatsara STF, [17° 38 ' S, 49° 29 ' E], 15 June 1985, bud (MO, TEF); Service Forestier 34104, Mahatsara STF, [17° 38 ' S, 49° 29 ' E], 19 Oct. 1990, fl. (MO, TEF); Service Forestier 34407, Andranotsara, Mahatsara STF, [17° 38 ' S, 49° 29 ' E], 1 Oct. 1992, bud (G, K, MO, P, TEF, WAG); Service Forestier 34554, point d'essai, Mahatsara STF, [17° 38 ' S, 49° 29 ' E], 1 Dec. 1993, bud, fr. (MO, TEF); Service Forestier 35141, same locality, 30 Aug. - 4 Sep. 1999, bud (MO, TEF).