Leptolaena gautieri 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: 180-183

publication ID

21380

persistent identifier

http://treatment.plazi.org/id/BDFF90D0-164C-B2F2-3BCB-8AE84E20089C

treatment provided by

Christiana

scientific name

Leptolaena gautieri G. E. Schatz & Lowry
status

sp. nov.

4. Leptolaena gautieri G. E. Schatz & Lowry  , sp. nov.

Haec species a congeneris ad Leptoaenam sensu stricto pertinentibus foliis ovatis vel late ovatis apice acutis usque acuminatis secus costam subtus indumento manifeste vestitis, involucro granulari-farinoso dense ferrugineo plerumque trichomatibus suberectis albidis c. 0.5 mm longis vestito atque petalis 10.5 - 12 mm longis distinguitur.

Typus.Gautier 2920, Madagascar, Prov. Antsiranana, Manongarivo RS, Bekolosy, 14° 02 ' S, 48° 18 ' E, 1240 m, 29 Mar. 1996, fl. (holo-, MO!; iso-, G, P!, TAN!, TEF!).

Trees 3 - 15 m tall, stems initially hirsutetomentose, then glabrescent. Leaves chartaceous, ovate to broadly ovate, 1.1 - 4.8 X 0.5 - 3.7 cm, reduced in the inflorescence, blade glabrous, base obtuse to rounded or subcordate, apex acute to acuminate, the very tip rounded, occasionally somewhat falcate, venation obscurely brochidodromous, secondary veins 9 - 14 per side, midrib flat to slightly raised above, sparsely to moderately hirsute-tomentose, raised below with sparsely to moderately dense sericeous to hirsute indumentum; petiole 2.5 - 4 mm long, 1 mm in diam., canaliculate, moderately to densely hirsute, stipules indistinct, caducous. Inflorescences terminal and axillary from the uppermost leaves, corymbose, 7 - 30 - flowered, the axes densely grey hirsute-tomentose; peduncle 0.1 - 0.5 mm long, indistinct; involucre urceolate, 3 - 3.5 mm tall, 2.5 - 3 mm diam. at apex, tapering evenly to a cuneate base, densely granular ferruginous farinose, usually also with sparse to moderately dense whitish golden partially erect hairs to 0.5 mm, especially towards the base, apical margin with 8 - 10 subequal triangular teeth, 1 mm tall, 0.5 - 1 mm broad at base; sepals exserted 1.5 mm beyond involucre, densely whitish golden hirsute outside, glabrous inside; petals narrowly oblong to oblanceolate, 10.5 - 12 X 1.5 - 2 mm, white to pale yellow, with evident venation upon drying, exserted 7 - 9 mm beyond involucre teeth at anthesis, the apex rounded; stamens 10 - 12, free to the base, filaments 6 - 8 mm long, anthers 0.5 - 0.9 mm tall; ovary ovoid, densely light brown tomentose, style slender, exserted, 6 - 8 mm long, stigma obtriangular to hemispheric, 1 mm in diam. Fruit globose, somewhat asymmetric, with a longitudinal channel and concave apex when dry, c. 2.5 mm tall, 2.5 mm diam., glabrous, entirely enclosed within the persistent sepals and involucre.Fig. 5.

Leptolaena gautieri  is a small to medium-sized tree that occurs in mid-elevation subhumid forest from 800 m to over 1,200 m (Fig. 6). It can be recognized by its ovate to broadly ovate leaves with an acute to acuminate apex and evident indumentum on the midvein below, its densely ferruginous granular farinose involucre that usually also has slightly erect whitish trichomes 0.5 mm long, and petals that are 10.5 - 12 mm long.

Etymology.The species epithet honors Laurent Gautier, our friend and colleague at the herbarium in Geneva, who has significantly advanced our knowledge of the flora of the Manongarivo Special Reserve.

Vernacular names.Anjananjana, Zahana.

Conservation status.With an area of occupancy <2,000 km 2, and only four of eight sub-populations encompassed within the protected areas network, L. gautieri  is assigned a preliminary status of Vulnerable (VU).

Paratypes.Madagascar, Prov. Antsiranana: Gautier & Chatelain 2344, Manongarivo RS, Bekolosy, vallon en amont de la chute, 14° 02 ' S, 48° 18 ' E, 1100 m, 15 June 1994, fl. (G, TAN); Gautier 2361, Manongarivo RS, Bekolosy, 14° 02 ' S, 48° 18 ' E, 800 m, 15 June 1994, fl. (G, MO, P, TAN); Gautier 3510, Manongarivo RS, Ambahatra, cours superieur, 13° 59 ' S, 48° 26 ' E, 1210 m, 8 Mar. 1999 (G, MO); Humbert & Capuron 24147, Mt. Anjenabe, vallee inferieure de l'Androranga, affluent de la Bemarivo aux environs d'Antongondriha, [14° 18 ' S, 49° 45 ' E], 1130 m, 3 - 7 Nov. 1950, fr. (P); Malcomber & Rakotomalala 2608, Manongarvio RS, Bekolosy, 14° 02 ' S, 48° 18 ' E, 1000 - 1200 m, 4 Dec. 1993, fr. (MO, P, TAN); McPherson & van der Werff 16359, Manongarivo RS, above the village of Ambodisakoana, 14° 05 ' S, 48° 20 ' E, 1100 m, 16 Oct. 1994, fr. (MO, P, TAN); McPherson & van der Werff 16396, same locality, 1100 - 1200 m, 18 Oct. 1994, bud (MO, P, TAN); Rakotomalaza 48, Manongarivo RS, Bekolosy, 14° 04 ' S, 48° 17 ' E, 1000 - 1480 m, Apr. 1993, fl. (MO, P, TAN); Rakotozafy 336, plateau de Beankany, Ambanja, 12 Dec. 1963, bud (P, TAN); A. Randrianasolo 307, Marojejy RNI, 14° 29 ' S, 49° 49 ' E, 300 - 800 m, 21 Apr. 1993, fl. (MO, P, TAN); A. Randrianasolo 325, same locality, 500 - 600 m, 22 Apr. 1993, fl. (MO, P, TAN); Reserves Naturelles 2237, Tsaratanana RNI, Ambavala, Marovato, Ambanja, 26 Sep. 1950, fr. (MO, P, TAN); Schatz 3233, Manongarivo RS, Bekolosy, 14° 06 ' S, 48° 17 ' E, 1000 m, 28 Mar. 1991, fl. (K, MO, P, TAN). Prov. Toamasina: Labat et al. 3068, Moramanga, Andasibe, Foret de Maromizaha, 18° 57 ' 56 " S, 48° 27 ' 34 " E, 1020 m, 1 Apr. 1999, fr. (BR, G, K, P, MO, TAN); McPherson 17467, Ambatovy, 18° 51 ' 12 " S, 48° 18 ' 48 " E, 1100 m, 26 Feb. 1998, bud (MO, P, TAN); Perrier de la Bathie 14887, AnalamazaotraPerinet RS, [18° 56 ' S, 48° 26 ' E], Oct. 1920, fl. (P); Rakotomalaza 1046, Ambatovy, 18° 51 ' 07 " S, 48° 18 ' 47 " E, 1100 m, 30 Jan. 1997, bud (MO, P, TAN); Rakotomalaza 1279, same locality, 18° 51 ' 08 " S, 48° 18 ' 59 " E, 990 m, 25 Mar. 1997, bud (MO, P, TAN); Rakotomalaza 1286, same locality, 18° 51 ' 28 " S, 48° 17 ' 43 " E, 26 Mar. 1997, bud (MO, P, TAN); Rakotomalaza 1309, same locality, 18° 51 ' 10 " S, 48° 18 ' 49 " E, 1050 m, 13 May 1997, fl. (MO, P, TAN); Randriambololona et al. 17, Mantady PN, 18° 56 ' S, 48° 26 ' E, 960 m, 27 Oct. 1997, fr. (MO, P, TAN); Service Forestier 10341, Mangorokely, Anosibe, Moramanga, [19° 26 ' S, 48° 12 ' E], 19 May 1954, fl. (P). Prov. Toliara: Humbert 20704, Mt. Vohimavo au Nord d'Ampasimena, bassin de la Manampanihy, [24° 19 ' S, 47° 08 ' E], 830 m, 27 - 28 Mar. 1947, fl. (MO, P).