Leptolaena delphinensis 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: 178-180

publication ID

21380

persistent identifier

http://treatment.plazi.org/id/1A4CE845-80D2-B608-322A-B822007BC952

treatment provided by

Christiana

scientific name

Leptolaena delphinensis G. E. Schatz & Lowry
status

sp. nov.

3. Leptolaena delphinensis G. E. Schatz & Lowry  , sp. nov.

Haec species a congeneris ad Leptoaenam sensu stricto pertinentibus foliis glabris apice obtusis usque rotundatis, involucro urceolato granulari dense ferrugineo c. 3 mm alto atque sepalis involucrum c. 1.5 mm excedentibus distinguitur.

Typus.McPherson, Dumetz & Rabevohitra 14222, Madagascar, Prov. Toliara, North of Fort Dauphin near Ste. Luce (Manafiafy), NW of village in forest remnant on sand, 24° 47 ' S, 47° 10 ' E, 20 m, 22 Oct. 1989, fl. (holo-, MO!; iso-, P!, TAN!, TEF!).

Shrubs to trees 3 - 10 m tall, trunk to 20 cm in diam., stems glabrous. Leaves chartaceous, narrowly to broadly elliptic, 1.8 - 5.2 X 0.8 - 3.2 cm, reduced in the inflorescence, glabrous, base obtuse to rounded, margins slightly to strongly revolute, apex rounded to occasionally obtuse, venation obscurely brochidodromous, secondary veins (8 -) 11 - 13 per side, midrib flat above, raised below; petiole 3 mm long, c. 1 mm diam., canaliculate, glabrous, stipules indistinct, caducous. Inflorescences terminal, corymbose, 10 - 50 - flowered, the axes glabrous; peduncle 0.7 - 0.8 mm long, involucre urceolate, 3 mm tall, 2.5 mm diam. at apex, densely granular ferruginous farinose, apical margin with 8 - 9 subequal triangular teeth, 0.5 mm tall, 0.4 mm broad at base; sepals exserted 1 - 1.5 mm beyond involucre, densely white hirsute outside,glabrous to sparsely hirsute inside; petals narrowly elliptic, 7 X 2.5 mm, white fading to yellow, exserted 6 mm beyond involucre at anthesis; stamens 10, free to the base, filaments c. 7 - 8 mm long, anthers 0.8 mm tall; ovary conic-ovoid, densely whitish tomentose, style slender, exserted, c. 7 - 8 mm long, stigma hemispheric, with 3 weakly differentiated lobes, c. 0.8 mm across. Fruit globose to widely ovoid, somewhat asymmetric, with a longitudinal channel and concave apex when dry, c. 3 - 4 mm tall, 2 - 3 mm diam., glabrous, entirely enclosed within the persistent sepals and involucre.Fig. 4.

Leptolaena delphinensis  is a shrub to small tree, and is restricted to humid littoral forest on sand near Ft. Dauphin in SE Madagascar (Fig. 2). It can be distinguished by its leaves with an obtuse to rounded apex, small, urceolate, densely granular ferruginous involucre 3 mm tall, and sepals that are exserted 1 - 1.5 mm beyond the involucre.

Vernacular names.Fotobavy, Fotoda, Fotondahy, Fonto, Fotona.

Conservation status.With no sub-populations recorded from within the current protected areas network, and thus a predicted population reduction of> 80 % in the next three generations, L. delphinensis  is assigned a preliminary status of Critically Endangered (CR). Along with L. raymondii  , the status of L. delphinensis  demonstrates the urgent need for additional protection of littoral forest along the East coast of Madagascar.

Paratypes.Madagascar, Prov. Toliara: Decary 10064, Vinanibe, [25° 03 ' S, 46° 56 ' E], 10 July 1932, fl. (P); Dumetz et al. 683, Mandena STF, 24° 57 ' S, 47° 00 ' E, 0 - 10 m, 17 Apr. 1989, bud (K, MO, P, TAN, TEF); Humbert 5955, environs de Fort Dauphin, sables entre le pic St. Louis et la mer, [25° 03 ' S, 47° 00 ' E], 20 Sep. - 6 Oct. 1928, fl. (MO, P); Jacquemin 1149, Mandena STF, [24° 57 ' S, 47° 00 ' E], 8 Dec. 1972, fr. (MO, P); Johnson WII 37, Mandena STF, [24° 57 ' S, 47° 00 ' E], 16 July 1963, bud (P); McPherson et al. 14142, Mandena STF, low forest on sand, 24° 57 ' S, 47° 00 ' E, 25 m, 17 Oct. 1989, fl. (K, MO, P, TAN, TEF); McPherson & Dumetz 14665, Mandena STF, 24° 57 ' S, 47° 00 ' E, 25 m, 7 Dec. 1989, fr. (MO, TAN); McPherson et al. 14835, Ste. Luce (Manafiafy), 24° 47 ' S, 47° 10 ' E, 20 m, 18 Jan. 1990, fr. (MO, TAN); Rabenantoandro et al. 272, Mandena STF, 24° 57 ' 11 " S, 47° 00 ' 16 " E, 5 m, 27 Sep. 2000, fl. (G, K, MO, P, TEF); Rabenantoandro et al. 308, Mandena STF, 24° 55 ' 20 " S 47° 02 ' 23 " E, 0 - 50 m, 4 Oct. 2000, fl. (G, K, MO, P, TEF); Rabevohitra 2053, Ste. Luce (Manafiafy), foret au N. du village, 24° 46 ' S, 47° 09 ' E, 10 m, 20 Oct. 1989, fl. (MO, P, TAN, TEF); Rabevohitra & Rabenantoandro 3701, Mandena STF, 24° 57 ' 03 " S 47° 00 ' 03 " E, 5 m, 4 Oct. 2000, fl. (G, K, MO, P, TEF); Service Forestier 399, Mandena STF, foret littorale, [24° 57 ' S, 47° 00 ' E], 16 Feb. 1949, fr. (P, TEF); Service Forestier 8207, same locality, 24 July 1953, fl. (P, TEF); Service Forestier 14597, same locality, 1 Sep. 1955, fl. (P); Service Forestier 28656, vestiges forestiers, sur dunes anciennes, sur la route de Ste. Luce, [24° 47 ' S, 47° 11 ' E], 11 Dec. 1968, fr. (P, TEF); Zarucchi et al. 7504, Mandena STF, coastal low forest on sand, 24° 57 ' S, 47° 02 ' E, 10 m, 26 May 1991, bud (K, MO, P, TAN).