Noronhia decaryana H. Perrier

Hong-Wa, Cynthia, 2016, A taxonomic revision of the genus Noronhia Stadtm. ex Thouars (Oleaceae) in Madagascar and the Comoro Islands, Boissiera 70, pp. 1-292 : 91-92

22. Noronhia decaryana H. Perrier in Mém. Inst. Sci. Madagascar, Sér. B, Biol. Vég. 2: 287. 1949.

Typus: MADAGASCAR. Prov. Toamasina: Est: S de Moramanga , [18°56’S 48°13’E], 900 m, 15.II.1930, Decary 7126 (holo-: P [ P00413222 ]!; iso-: P [ P00413223 , P00413224 ]!).

Description

Trees to 12 m tall, trunk to 15 cm diameter; young twigs cylindrical, 0.7-2.6 mm diameter, glabrous; bark dark to medium gray, smooth to slightly rugose. Leaves opposite, persistent; bud scales persistent; blades dark green above, lighter below, oblong to elliptic, 5-17.5 3 2-7.5 cm, chartaceous, glabrous, domatia rare, base rounded to acute, margin slightly revolute and undulate, apex cuspidate, the cusp 4-21 mm long, midrib sunken above, raised below, secondary veins con-spicuous, 6-14 per side, 7-30 mm apart, looping 2-7 mm from the margin; pet-iole medium to light gray, 3-11 3 0.7-2.7 mm, entirely woody, glabrous. Thyrses fasciculate, pauciflorous, diffuse; peduncle 6-18 mm long, glabrescent; pedicel 6-28 mm long, glabrescent; calyx moderately pubescent outside, glabrous inside, lobes triangular, 1-2.8 x 1-2 mm; corolla orangish-red outside, yellowish inside, urceolate, 4-8 mm long, glabrous on both sides, the tube 1-5 mm long, lobes ovate to triangular, apex acute; corona absent; stamens 1.3-2.8 mm long, anthers oblate to orbicular, 1-1.9 mm long; pistil 2-3.5 mm long, stigma capitate. Fruiting pedicel 4-29 3 0.5-2.2 mm; young fruits green, dark red when mature, ovoid to subglobose, 12.5-20.5 3 8.5-21 mm, surface smooth, sometimes covered with white dots, apex flat, style persistent; dry pericarp 0.4-1.7 mm thick; endocarp crustaceous; seed 6.5-13 3 5-15 mm.

Distribution, ecology and phenology

Noronhia decaryana occurs in low- to high-elevation humid forests, from Tsarata-nana in the north to Ivohibe and Manombo in the south ( Fig. 9 ). It produces flow-ers and fruits throughout the year.

Conservation status

Based on 21 collections representing 19 localities, the assessment resulted in an EOO of 89,050 km 2, an AOO of 76 km 2, and 19 subpopulations representing 14 locations, of which 10 occur within protected areas (Analamazaotra, Anjana-haribe-Sud, Corridor Ambositra-Vondrozo, Corridor Ankeniheny-Zahamena, Manombo, Mantadia, Ranomafana, Tsaratanana, Tsaratanana-Ambohimiraha-vavy-Corridor Marojejy, and Zahamena). Although some locations are not encom-passed within protected areas and are subject to habitat degradation, N. decaryana is widespread, with an actual AOO likely much larger than 2,000 km 2, and is therefore assigned a preliminary status of “Least Concern”.

92 Boissiera 70

Notes

Noronhia decaryana can be recognized by its chartaceous, cuspidate leaf blades, long-pedunculate inflorescences with orangish-red flowers that lack a corona, and crustaceous fruits. It differs from N. cuspidata by the features discussed under that species and from N. gracilipes H. Perrier mainly by rarely (vs. frequently) having domatia on the abaxial leaf blades, and by its urceolate (vs. cupuliform to subro-tate), orangish-red (vs. pinkish) flowers.

Additional specimens examined

MADAGASCAR. Prov. Antsiranana: Beramanja, Anketrabe Belinta , forêt de Manon-garivo-Kalobinono , 13°38’18”S 48°40’29”E, 520 m, 27.IX.2013, Manjato et al. 411 ( DOV, G, MO, P, TAN) ; Tsaratanana RNI, Beangona , 14°02’50”S 48°47’09”E, 1100 m, 27.XI.2000, Razakamalala et al. 3 ( MO, P, TAN) . Prov. Fianarantsoa: Manombo RS, 23°00’S 47°42’E, 5.III.2009, Hong-Wa et al. 612 ( MO, P, TAN) ; Ranomafana PN, Vatoharanana, Parcelle 3, 21°16’06”S 47°25’30”E, 923 m, 8. V.2010, Hong-Wa & Ortiz 671 ( MO, P, TAN) . Prov. Toamasina: Moramanga, Ambatovy , Analamay , 18°48’24”S 48°18’31”E, 1119 m, 22.X.2005, Antilahimena et al. 4106 ( MO, P, TAN) ; Toamasina, [17°45’S 48°33’E], 1200 m, 29.XII.1944, Cours 2136 ( G, MO, P) ; Analamazaotra RS, 18°56’12”S 48°25’09”E, 953 m, 2. V.2010, Hong-Wa & Ortiz 648 ( MO, P, TAN) ; Ambatondrazaka , 18°52’S 48°30’E, 985 m, 6-7.III.1992, Noyes et al. 989 ( MO, P) ; Ampitambe, forêt d’Analamay , 18°51’22”S 48°19’34”E, 1080 m, 29. VI.1997, Rakotomalaza et al. 1363 ( MO, TAN) ; Manakambahiny Est, Zahamena RNI, 17°40’34”S 48°45’32”E, 1351 m, 14.IX.2002, Randrianjanaka et al. 725 ( CNARP, MO, P, TEF) ; Brickaville, Maroseranana, Ambodilendemy , 18°25’35”S 48°47’17”E, 1019 m, 21.III.2011, Ravelonarivo & Edmond 3767 ( MO, P, TAN) ; Fénérive-Est, Mandifikantsy, Sahatavy , [17°36’42”S 48°54’00”E], 19. I.1956, Réserves Naturelles 7832 ( MO, P).

Figures

Fig. 9. Distribution maps of species of Noronhia Stadtm.ex Thouars. N. christenseniana Dubard to N. domatifera Bosser.