Melanoxerus antsirananensis Kainul.

Kainulainen, Kent, 2021, A taxonomic revision of Melanoxerus (Rubiaceae), with descriptions of three new species of trees from Madagascar, Candollea 76 (1), pp. 105-116: 107-108

publication ID

http://doi.org/ 10.15553/c2021v761a11

DOI

http://doi.org/10.5281/zenodo.5711512

persistent identifier

http://treatment.plazi.org/id/F35B0449-FF9F-3A67-FF35-F9928185FD63

treatment provided by

Carolina

scientific name

Melanoxerus antsirananensis Kainul.
status

sp. nov.

1. Melanoxerus antsirananensis Kainul.   , sp. nov. ( Fig. 2 View Fig ).

Euclinia sp. 1   in KAINULAINEN & BREMER (2014: 820).

Holotypus: MADAGASCAR. Reg. DIANA [Prov. Antsiranana]: Distr. Ambilobe, Mahamasina, Réserve Spéciale d’Ankarana , 12°57 '15"S 49°07 '39"E, 100 m, 10.II.2003, fr., Bardot-Vaucoulon et al. 1406 ( P [ P00455719]!; iso-: K [ K000551041]!, MO!, TAN). GoogleMaps  

Melanoxe r us antsirananensis   K ainul. diff e rs f r om M. suavissimus (Homolle ex Cavaco) Kainul. & B. Bremer   by its pauciflorous inflorescences (vs. solitary flowers), campanulate (vs. funnelform) corollas, and obovate (vs. ovate to lanceolate) leaves. It most resembles M. atropurpureus Kainul.   , from which it differs in that the corolla throat is white with purple and sometimes green spots (vs. uniformly purple), and in its smaller (7–18 × 4.5–8.5 cm vs. 10– 30 × 6.5–14.5 cm) and obovate (vs. broadly lanceolate) leaves.

Shrubs or trees up to 18 m tall and 40 cm dbh. Bark beige or whitish pale grey and smooth. Stipules 9–14.5 × 4–7 mm, triangular, interpetiolar, caducous. Leaves deciduous, petioles 0.7–6 cm long, adaxially canaliculate; leaf blades papyraceous, obovate, 7–18 × 4.5–8.5 cm; bases cuneate to attenuate, apices (rounded) obtuse to apiculate or shortly acuminate; adaxial surface: dark green when fresh, drying dark brown to black, smooth and glossy, glabrous; 8 – 12 pairs of conspicuous, ± pinnate secondary veins, tertiary venation reticulate; midribs prominent, whitish green when fresh, ± the same colour as the leaf when dry; abaxial surface green when fresh, drying dark brown to blackish, glabrous except for tuft domatia that are often present in the vein axils. Flowers solitary or few (<10) in a terminal, sessile, congested and umbel-like inflorescence; pedicels up to 30 mm long; hypanthium narrowly urceolate, 5–8 × 3–4 mm, glabrous. Calyces green; calyx tubes 0.5–2 mm long, externally and internally glabrous; calyx lobes 4.3–11 × 0.8–3.5 mm, narrowly triangular, spreading or recurved. Corollas fleshy, campanulate; corolla tubes 1.5–2.6 cm long, externally (yellowish) white, sometimes with purple and pale green streaks, glabrous, internally white with red, purple or violet (and sometimes also pale green) spots, glabrous or with a few trichomes (0.1 –0.5 mm long) at the very base; corolla lobes white (sometimes with purple spots on the external side), 1–4.5 × 0.8–2.5 cm, ovate to deltate, rounded to acute, spreading horizontally at anthesis; stamens subsessile (filaments c. 2 mm long), attached 10–12 mm below corolla sinus and 3 mm from anther base; anthers 11–18 × 1.5–2 mm, linear, included or shortly exserted (to 2 mm above corolla sinus). Styles simple, clavate, with shallow longitudinal grooves, 14–20 mm long, glabrous, included or shortly exserted; stigma shortly bifid (lobes 0.5–3.5 mm long). Fruits (globose) ellipsoid, 3–7.6 × 2.7–6 cm, smooth, glabrous, olive to brown, with numerous beige to pale grey lenticels (1 – 2 mm in diam.), fleshy-indehiscent with yellowish to white pulp; calyx tube sometimes persistent but calyx lobes caducous. Seeds flattened, irregularly angled, 10–15 mm in diam., c. 2 mm thick, smooth, ± translucent, yellowish brown when fresh, drying black.

Vernacular names. – “Mamoampoma” (Rakotondrafara et al. 505); “Mantalana” (Service Forestier 8329); “Voavandrikala” (Manjakahery & Sola 83).

Distribution, habitat and ecolog y. – Melanoxerus antsirananensis   is only known from the DIANA and SAVA Regions in Antsiranana Province where it is widely distributed ( Fig. 1 View Fig ). The new species grows in littoral forests and in dry deciduous forests from sea level to c. 700 m in elevation on Montagne d’Ambre.

Phenology. – Flowering material has been collected from September to December and fruiting material from September to July.

Conservation status. – Melanoxerus antsirananensis   is known from numerous localities in northern Madagascar. Its distribution includes five protected areas, i.e. Ankarana, Loky-Manambato, Montagne d’Ambre, and Montagne des Français. Melanoxerus antsirananensis   is therefore assigned a preliminary conservation status of “Least Concern” [LC] according the IUCN Red list Categories and Criteria ( IUCN, 2012).

Notes. – The specimen Razafitsalama & Ludovic 16 is unusual in having distinctly velutinous leaves and is tentatively included here. The label on Meyers & Boltz 110 reports that the lemur Propithecus tattersalli   eats the young leaves of this species. Melanoxerus antsirananensis   flowers at the same time or just before the new leaves flush. It resembles M. atropurpureus   in having pauciflorous inflorescences and flowers with campanulate corollas. However, the phylogenetic analysis of KAINULAINEN & BREMER (2014) indicates that they are not sister species, a result that suggests that these shared characters may be plesiomorphic rather than synapomorphic.

Melanoxerus antsirananensis   is distinguished from M. atropurpureus   in its smaller leaves (7 –18 × 4.5–8.5 cm vs. 10– 30 × 6.5– 14.5 cm) that are obovate rather than broadly lanceolate. Furthermore, the corolla throat is white with red to violet spots (vs. uniformly dark purple in M. atropurpureus   ).

Selected additional material examined. – MADAGASCAR. Reg. DIANA [Prov. Antsiranana]: Masorolava, Mahagaga, Antsoroby forest , 12°42'37"S 48°58'11"E, 53 m, 27.IX.2007, fr., Andriamihajarivo et al. 1434 ( MO, P) GoogleMaps   ; Ankarana SR , 2 km W of Mahamasina village, 12°57'26"S 49°07'46"E, 132 m, 21–30.III.1995, fr., Andrianantoanina & Bezara 792 ( BR, G, K, MO) GoogleMaps   ; Montagne d’Ambre NP, c. 8 km E of Bobakilandy village, 12°37'37"S 49°06'26"E, 533 m, 5.XII.1995, fl., Andrianantoanina & Bezara 895 ( BR, G, K, MO) GoogleMaps   ; Andrafiamena , forest near Anjahankely, 12°54'23"S 49°19'30"E, 450 m, 6.I.2011, fr., Burivalova ZB 176 ( G, K) GoogleMaps   ; Ankarana , 12°50'47"S 49°06'18"E, 82 m, 14.I.2002, fr., De Block et al. 1226 ( BR, MO, P, TAN, UPS, WAG) GoogleMaps   ; Ankarana , 4–9.III.1951, fr., Humbert   & Capuron 25493 ( BR, K)   ; ibid. loco, 12°54'42"S 49°06'43"E, 240–260 m, 22.V.1993, fr., Jongkind & Rapanarivo 979 ( K, MO) GoogleMaps   ; Montagne des Français , 12°19'25.5"S 49°20'11"E, 230–250 m, 5.III.2016, ster., Kainulainen et al. 370 ( TAN) GoogleMaps   ; Anosy à 4 km au NE du village d’Ambolobozokely [Nosy Voanio], 12°26'49"S 49°33'07"E, 22 m, 30.III.2007, fr., Rakotondrafara et al. 505 ( BR, MO, P) GoogleMaps   ; Andranovondronina, Andakorobe, village le plus proche Antsaravy , 12°08'51"S 49°20'30"E, 19 m, 17.III.2006, fr., Rakotondrafara et al. 474 ( CNARP, K, MO, P, TAN) GoogleMaps   ; Montagne d’Ambre , 12°34'59"S 49°05'59"E, 683 m, 5.II.2012, fr., Ramandimbimanana & Randimbiarison SDR 372 ( BR, G, MO) GoogleMaps   ; Sahafary SF , 12°35'51"S 49°26'31"E, 250 m, 7.XI.2006, fl., Ranaivojaona et al. 1551 ( BR, MO, K, P, TAN) GoogleMaps   ; Nosy Voanio , 4 km E of Ambolobozokely, 12°26'01"S 49°33'00"E, 15 m, 15.II.2006, fr., Randrianaivo et al. 1364 ( BR, MO) GoogleMaps   ; Mosorolava, Ampombiantambo, Antsoroby forest , 12°42'13"S 48°58'12"E, 75 m, 23.IX.2007, fl. & fr., Ratovoson et al. 1332 ( CNARP, G, MO, P, TAN) GoogleMaps   ; Ankarana , 11–14.I.2002, fr., Razafimandimbison & Andrianatoanina 454 ( BR, MO, UPS)   ; Ankarongana, Irodo , N of Analamerana forest, Ampandriantsira , 12°39'42"S 49°32'37"E, 50–123 m, 14.II.2001, fr., Razafitsalama & Ludovic 16 ( MO, P) GoogleMaps   ; Montagne des Français , 250 m, 18.II.1954, fr., Service Forestier 8329 ( P, TEF)   ; Ankarefo , 18.V.1954, fr., Service Forestier 10003 ( P)   ; Diego-Suarez, Bemaskabe forest , 200–500 m, 17.X.1927, fr., Ursch 231 ( P)   . Reg. SAVA [Prov. Antsiranana]: Distr. Vohemar, Daraina, Bekaraoka south , 13°11'S 49°42'E, 9.IV.2008, fr., Bremer et al. 5113 ( MO, S, TAN) GoogleMaps   ; Hillside next to Daraina, 13°08'S 49°27'E, 10.IV.2008, fr., Bremer et al. 5131 ( MO, S, TAN) GoogleMaps   ; Daraina, Bobankora forest , 13°12.72'S 49°46.27'E, 200 m, 2.II.2003, fr., Gautier et al. LG 4195 ( G, K, MO) GoogleMaps   ; Daraina, Bekaraoka forest , 13°03.90'S 49°42.35'E, 420 m, 22.XI.2006, fl., Gautier et al. LG 4911 ( G) GoogleMaps   ; Nosibe, Anjiabe, Anaborano , 13°04'18"S 49°54'32"E, 33 m, 11.XII.2004, fr., Manjakahery & Sola 83 ( MO) GoogleMaps   ; Mantamena , 7 km NW of Daraina, 13°08'S 49°42'E, 112–330 m, IV.1990, Meyers & Boltz 110 ( MO) GoogleMaps   ; Nosibe, Anjiabe, Analabe forest , 13°04'43"S 49°54'04"E, 11.V.2004, fr., Rabehevitra et al. 915 ( MO, P) GoogleMaps   ; Tsarabaria, Manakana, Ambondrombe forest , 13°42'58"S 50°05'37"E, 3 m, 24.X.2002, fr., Rabenantoandro et al. 1019 ( MO) GoogleMaps   ; Nosibe , Anjiabe , Anaborano forest, near lake Sahaka, 13°04'42"S 49°54'13"E, 25 m, 2.XI.2002, fl., Rabenantoandro et al. 1091 ( MO, TEF) GoogleMaps   ; ibid. loco, 13°04'43"S 49°54'04"E, 10 m, 23.II.2003, fr., Rabenantoandro et al. 1272 ( MO, TEF) GoogleMaps   ; Mosorolava forest , 13°05'44"S 49°54'43"E, 23 m, 5.X.2013, fl., Rakotovao 6482 ( MO) GoogleMaps   ; Fanambana , Ambohimahazo forest, 13°35'44"S 50°00'04"E, 60–100 m, 30.III.2001, fr., Ranaivojaona et al. 355 ( BR, MO, P) GoogleMaps   ; Solanampilana forest 35 km N of Daraina, 13°05'42"S 49°34'57"E, 137 m, 9.XII.2006, fl. & fr., Randrianaivo et al. 1433 ( G, MO, P, TAN) GoogleMaps   ; Daraina , Ambilondomba forest, 13°09'39"S 49°38'47"E, 390 m, 31.I.2004, fr., Ranirison et al. PR 367 ( G) GoogleMaps   ; Vohimarina , Fanambana, Antsatoby, 13°36'55"S 49°59'55"E, 77 m, 8.VII.2007, fr., Rasoafaranaivo 239 ( MO) GoogleMaps   ; Analabe forest , near Anaborano village and Sahaka lake, 13°04'59"S 49°54'26"E, 10.VII.2003, fr., Razakamalala 519 ( MO, P, TEF) GoogleMaps   ; Tsarabaria , Manakana , E of Ambondrobe village, 13°43'08"S 50°05'50"E, 13.III.2004, fr., Razakamalala RZK 1022 ( K, MO, P, TEF) GoogleMaps   .

UPS

UPS

WAG

WAG

CNARP

CNARP

TEF

TEF

P

Museum National d' Histoire Naturelle, Paris (MNHN) - Vascular Plants

K

Royal Botanic Gardens

MO

Missouri Botanical Garden

TAN

Parc de Tsimbazaza

BR

Embrapa Agrobiology Diazothrophic Microbial Culture Collection

G

Conservatoire et Jardin botaniques de la Ville de Genève

UPS

Uppsala University, Museum of Evolution, Botany Section (Fytoteket)

WAG

Wageningen University

TEF

Centre National de la Recherche Appliquée au Developement Rural

S

Department of Botany, Swedish Museum of Natural History

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Gentianales

Family

Rubiaceae

Genus

Melanoxerus

Loc

Melanoxerus antsirananensis Kainul.

Kainulainen, Kent 2021
2021
Loc

Euclinia sp. 1

KAINULAINEN, K. & B. BREMER 2014: 820
2014