Uapaca densifolia Baker

Mcpherson, Gordon, 2011, A review of Madagascan Uapaca (Euphorbiaceae s. l.), Adansonia (3) 33 (2), pp. 221-231 : 225-226

publication ID 10.5252/a2011n2a7

persistent identifier

treatment provided by


scientific name

Uapaca densifolia Baker


4. Uapaca densifolia Baker View in CoL

Journal of the Linnean Society, Botany 20: 252 (1883).

Uapaca myricaefolia Baker , Journal of the Linnean Society, Botany 21: 440 (1884). — Type: Madagascar. Central Madagascar, s.d., fr., Baron 2209 (lecto-, K [sheet K000406450 ], here designated)

Uapaca perrieri Denis, Archives de Botanique View in CoL , Bulletin mensuel, Caen 1: 228 (1927). — Type: Madagascar, Domaine du Centre , Anosimbohampy au nord d’Andilamena, bois à 900 m alt., XI.1922, fr., Perrier de la Bâthie s.n. (holo-, P [sheet P00298678 ]).

Uapaca angustifolia Denis, Archives de Botanique View in CoL , Bulletin mensuel, Caen 1: 227 (1927). — Type: Madagascar, Domaine de l’Est, Forêt d’Analamazoatra, 800 m alt., s.d., fl. ♂, Perrier de la Bâthie 9618 (lecto-, P [sheet P00298668 ], here designated).

Uapaca densifolia var. humbertii Leandri, Mémoires de l’Institut View in CoL scientifique de Madagascar, Série B, Biologie végétale 8: 257 (1957). — Type: Madagascar, Prov. Antsirana, Vallée de la Lokoho (Nord-Est), Mont Beondroka au nord de Maroambihy, sylve à lichens sur gneiss et quartzite, 1000-1450 m alt., 17-22.III.1949, fl. ♂, Humbert View in CoL 23499 (lecto-, P [sheet P00539632 ], here designated).

Uapaca sambiranensis Denis, Archives de Botanique View in CoL , Bulletin mensuel, Caen 1: 226 (1927). — Type: Madagascar, Basses montagnes du Haut Sambirano, 500 m alt, XII.1922, fr., Perrier de la Bâthie 15207 (holo-, P [sheet P00132880 ]; iso-, MO [sheet 04954787]).

TYPUS. — Madagascar. Central Madagascar , s.d., fl. ♂ ,

Baron 1917 (holo-, K [sheet K000406451]).


car. Prov. Antsiranana, Daraina, forêt d’Antsahabe,

13°13’S, 049°33’E, 1005 m, 19.I.2004, Nusbaumer

1045 (G, MO, P). — Eod. loc., 910 m, 23.XI.2004,

Gautier 4737 (G, MO, P). — Marojejy RN, Mt. An-

jenabe, 14°17’S, 049°46’E, 1100 m, 3-7.XI.1950, Hum-

bert 24126 (MO, P). — Eod. loc., Andranomilolo,

14°19’02”S, 049°19’04”E, 1222 m, 19.XI.2006, Ra-

zakamalala 2988 (MO, P, TAN). — Eod. loc., Mt.

Beondroka, 14°27’S, 049°47’E, 830-1210 m, 26.X.1989,

Miller 4440 (MO, P). — Prov. Toamasina, Ankirin-

dro, 15°17’18”S, 049°32’49”E, 671 m, 22.XI.2002,

Antilahimena 1452 (MO, P). — Zahamena, 17°41’S,

048°49’E, 800-900 m, 24.VII.2003, Rakotonandrasana

710, 711 (MO, P). — Mantadia PN, 18°55’S, 048°25’E,

950-1150 m, 7.XI.1994, McPherson 16528 ( MO, P,

TAN). — Eod. loc., 900 m, 10.XI.1994, McPherson

16577 (MO, P, TAN). — Route de Lakato , 19°11’00”S ,

048°26’00”E, XII.1972, Morat 3974 ( MO, P). — Prov. Antananarivo, 7 km E of Anjozorobe , 18°22’S, 048°00’E, 1300 m, 11.V.1987, Schatz 1385 ( MO, P) GoogleMaps .


Tree (2-) 5-15 m tall; stilt roots often reported as present; leaf-bearing twigs 3-5 mm in diameter, solid. Leaf blades obovate, (1.6-)3.7-11(-16) cm long, (0.7-)1.2-5(-8.7) cm wide, base cuneate, apex obtuse, secondary veins 6-9 on each side of the midrib, usually not impressed adaxially, higher venation usually not visible, not scalariform when visible;surfaces typically not glossy, drying somewhat reddish brown typically; margin often recurved; petiole (0.1-)0.8-2.0 cm long.

Staminate peduncle 8-15 mm long; flowering heads 3-4(-5) mm in diameter excluding the exserted stamens; staminodes present; pistillode somewhat pubescent on distal surface. Pistillate peduncle 0.8-2.0(-3.8) cm long; calyx 3 mm in diameter in flower, often conspicuously lobed, ciliate or sparsely pubescent on and near distal margin, often glabrate; ovary glabrous; calyx in fruit 1 mm high, 4-4.5(-5.5) mm in diameter, sparsely ciliate or glabrescent; fruit red at maturity, 12-15(-18) mm long, 12-14(-16) mm in diameter, usually pointed, glabrous.


Found in the forests of the east and north as well as those of the central plateau, at elevations up to 1675 m but rarely below 500 m.


This much-collected species can often be recognized by its small leaves and small fruits. Larger-leaved specimens can be identified by their non-scalariform venation, small, glabrous to sparsely pubescent pistillate calyx, and small fruit. Leaf variation is dismayingly strong in this species. Leaves from midelevation trees growing in humid forest are typically 6-11 × 3-5 cm, but leaves from plants apparently growing under similar conditions can be markedly smaller. Intermediates unfortunately connect the various extremes, and I have been unable to split the many specimens into coherent groups based on more than one character. I therefore am forced to recognize a widely delimited U. densifolia , much as did Leandri in 1958. The species most easily confused with U. densifolia is probably U. louvelii ; specimens of the latter that lack mature fruits can be separated by their scalariform venation and the fact that all parts tend to be covered in a glossy exudate. Uapaca bojeri , also mistakable for U. densifolia , can be separated by its more uniformly pubescent pistillate calyx and its glabrous pistillode, as well as by its ecology.


Royal Botanic Gardens


Missouri Botanical Garden


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


Royal Botanic Garden Edinburgh














Uapaca densifolia Baker

Mcpherson, Gordon 2011

Uapaca myricaefolia

Baker 1884: 440
Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF