Rhodocolea humbertii, Callm. & Phillipson, 2011

Callmander, Martin W. & Phillipson, Peter B., 2011, Four new species in the endemic genus Rhodocolea Baill. (Bignoniaceae) from Madagascar, Adansonia (3) 33 (2), pp. 311-321 : 312-314

publication ID

https://doi.org/ 10.5252/a2011n2a14

persistent identifier

https://treatment.plazi.org/id/03AC878D-FFC4-6962-FCE3-3C847912F941

treatment provided by

Carolina

scientific name

Rhodocolea humbertii
status

 

Genus Rhodocolea Baill. View in CoL

1. Rhodocolea humbertii

Callm. & Phillipson, sp. nov. ( Fig. 1 View FIG )

Haec species a congeneris foliis compositis 25-33 cm longis petiolo incluso, inflorescentia cauliflora sat parva atque calyce grandi denticulato facile distinguitur.

TYPUS. — Madagascar. Prov. d’Antsiranana, vallée de l’Andalangy, affluent de l’Andraronga (bassin de la Bemarivo du Nord-Est), 14°18’S, 49°43’E, 12-14.XI.1950, fl., Humbert & Capuron 24210 (holo-, P [ P00730612 ]!; iso-, B, K!, G [ G00303502 ]!, MO [ MO05033701 , 3640192 ]!, NY, PRE, TAN, WAG) GoogleMaps .

PARATYPI. — Madagascar. Prov. d’Antsiranana, vallée de l’Antsahabe, affluent de la Lokoho, 14°27’S, 49°50’E, 10-11.III.1950, fl., Humbert 23345 ( MO [ MO3600880 ], P [2 sheets]). — À l’ouest de la rivière Manantenina, pentes orientales du Massif de Marojejy, 100-300 m, 14°29’S, 49°49’E, 14-15.IV.1949, Humbert 23407 ( P) GoogleMaps . — Vallée inférieure de l’Androranga, affluent de la Bemarivo (nord-est) aux environs d’Antongondriha, Mont Anjenabe, 14°17’S, 49°46’E, 3.XI.1950, fl., Humbert & Capuron 24056 ( MO [ MO05033703 ], P) GoogleMaps . — Vallée de l’Andalangy , affluent de l’Androronga (bassin de la Bemarivo du Nord-Est), 14°18’S, 49°43’E, 12-14.XI.1950, fl., Humbert & Capuron 24213 ( MO [ MO3640193 ], P) GoogleMaps .

DESCRIPTION

Tree up to 10-15 m tall; dbh> 25 cm. Leaves imparipinnate, 25-33 × 10-12 cm (including petiole); rachis canaliculate, 0.2-0.3 cm in diam., dark green or straw-yellow when dried, glabrous; nodes slightly swollen, not conspicuous; petiole 5-7 cm long. Leaflets generally (7-)9-13; blade ovate, (5-)7(-9) × (2.5-)3(-3.5) cm, chartaceous, darker on the upper surface, glabrous; base shortly attenuate; apex acuminate, the acumen c. 10 × 4-6 mm; margins entire; midrib and secondary veins prominent on the both surfaces, reticulation visible; petiolule length 3-5 mm (lateral leaflets), up to 30 mm (terminal leaflets). Inflorescence, cauliflorous or terminal, a raceme up to c. 12 cm long, with 6-4 nodes each bearing 3-2 flowers; axis fine, patent, cylindric, c. 1 mm diameter, drying dark brown; bracts narrowly triangular, c. 3 × 1 mm, glabrous, persistent; peduncle <5 mm long; pedicel 2-3 cm long with a pair of minute persistent glabrous bracteoles at the base. Calyx campanulate, puberulent, 1.5-2 × 1.5- 1 cm, 5-lobed, with 5 prominent veins; lobes triangular, c. 4 × 4 mm, acute. Corolla tubular with 5 spreading lobes, c. 5.5 × 4 cm, pale pink [fide notes on Humbert 23345]; tube c. 3.5 × 1 cm, interior vinous, rather abruptly narrowed to c. 3 mm diameter in the basal 1/4; lobes rounded c. 1.5 × 1 cm; stamens 4, 2.2 cm long, filament densely pubescent at base, anthers c. 2 mm long, 2-locular; style 2.5 cm long, stigma laterally flattened, shortly bilobed. Fruit unknown.

DISTRIBUTION AND ECOLOGY

Rhodocolea humbertii is endemic to the mid-elevation evergreen humid forests around the Marojejy massif in northwestern Madagascar ( Fig. 2 View FIG ), but is not known from within the Marojejy National Park.

CONSERVATION STATUS

With an EOO of 83 km 2, an AOO of 27 km 2 and 5 subpopulations, none of which situated within the protected area network, Rhodocolea humbertii is assigned a preliminary status of Critically Endangered (CR B1ab[iii]).

REMARKS

Rhodocolea humbertii can be easily recognized by its long compound leaves (25-33 cm including petiole), rather small cauliflorous inflorescence (8-12 cm long) and by it large denticulate calyx (1.5-2 × 1-1.5 cm). Another new species described below, R. parvifoliolata growing the littoral forests of Masoala also bears similar large calices but the leaves and leaflets are much smaller in the latter (leaves: [6-]10-13 × 3-4.5 cm; leaflets: 2.5- 1.5 × 1- 0.6 cm in R. parvifoliolata vs. leaves: 25-33 × 10-12 cm; leaflets: [5-]7[-9] × [2.5-]3[3.5] cm in R. humbertii ).

P

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

B

Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet

K

Royal Botanic Gardens

G

Conservatoire et Jardin botaniques de la Ville de Genève

MO

Missouri Botanical Garden

NY

William and Lynda Steere Herbarium of the New York Botanical Garden

PRE

South African National Biodiversity Institute (SANBI)

TAN

Parc de Tsimbazaza

WAG

Wageningen University

À

Harvard University - Arnold Arboretum

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