A taxonomic revision of the genus Noronhia Stadtm. ex Thouars (Oleaceae) in Madagascar and the Comoro Islands
Hong-Wa, Cynthia
Boissiera
2016
2016-10-21
70
1
292
8WYRT
Hong-Wa
2016
[503,750,380,408]
Magnoliopsida
Oleaceae
Noronhia
Plantae
Lamiales
230
230
Tracheophyta
species
richardii
Typus: MADAGASCAR. Prov. Toliara: Anosy, Fort-Dauphin, Iaboko, Antsotso, forêt Ivohibe, 24°34’26”S 47°11’42”E, 261 m, XII.2005, Razakamalala et al. 2666(holo-: MO-6615556!; iso-: G[ G00341619]!, P[ P06490472] image seen, TAN).
Diagnosis Noronhia richardiiHong-Wa can be distinguished from other congeneric species by its lanceolate leaves, and its long and diffuse inflorescences with red flowers.
Description Small treesto 7 mtall; young twigs cylindrical, 0.7-1.4 mmdiameter, glabrous; bark medium gray, smooth. Leavesopposite, persistent; bud scales rarely persistent; blades medium green above, yellowish below, lanceolate to oblong, 9-11 3 2-4 cm, chartaceous, glabrous, domatia absent, base acute to rounded, margin slightly revolute, apex acuminate, the acumen 5-9 mmlong, midrib flat above, slightly raised below, secondary veins conspicuous, 9-12 per side, 9-17 mmapart, looping 1.3-3 mmfrom the margin; petiole medium gray, 6-11 3 1-2.5 mm, entirely woody, glabrous. Thyrsesgeminate, pauciflorous, diffuse; peduncle 4-30 mmlong, glabrous; pedicel 11-25 mmlong, glabrous; calyx sparsely pubescent to glabrescent outside, glabrous inside, lobes ovate, 1-2.5 3 1-2 mm; corolla red, cupuliform, 3-7 mmlong, glabrous on both sides, the tube 1-5 mmlong lobes widely ovate, apex acute; corona absent; stamens 2-3 mmlong, anthers widely oblong to almost square, 1.6- 1.9 mmlong; pistil 2.2-3.5 mmlong, stigma capitate. Fruitsunseen.
Etymology This name honors Richard Razakamalala, a botanist at the Missouri Botanical Garden in Madagascarand one of the most knowledgeable Malagasyfield botanists, for collecting the typespecimen and for providing invaluable preliminary identification on countless field collections.
Distribution, ecology and phenology Noronhia richardiioccurs in low-elevation humid forests on basement rocks at Bemangidy-Ivohibe north of Ste Luce in the south ( Fig. 49). It has been collected in flowers in November and December.
Conservation status Only three collections, representing three localities, were available and were all obtained from a single location within the recently established protected area of Tsitongambarika. The subpopulation occurs on the northeastern edge of the protected area, where significant human activities still put some pressure on the forest, resulting in continuing decline in habitat quality. Thus, with an AOO of just 8 km 2, a single location, and lingering threats that could rapidly affect the area, N. richardiiis assigned a preliminary status of “Vulnerable” [VU D2].
Notes Noronhia richardiiclosely resembles N. capuronii, from which it differs by its glabrous (vs. pubescent) petioles, lanceolate to oblong (vs. ovate) leaf blades with an acute to rounded (vs. cordate) base, long peduncles and pedicels (up to 30 mmvs. 8 mm), and red (vs. greenish) flowers. It can be recognized by its lanceolate leaves and long, diffuse inflorescences with red flowers.
Paratypi MADAGASCAR. Prov. Toliara: Fort-Dauphin, Iaboko, Antsotso, forêt d’Ivohibe, 24°34’14”S 47°12’04”E, 265 m, 28.XI.2005, Razakamalala et al.2424( G, MO, P, TAN); ibid. loc., 24°34’16”S 47°12’06”E, 271 m, 8.XII.2007, Razakamalala et al.3777( MO, P, TAN).
4023241386
2005-12
G, P, TAN
Madagascar
Typus
261
-24.57389
Fort-Dauphin
21
47.195
Anosy
230
230
G00341619, P06490472
1
Toliara
4023240393
2005-11-28
2007-12-08
2005-11-28
G, MO, P, TAN
Razakamalala et al.
Madagascar
Fort-Dauphin
265
-24.571112
Antsotso
21
47.201668
Iaboko
232
232
1
Prov. Toliara
4023240472
2007-12-08
2007-12-08
2005-11-28
MO, P, TAN
Razakamalala et al.
Madagascar
Fort-Dauphin
271
-24.571112
Antsotso
21
47.201668
Iaboko
232
232
1
Toliara