Greenwayodendron glabrum Lissambou, Hardy & Couvreur, PhytoKeys 114: 66, 2018

Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, PhytoKeys 207, pp. 1-532 : 111-113

Greenwayodendron glabrum Lissambou, Hardy & Couvreur, PhytoKeys 114: 66, 2018

Figs 27 , 29 ; Map 4C

Type.

Cameroon. South Region; 40 km from Kribi, 5 km. E. of Edea road, tract of Fifinda-Bella road (SFIA), Bos J.J. 6267, 6 Feb 1970: holotype WAG[WAG.1433854]; isotypes BR[BR0000014826399]; YA n.v.; WAG[WAG1433855] .

Description.

Tree, 7-30 m tall, d.b.h. 3-20 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 3-6 mm long, 1-2 mm in diameter, glabrous, grooved, blade inserted on the side of the petiole; blade 6.5-16.2 cm long, 2.1-5.8 cm wide, elliptic to oblong, apex acuminate to caudate, acumen 0.4-2 cm long, base cuneate to rounded, papyraceous, below sparsely pubescent to glabrous when young, glabrous when old, above glabrous when young and old, concolorous; midrib impressed, above completely glabrous when young and old, below glabrous when young and old; secondary veins 5 to 7 pairs, glabrous below; tertiary venation indistinct. Individuals androdioecious; male and bisexual inflorescences similar, ramiflorous on old leafless and young foliate branches, leaf opposed or extra axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 4 per inflorescence; pedicel ca. 4 mm long, ca. 1 mm in diameter, pubescent to glabrous; in fruit 6-13 mm long, 1-2 mm in diameter, pubescent to glabrous; bracts 2, one basal and one upper towards the upper half of pedicel, basal bracts 1-2 mm long, 2 mm wide; upper bracts 1-3 mm long, 1-3 mm wide; sepals 3, valvate, basally fused to free, 3 mm long, 3-4 mm wide, ovate, apex acuminate, base truncate, green, pubescent outside, glabrous inside, margins flat; petals free, sub equal; outer petals 3, 12-13 mm long, 2-2.5 mm wide, elliptic to ovate, apex acuminate, base rounded, green to light yellow, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, 12-13 mm long, 2-2.5 mm wide, ovate, apex acuminate, base rounded, green to light yellow, margins flat, pubescent outside, glabrous inside; stamens 10 to 15, in 4 to 5 rows, 1-2 mm long, elongated; connective tongue shaped, glabrous, green; staminodes absent; carpels free, 10 to 15, ovary ca. 1 mm long, stigma ovoid, pubescent. Monocarps stipitate, stipes 5-10 mm long, 1-3 mm in diameter; monocarps 2 to 8, 11-21 mm long, 11-21 mm in diameter, ellipsoid to globose, apex rounded, glabrous, smooth, smooth; seeds 1 to 4 per monocarp, 7-13 mm long, 7-13 mm in diameter, ellipsoid to flattened ellipsoid; aril absent.

Distribution.

Known from Cameroon and Gabon; in Cameroon known from the Littoral and South regions.

Habitat.

A common species when present and growing in sympatry with G. suaveolens in southern Cameroon; in lowland non-inundated primary or secondary forests. Altitude 20-750 m a.s.l.

Local and common names known in Cameroon.

None recorded, but possibly same as G. suaveolens (see below).

IUCN conservation status.

Least Concern (LC) ( Harvey-Brown 2019b).

Uses in Cameroon.

None recorded.

Notes.

This species is very close morphologically to G. suaveolens. Both species grow in sympatry in southern Cameroon. However, G. glabrum is distinguished by its glabrous petiole and upper midrib and leaf blades (versus pubescent in G. suaveolens ). Studies have shown that these two species are genetically distinct at both the phylogenetic ( Couvreur et al. 2019) and population genetic ( Lissambou et al. 2019) levels.

Specimens examined.

Central Region: Left bank Nyong R 30 km S of Edéa near bridge in road to Kribi , 3.8°N, 10.13°E, 26 April 1965, Leeuwenberg A.J.M. 5582 (B,BR,C,GC,K,LUAI,MO,P,UC,WAG,YA). Littoral Region : Ndogtima Nyong ( Edéa), 3.8°N, 10.13°E, 03 February 1974, Letouzey R. 12869 (BR,P,WAG,YA). South Region: 43 kmN of Kribi 5 km E of Edea road forest track Fifinda-Bella old secondary forest, 3.21°N, 10.06°E, 06 February 1970, Bos J.J. 6267 (BR,P,WAG,YA); ca 16 km On the road from Ebolowa to Minkok, 2.98°N, 11.17°E, 12 September 1975, de Wilde J.J.F.E 8465 (B,BR,K,MO,P,WAG,YA); Mvini 35 km East of Campo, 2.39°N, 10.04°E, 19 December 1983, Kaji M. 4 (YA); Campo-Ma’an region, 2.28°N, 9.950°E, 17 January 2016, Lissambou B.J. 1745 (BRLU); Campo-Ma’an region, 2.28°N, 9.949°E, 17 January 2016, Lissambou B.J. 1748 (BRLU); Campo-Ma’an region, 2.28°N, 9.948°E, 17 January 2016, Lissambou B.J. 1775 (BRLU); Campo-Ma’an region, 2.28°N, 9.949°E, 17 January 2016, Lissambou B.J. 1788 (BRLU); Campo-Ma’an region, 2.29°N, 9.945°E, 18 January 2016, Lissambou B.J. 1807 (BRLU); Campo-Ma’an region, 2.40°N, 9.895°E, 18 January 2016, Lissambou B.J. 1828 (BRLU); Campo-Ma’an region, 2.40°N, 9.894°E, 18 January 2016, Lissambou B.J. 1830 (BRLU); Campo-Ma’an region, 3.19°N, 10.10°E, 19 January 2016, Lissambou B.J. 1855 (BRLU); Campo-Ma’an region, 3.19°N, 10.10°E, 19 January 2016, Lissambou B.J. 1856 (BRLU); Cagnon du Ntem 16 km SW de Nyabessan, 2.32°N, 10.28°E, 30 November 1982, Nkongmeneck B.A. 400 (YA) .

Figures

Map 4. A Duguetia dilabens B Duguetia staudtii C Greenwayodendron glabrum D Greenwayodendron suaveolens E Hexalobus bussei F Hexalobus crispiflorus G Hexalobus monopetalus H Hexalobus salicifolius I Isolona campanulata. White borders represent region limits in Cameroon; green patches represent protected areas (see methods and Suppl. material 1: Fig. S 1).

Figure 27. Greenwayodendron glabrum A flowering branch B detail of lower leaf surface C detail of upper leaf surface D-G different types leaf apex H flower bud I infructescence J longitudinal section of fruit revealing seed K seed, latitudinal view L longitudinal section of seed showing ruminations A-C, G, H Letouzey 12869 D-F, I-L Bos 6267. Drawings by Hans de Vries (Lissambou et al. 2018, fig. 1, p. 63).

Figure 29. Greenwayodendron suaveolens A trunk, note light grey color B leaf, upper view C flower D flower, side view E detail of fruit, with longitudinal section of one monocarp showing 2 seeds. Greenwayodendron glabrum F branch with fruit G fruit with longitudinal section of monocarp showing seed A, E Couvreur 476, Lele, Cameroon B Couvreur 1196, Masea, Cameroon C, D Couvreur 560, Gabon F, G Bidault 847, Gabon. Photos A-E Thomas L. P. Couvreur F, G Ehoarn Bidault, Tropicos. org, Missouri Botanical Garden.