Uvariopsis Engl., Notizbl. Koenigl. Bot. Gart. Berlin 2: 298 1899
Creators: name: Couvreur, Thomas L. P.
name: Dagallier, Leo-Paul M. J.
name: Crozier, Francoise
name: Ghogue, Jean-Paul
name: Hoekstra, Paul H.
name: Kamdem, Narcisse G.
name: Johnson, David M.
name: Murray, Nancy A.
name: Sonke, Bonaventure
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Magnoliales
Annonaceae
Uvariopsis

description: Uvariopsis Engl., Notizbl. Königl. Bot. Gart. Berlin 2: 298, 1899 = Tetrastemma Diels Bot. Jahrb. Syst. 38(3): 241 1906; Thonnera De Wild., Ann. Mus. Congo Belge, Bot. sér. 5, 3[1]: 86, 1909 Type species. <i>Uvariopsis zenkeri</i> Engl. Description. Trees, 3-25 m tall, d.b.h. up to 40 cm; stilt roots or buttresses absent. Indumentum of simple hairs or glabrous. Leaves: petiole 2-8 mm long, 1-6 mm in diameter; blade 10-52 cm long, 3.5-14 cm wide, ovate, elliptic, obovate or oblong, apex acuminate to abruptly acuminate, acumen 0.7-2 cm long, base cuneate to cordate; midrib sunken or flat; secondary veins 6 to 20 pairs; tertiary venation reticulate. Flowers unisexual, monoecious, male and female flowers similar or dissimilar, or bisexual (in one species not present in Cameroon), with (5) 6 perianth parts in 2 whorls. Inflorescences ramiflorous or cauliflorous, flower buds globose or conical, 1 to 6(50) per inflorescence; pedicel 1-450 mm long; in fruit 3-450 mm long; bracts 1 to 4, one basal and one upper, or all basal, 1-2 mm long; sepals 2, valvate (imbricate), free or basally fused, 1.5-10 mm long, ovate to semi-circular, apex acute, acuminate or attenuate, base truncate; petals free or basally fused, (3)4, valvate, 2-45 mm long, 2.5-17 mm wide, oblong, ovate, elliptic or linear, apex acuminate or attenuate, base truncate; stamens 100 to 1000, in 9 to 30 rows, 1-2 mm long, oblong to elongated; connective reduced or absent, glabrous; staminodes absent; carpels free, 15 to 280, 1-4 mm long, stigma ovoid, coiled or flat, glabrous. Monocarps sessile or stipitate, stipes 1-10 mm long; monocarps 2 to 25, 15-80 mm long, 9-55 mm in diameter, cylindrical, ellipsoid or globose, apex rounded or apiculate, smooth, verrucose or bumpy; seeds 4-25 mm long, 3-15 mm in diameter, ellipsoid; aril absent. Taxonomy. Le Thomas (1969b); Gereau et Kenfack (2000); Kenfack et al. (2003); Dagallier et al. (in prep.). A genus with 18 species, 13 of which occur in Cameroon, three being endemic, making Cameroon a center of diversity for this genus. <i>Uvariopsis</i> is distinguished from other Annonaceae genera in Cameroon by having 2 sepals and 4 petals in a single whorl (except for <i>U. congolana</i> which has 3 petals but 2 sepals). <i>Uvariopsis</i> is unisexual and monoecious (male and female flowers on same individual), except for the East African species <i>U. bisexualis</i> Verdc. which is bisexual (Verdcourt 1986). Important characters to distinguish the different species of <i>Uvariopsis</i> are the shape of the flower buds (which can be conical or globose) and whether the petals are basally fused or free (Gereau and Kenfack 2000; Kenfack et al. 20 03; Gosline et al. 2022). <i>Uvariopsis</i> can be divided in two main groups: species with male or hermaphrodite flowers occurring on branches, and then the flowers are small (petals shorter than 7 mm), and species with large flowers (petals longer than 7 mm) all cauliflorous. The species <i>Dennettia tripetala</i> Bak. f. was suggested to be congenic with <i>Uvariopsis</i> (Kenfack et al. 2003), but recent phylogenetic analyses showed it should be kept in a genus of its own which is followed here (Dagallier et al. in prep; see under that name).
description: Published as part of <i>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. &amp; Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207</i> on pages 404-405, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371", "Kenfack, D, Gosline, G, Gereau, RE, Schatz, GE, 2003. The genus Uvariopsis (Annonaceae) in tropical Africa with a recombination and one new species from Cameroon. Novon 13: 443 - 449, DOI: https://doi.org/10.2307/3393377", "Verdcourt, B, 1986. New taxa of East African Annonaceae. Kew Bulletin 41: 287 - 297, DOI: https://doi.org/10.2307/4102932", "Gereau, RE, Kenfack, D, 2000. The genus Uvariopsis (Annonaceae) in tropical Africa, with the description of a new species from Cameroon. Adansonia 22: 39 - 43", "Gosline, G, Cheek, M, Onana, JM, Tchatchouang, EN, Burgt, XM van der, MacKinnon, L, Dagallier, L-PMJ, 2022. Uvariopsis dicaprio (Annonaceae) a new tree species with notes on its pollination biology, and the Critically Endangered narrowly endemic plant species of the Ebo Forest, Cameroon. PeerJ 9: e12614. https://doi.org/10.7717/peerj.12614"]}