taxonID	type	description	language	source
A63287F7FFA9FFDCFD5BFE5EFB55F8E1.taxon	etymology	Etymology. The species is named after Dr Petra De Block, specialist of Rubiaceae and senior researcher in the Department of Phanerogamy of the National Botanical Garden of Belgium, for her contribution to the knowledge of the African Rubiaceae. Shrub or treelet 1 – 5 m tall, all vegetative and generative parts glabrous. Twigs pale green or brown or fawnish, with surface granular. Stipules caducous; basal portion 2 – 3 mm long; tip narrowly triangular, 2 – 7 mm long. Leaves petiolate; petioles canaliculate, 8 – 20 mm long; leaf blades narrowly obovate or more rarely, narrowly elliptic, 8.5 – 25 by 3.2 – 7.5 cm, subcoriaceous, pale green or pale greenish brown above, not discolorous or slightly paler below; base cuneate; apex acuminate, acumen 9 – 16 mm long; midrib prominent below; secondary and tertiary venation prominent on both surfaces, 14 – 16 pairs of secondary veins, tertiary and higher order venation ± regularly reticulate. Inflorescences supra-axillary, borne 1 – 3 mm above the nodes, paired and opposite, erect, subcapitate, very compact, 2.8 – 8 by 2 – 5.5 mm, with several to many flowers; peduncle flattened, 0.5 – 5 mm long; bracts broadly triangular, keeled, acuminate, 1 – 4 mm long; bracteoles broadly triangular, acuminate, c. 0.2 mm long. Flowers presumed heterostylous (but only longistylous morph known), 4 - merous, subsessile. Longistylous flowers: calyx creamy white; tube 0.8 – 1 mm long; lobes triangular, 0.2 – 0.4 mm long. Corolla white; tube narrowly cylindrical, 3.5 – 4 mm long, sparsely to densely pubescent at throat and upper quarter of the tube inside; lobes c. 3.5 mm long, finely pubescent in the lower half inside, apex acute. Stamens with anthers only 1 / 3 included in corolla tube, c. 1 mm long; filaments c. 0.4 mm long. Ovary 0.8 – 1 mm long. Style exserted for c. 3 mm, stigma bilobed, stigmatic lobes c. 1.5 mm long. Fruits pedicellate with pedicels 2.5 – 5 mm long, subglobose, asymmetrical, 5 – 7 mm diam, crowned with persistent calyx, purple or violet when ripe. Habitat & Ecology — Craterispermum deblockianum occurs in primary or old forest on sandy soil, often near a stream. Altitude 50 – 400 m. Flowers: December – January; mature fruits: April. Distribution — Craterispermum deblockianum is endemic to Gabon and is restricted to the ‘ Province du Moyen-Ougoué’. The species is mostly collected from the Njolé area. Conservation status — Endangered. See Table 1. Critical remarks — Flowers and fruits are rare on the specimens of C. deblockianum. Only longistylous flowers were seen and measurements were based on only two flowers. Taxonomic affinities — The affinities of Craterispermum deblockianum appear to lie with C. caudatum in sharing stipules with long narrowly triangular tips, long acuminate leaves, subcapitate inflorescences and long pedicellate fruits. However, C. deblockianum differs from C. caudatum in having the following main characters: the number of secondary veins (14 – 16 pairs in C. deblockianum vs 6 – 10 pairs in C. caudatum), the texture of the young branches (with surface granular in C. deblockianum vs smooth with decurrent ridges in C. caudatum), the size of leaf blades (8.5 – 25 by 3.2 – 7.5 cm in C. deblockianum vs 5 – 14.5 by 1.7 – 5.3 cm in C. caudatum) and the length of the peduncles (0.5 – 5 mm long in C. deblockianum vs 4 – 9 mm long in C. caudatum). Additional specimens examined. GABON, Breteler, Jongkind & Wieringa 11061 (WAG), 5 – 30 km NNW of Ndjolé, 23 Apr. 1992; De Wilde JJFE & Sosef 10288 (WAG), 9 km N of Ndjolé, exploitation track of Forest Exploitation of Gabon, 28 Jan. 1991; Dibata 58 (MO, WAG), Moyen Ogooué, ENE de Belle Vue, layon X, 22 Jan. 1987; Hallé N 1855 (P), 10 km S de Ndjolé, C. E. T. A. Ayem, 24 Apr. 1963; Wilks 1202 (WAG), Ngounié, vallée de la Waka, 28 km ENE du confluent Ngounié-Waka, 5 Feb. 1986.	en	Taedoumg, H., Hamon, P. (2013): Three new species of Craterispermum (Rubiaceae) from the Lower Guinea Domain. Blumea 57 (3): 236-242, DOI: 10.3767/000651913X663776, URL: https://doi.org/10.3767/000651913x663776
A63287F7FFAAFFDAFD5BF88BFC36FC07.taxon	etymology	Etymology. The species is named after the type locality. Shrub 1 – 2 m tall; all vegetative and generative parts glabrous; twigs pale brown, decurrently ridged. Stipules caducous, keeled; basal portion 4.5 – 6 mm long; tip narrowly triangular or needlelike, 1 – 1.5 mm long. Leaves petiolate; petioles canaliculate, 10 – 18 mm long; leaf blades obovate, 11.5 – 14.8 by 4.5 – 6.1 cm, subcoriaceous, yellowish brown above, paler below; base cuneate; apex acuminate, acumen 8 – 10 mm long; midrib prominent below; secondary venation prominent below and moderately prominent above, 8 – 9 pairs of secondary veins, tertiary and higher order venation conspicuous, closely and irregularly reticulate on both sides. Inflorescences sessile, axillary, paired, opposite, very compact cymes consisting of three subcapitate parts, the central part sessile and less developed and the lateral ones larger and borne on short axes <1 mm long, 9 – 16 by 3 – 10 mm, several-flowered; bracts and bracteoles very congested, triangular to ovate, c. 1.5 mm long, apex acute or obtuse. Flowers presumed heterostylous (but only longistylous morph known), 5 - merous, sessile. Longistylous flowers: calyx creamy white tinged violet; tube c. 0.6 mm long; lobes triangular, c. 0.3 mm long. Corolla white; tube narrowly cylindrical, 6.5 – 8 mm long, sparsely to moderately pubescent.) 2001 IUCN (criteria Category List Red IUCN the applying by assessed sonkeanum. C and rumpianum. C, deblockianum	en	Taedoumg, H., Hamon, P. (2013): Three new species of Craterispermum (Rubiaceae) from the Lower Guinea Domain. Blumea 57 (3): 236-242, DOI: 10.3767/000651913X663776, URL: https://doi.org/10.3767/000651913x663776
A63287F7FFAAFFDAFD5BF88BFC36FC07.taxon	description	Craterispermum of status Conservation 1 Table at throat and in upper half of corolla tube inside: lobes c. 6 mm long, finely pubescent in the basal half, apex acute and thickened with a subapical spike-like protuberance. Stamens with anthers only half exserted from corolla tube, inserted below the level of the throat, c. 2.5 mm long, white; filaments c. 0.2 mm long. Ovary c. 2 mm long. Style exserted for c. 5 mm; stigma bilobed, stigmatic lobes c. 2.5 mm long. Young fruits dark purple. Habitat & Ecology — Craterispermum rumpianum occurs in submontane forest with low canopy (15 – 20 m). Altitude 900 – 1400 m. Flowers: March; fruits: April (immature fruits). Distribution — Craterispermum rumpianum is endemic to Cameroon and only known from the Rumpi Hills in the South-west Region. Conservation status — Critically endangered. See Table 1. Critical remarks — Craterispermum rumpianum has only been collected twice. Brevistylous flowers and mature fruits were not available for description. Taxonomic affinities — Craterispermum rumpianum and C. schweinfurthii share subcapitate, compact inflorescences and closely, irregularly reticulate venation. However, C. rumpianum differs from C. schweinfurthii by its sessile inflorescences (vs pedunculate in C. schweinfurthii), its caducous stipules (vs persistent in C. schweinfurthii) and the size of the corolla tube (6.5 – 8 mm long in C. rumpianum vs 3.7 – 5.8 mm long in C. schweinfurthii). Additional specimens examined. CAMEROON, Dessein, Lachenaud, Lemaire, Sonké & Taedoumg 2584 (BR, YA), south-west, Rumpi Hills near Dikome Balue, 19 Apr. 2009.	en	Taedoumg, H., Hamon, P. (2013): Three new species of Craterispermum (Rubiaceae) from the Lower Guinea Domain. Blumea 57 (3): 236-242, DOI: 10.3767/000651913X663776, URL: https://doi.org/10.3767/000651913x663776
A63287F7FFACFFD8FD5BFC2BFD6DFAB7.taxon	etymology	Etymology. The species is named after Professor Doctor Bonaventure Sonké, specialist of Rubiaceae and Director of the Plant Systematic and Ecology Laboratory in Higher Teacher’s Training College of the University of Yaoundé I in Cameroon, for his contribution to the knowledge of African Rubiaceae. Shrub up to 3 m tall; all vegetative and generative parts glabrous; twigs greenish grey or brown, smooth but each internode with two decurrent ridges in line with the stipular tip. Stipules persistent; basal portion 2 – 3 mm long; tip narrowly triangular, 4 – 13 mm long. Leaves petiolate; petioles canaliculate, 5 – 10 mm long; leaf blades narrowly obovate 6.7 – 14 by 2 – 4.8 cm, subcoriaceous, greenish above, paler green below; base cuneate; apex acuminate-caudate, acumen 7 – 15 mm long; midrib prominent below; secondary venation slightly to moderately prominent on both surfaces, 10 – 12 pairs of secondary veins, secondary, inter-secondary and tertiary venation ± parallel and almost perpendicular to the midrib; quaternary venation ± obscure. Inflorescences pedunculate, axillary to slightly supra-axillary, borne 1 – 2 mm above the nodes, paired, opposite, subcapitate, 9 – 16 by 3 – 10 mm, few-flowered; peduncle flattened, 3 – 4 mm long; bracts and bracteoles very congested, triangular to ovate with long aristate apex, sometimes sparsely ciliate; bracts 5 – 9 mm long; bracteoles c. 4 mm long. Flowers presumed heterostylous (but only brevistylous morph known), 4 - merous, sessile. Brevistylous flowers: calyx green; tube c. 1 – 1.5 mm long; lobes linear, opposite lobes equal in length, largest pair c. 2 mm long and smallest pair 1 – 1.2 mm long, margins densely ciliate, sparse collecters present in the sini. Corolla white; tube narrowly cylindrical, 5 – 6.5 mm long, sparsely to densely pubescent at throat and in upper half of tube inside; lobes c. 3 mm long, moderately to densely pubescent inside, tips acute and thickened. Stamens with anthers completely exserted from corolla tube, inserted in the throat, c. 1.3 mm long, white; filaments c. 1.3 mm long. Ovary c. 1 mm long. Style and stigma included in the corolla tube, c. 5.5 mm long; stigma bilobed, stigmatic lobes c. 1.5 mm long. Fruits sessile, subglobose, asymmetrical, 8 – 7 mm diam (immature), crowned with persistent calyx, dark violet to black when ripe. Habitat & Ecology — Craterispermum sonkeanum occurs in humid forest on terra firma. Altitude 185 – 750 m. Flowers: November to February; fruits recorded in: January, August and October. Distribution — Craterispermum sonkeanum occurs in the continental part of Equatorial Guinea and in Gabon. The species is mostly collected from the National Park of Monte Alén and ‘ Monts de Cristal’. Conservation status — Endangered. See Table 1. Critical remarks — Flowers and fruits are rare on the specimens of C. sonkeanum. Only a few brevistylous flowers were available and measurements were based on two of them. Taxonomic affinities — Craterispermum sonkeanum and C. aristatum share long aristate bracts and bracteoles, short peduncles and subcapitate inflorescences. However, C. sonkeanum differs from C. aristatum by the following characters: stipules with long narrowly triangular tips in C. sonkeanum vs short and broadly triangular tips in C. aristatum, 10 – 12 pairs vs 5 – 6 pairs of secondary veins, 4 - merous vs 5 - merous flowers, unequal vs equal calyx lobes, closely and ± regularly reticulate vs laxly and irregularly reticulate higher order veins and by the smaller leaf blades (6.7 – 14 by 2 – 4.8 cm in C. sonkeanum vs 11 – 25.5 by 4 – 8 cm in C. aristatum). Additional specimens examined. EQUATORIAL GUINEA, Desmet, Nguema R & Nguema N 6 (BRLU), transect de Monte Chocolate, 16 Nov. 2002; Senterre & Ngomo 188 (BRLU), SO du Parc National de Monte Alén, sur le transect ECOFAC de Mosumo, 10 Feb. 2001; Senterre & Ngomo 280 (BRLU), SO du Parc National de Monte Alén, entre la station ECOFAC de Mosumo et Monte Boracho, 12 Feb. 2001; Senterre & Ngomo 582 (BRLU), SO du Parc National de Monte Alén, sur le transect ECOFAC de Mosumo, 3 Feb. 2001; Senterre & Ngomo 2010 (BRLU), SO du Parc National de Monte Alén, 2 km au NE du site de traversée du rio Uolo pour aller aux cataractas, 20 Jan. 2002; Senterre & Ngomo 3530 (BRLU), N du Parc National de Monte Alén, à proximité du transect ECOFAC de Monte Chocolate, 21 Nov. 2002; Van Reeth 332 (BRLU), Parc National de Monté Alén, transect de Mosumo, 30 Jan. 1998. – GABON, Hallé N 818 (P), Ngongolane, Monts de Cristal, 7 Aug. 1959; Hallé N 4434 (P), Monts de Cristal, chûtes de Kinguélé, rivière Mbei, 15 Jan. 1968; Leal, Nguema, Mounoumoulossi & Bissiemou 642 (BR), Monts de Cristal, Mbe National Park, Mt Mbilan Plateau, 26 Oct. 2005. Note — The plants from Gabon show more conspicuous decurrent ridges on the young branches and stipules with a less-developed tip than the plants from Equatorial Guinea.	en	Taedoumg, H., Hamon, P. (2013): Three new species of Craterispermum (Rubiaceae) from the Lower Guinea Domain. Blumea 57 (3): 236-242, DOI: 10.3767/000651913X663776, URL: https://doi.org/10.3767/000651913x663776
