Campylosiphon densiflorus (Schltr.) X.J.Li & D.X.Zhang, 2023

Li, Xiaojuan, Qu, Lu, Hu, Guoxiong & Zhang, Dianxiang, 2023, Revision of Campylosiphon (Burmanniaceae), with New Combinations and a New Species Described, Systematic Botany (Basel, Switzerland) 48 (3), pp. 395-409 : 408

5. Campylosiphon densiflorus (Schltr.) X.J.Li & D.X.Zhang , comb. nov. Burmannia densiflora Schltr. (1906, in: Bot. Jahrb. Syst. 38, p. 141) Burmannia congesta var. densiflora (Schltr.) D.X. Zhang (1999 , Dianxiang Zhang in: PhD thesis, Univ. of Hong Kong, Hong Kong SAR, p. 283). TYPE: CAMEROON. South-West Region: Moliwe, Stammler s. n. (holotype: B barcode B100165441!).

Fully mycoheterotrophic perennial herbs, translucent white. Stems thick filiform, succulent, 10–26 cm long; roots robustly fibrous; rhizomes tuberous; leaves sparsely beset on the stem, brownish; stem leaves ovate-triangular, acute, appressed, 3.5–6.8 mm long; inflorescence a double cincinnus with l0–30 flowers; bracts ovate-triangular, acute, 3–5 mm long; flowers 6–20 mm long, distinctly pedicellate, pedicel 2.1–3.6 mm long; perianth white with yellow lobes; perianth tube cylindrical, 3–9 mm long, wingless; outer perianth lobes broad ovate-triangular, thin, acute, with involute margins, 1.2–2.2 mm long; inner lobes spathulate, apex rounded, thin, revolute, ca. 1.1 mm long; stamens sessile or with short, thick filaments, inserted on the perianth throat; connective with two short arms bearing the thecae, a median point directed inward, apical crests and basal pendant spur lacking; style filiform, bearing at the apex three subsessile stigmas; style and stigmas together as long as the perianth tube; ovary ellipsoid to sub-globose, 2–4 mm long; capsule sub-globose, dehiscing by non-transverse slits; seeds sub-globose, numerous.

Phenology —Flowering and fruiting year round with the peak from December to February.

Distribution and Habitat — Campylosiphon densiflorus is distributed in Cameroon, Central African Republic, Oubangui-Chari, Gabon, and the Democratic Republic of the Congo. This species is usually found on the wet forest floor among leaves litters, and its tuberous rhizome is deeply buried in mud.

Additional Specimens Examined — Cameroon. — 13.5 km from Kribi, Ebolowa road, JJ Bos 3443 (BR0000019811802, P01757263 and WAG.1489096). — KRIBI-EBOLOWA: 16KM, P Bamps 1656 (BR0000019811796). — LITTORAL: Lac Tissongo Douala-Edea Reserve , DW Thomas 174 (YA0032344). — MeKOASSI: 24KM sw Ambam, J. & A. Raynal 9949 (P01757264 and P01757267). — NKAU NDJOK: R Letouzey 12399 (P01757262). — SOUTH REGION: Bipinde, Urwaldyebiet, G Zenker 4357 (BR0000019811819, E00044116, L.1486487 and P01757266) ; Bipinde, Mimfia, G Zenker s.n. (U.1173845); precise locality unknown, G Zenker s.n. (U.1173844); Bipinde,

Fundort, G Zenker s.n. (P01757265). Central African Republic. — YALINGA: Haut Oubangui, G Le Testu s.n. (BR0000019811826 and P01757261). — OUBANGUI-CHARI, Oubangui, Charles Tisserant 75 (P01757268 and P01757269). Gabon. — ESTUAIRE: c. halfway Kinguele–Tchimbele, JJFE de Wilde, JC Arends, AM Louis & JJ Wieringa 10079 (WAG.0110147); Left bank of the Mbei River, downstream of the hydroelectric power station at Kinguele, JJFE de Wilde, JC Arends, AM Louis, JJ Karper & F Bouman 206 (WAG0131648). — MOYEN- OGOOUe: near Rigsite, c. 10 km S of Lake Ezanga, FI van Nek 620 (WAG.0110146); Ezanga, Layon C est, CM Wilks 2467 (WAG.0198771). — OGOOUe- MARITIME: JJFE de Wilde & LJG van der Maesen 10912 (WAG.0055030). — OGOOUe- IVINDO: MEE Hijman & JCA Weerdenburg 355 (U.0041281). — WOLEU-NTEM: Crystal mountains, locality unknown N Halle & JF Villiers 4569 (P02144507); Crystal mountains, 1 km W of Tchimbele, JJ Wieringa 235 (WAG.0177806); Bissok, Le Testu 8976 (P02144504 and P02144505). Democratic Republic of the Congo. — TSHOPO: Yangambi, J Leonard 1620 (BR0000019811833); 15 km north of Yambao, J Louis 15425 (BR0000013161361).