Clerodendrum welwitschii Gurke 1893
Creators: name: Meerts, Pierre
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Lamiaceae
Clerodendrum
Clerodendrum welwitschii

description: 28. Clerodendrum welwitschii Gürke (1893: 174); Baker (1900: 308); De Wildeman (1909: 138; 1912b: 91); Thomas(1936: 60); Huber (1963: 443); Lebrun & Stork (1997: 514); Lejolyet al.(2010: 295); Vande wegheet al.(2016: 744); Pollard (2022: 40)
≡ Siphonanthus welwitschii (Gürke) Hiern (Hiern 1900: 839).— Fig. 6.
Type:— ANGOLA. Golungo Alto, Bumba Quibixe, Sept. 1855, Welwitsch 5648 (lectotype designated here: K000192939!, isolecto-: BM000798621; COI00005739; G00366307; LISU223664; P00442392, PRE0590601-0).
Shrub or liana, up to 6 m high, 10 cm diam. at base. Stem terete, reddish, fulvous to rusty pubescent, solid, pith regularly interrupted, with thick persistent petiole bases 5–16(–22) mm. Leaf: petiole 1–8(–12) cm, unequal in length at a node; lamina: broadly ovate to ovate-elliptic, 6–21 × 3.5–14 cm, cordate to rounded at base, apex acuminate, 4–5 veins on either side, sightly impressed on upper surface, reticulum dense, prominent or not on upper surface, upper surface hispid (hairs ca. 1 mm), lower surface hispid on veins, pleasantly smelling when crushed, both surfaces often roughish, margin entire or occasionally somewhat undulate or subcrenate. Inflorescence terminal, a dense thyrse, ovoid to pyramidal, 3–15(–20) × 2–7.5(–10) cm, rachis densely pubescent, sometimes glandular, branches 5–25(–40) mm, at a narrow angle with rachis, peduncle 2–10 cm. Flower: pedicel 5–20 mm, densely pubescent, occasionally glandular, bracts linear to narrowly elliptic, 3–5 mm long; calyx funnel-shaped or bell-shaped, yellow-green, 9–15(–20) mm, base broadly obconical, more rarely rounded, lobed over more than half its length, lobes triangular to ovate-triangular, 5–10 × 2–5.5(–7) mm, 3–5-veined, pubescent on both surfaces, occasionally golden gland-dotted; corolla scented, tube 35–45 mm, greenish, sparsely glandular, more densely so near tip, lobes 7–9(–11) mm long, whitish, rose-spotted near throat, with glandular hairs on outer surface; stamens exserted 15–25 mm, anther 1.5–2 mm long. Fruit 9–11 × 8 mm, concealed in persistent calyx.
Distribution in Central Africa:—D.R. Congo.
Distribution elsewhere:— Angola, Central African Republic, Congo, Gabon, Mozambique, Nigeria, Somalia.
Habitat:—Forest fringe, young regrowth, secondary forest, rainforest, generally heliophilous; 300–1000 m.
Selection of representative specimens:—D.R. CONGO. Mayombe: Tshela, September 1952, Flamigni 10424 (BR!); Luki, 4 September 1957, Matton 23 (BR!); Gimbi, 23 August 1948, Toussaint 462 (BR!). Bas-Congo: Ngombe Ndiwu, 12 July 1953, Callens 4151 (BR!); Kisantu, 11 August 1935, Louis 26 (BR!); Kimuenza, 7 June 1967, Pauwels 5026 (WAG). Kasaï: Entre Kwanga-Wamba, rivière Twana, 30 July 1944, Germain 2498 (BR!); Sangaie (territ. Lusambo), November 1938, Gillardin 469 (BR!); Popokabaka, June 1925, Vanderyst 14816 (BR!). Forestier Central: Eala, 21 October 1937, Couteaux 377 (BR!); Yangambi, May 1938, Gilbert 1126 (BR!, P); Entre Gemena et Karawa, December 1930, Lebrun 1890 (BR!, P, US); Mobwasa, June 1913, Lemaire 341 (P); Lilanda (W Yangambi), 22 February 1936, Louis 1338 (BR!); Kotili (près de Buta), 11 December 1925, Robyns 1456 (WAG). Ubangui-Uele: Bodangabo, 19 February 1955, C. Evrard 288 (BR!).
Lectotypification of Clerodendrum welwitschii Gürke. G ü rke (1893) indicated Welwitsch 5648 as the type. This collection is represented by specimens in BM, COI, G, K, LISU, P and PR. All of them match the protologue. I select the specimen in K as the lectotype (K000192939).
description: Published as part of Meerts, Pierre, 2023, The genus Clerodendrum (Lamiaceae) in the flora of Central Africa (D. R. Congo, Rwanda, Burundi), pp. 1-42 in Phytotaxa 594 (1) on page 37, DOI: 10.11646/phytotaxa.594.1.1, http://zenodo.org/record/7864827