Clerodendrum baumii Gürke (in Warburg 1903: 351 )

Meerts, Pierre, 2023, The genus Clerodendrum (Lamiaceae) in the flora of Central Africa (D. R. Congo, Rwanda, Burundi), Phytotaxa 594 (1), pp. 1-42 : 5

1. Clerodendrum baumii Gürke (in Warburg 1903: 351) ; Thomas (1936: 62); Moldenke (1985c: 190); Lebrun & Stork (1997: 510); Fernandes (2005: 99); Goyder & Gonçalves (2019: 87).— Fig. 1 .

Type:— ANGOLA. Am linken Longa-Ufer, oberhalb des Lazingua, 1220 m, 20 January 1900, Baum 661 (holotype: B†; iso-: E00043057, G00366326, W19010006834, Z-000029570).

A geofrutex 0.6–1.2(–1.5) m in height. Stem quadrangular, shortly pubescent or papillate, generally unbranched, internodes shorter than leaves, often leafless in lower third at flowering. Leaves opposite or 3-whorled, upright, petiole 5–23 mm, shortly pubescent; lamina ovate to subdeltoid, 2.5–5.5 × 1.0– 3.4 cm, decreasing in size from base to top, base cuneate to truncate, shortly decurrent on the petiole, apex acute to shortly acuminate, shortly pubescent on both surfaces, punctate, 3–4 veins on either side, margin entire, recurved. Inflorescence a thyrse, paniculiform, 5–20 × 3–8 cm (corolla excluded), occasionally with axillary cymes lower on the shoot, internodes 2–3 cm, rachis angled, branches 1–2 cm, shortly pubescent, bracts leaf-like but smaller. Flower: pedicel 20–30 mm, shortly pubescent; calyx campanulate, 10–16 mm long at flowering, 18–23 mm long in fruit, 12–16 mm broad at base, truncate at base, lobed to 1/3–1/2, lobes triangular, acute to acuminate, (3–) 5–12 mm long in flower, sparsely pubescent to subglabrous; corolla tube ca. 100 mm, shortly pubescent, with glandular and eglandular hairs, lobes ca. 5 mm long, cream to yellowish, pubescent; stamen filaments exserted 10–25 mm, reddish. Fruit ca. 9 mm long (rarely observed).

Distribution in Central Africa:—D.R. Congo (Kasaï).

Distribution elsewhere:— Angola and Zambia.

Habitat:—Shrub and wooded savannah, Uapaca dry woodland, often of sandy soil; 600–700 m.

Selection of representative specimens:— D.R. CONGO. Kasaï: Mawanga , 28 April 1953, Callens 4032 (BR!); 50 km S of Munene, 30 April 1948, Duvigneaud 814 (BRLU!); Kwango, Panzi, 12 Jun. 1955, Devred 1998 (BR!); Masabu, ca. 20 km SE Popokabaka, 27 April 1944, Germain 2194 (BR!) .

Figures

FIGURE 1. Clerodendrum baumii (Jernandez 26 and Devred 1998 (BR)). (A) Habit. (B) Leaf tip underside. (C) Portion of corolla tube. Drawing by Hilde Orye, Botanical Garden Meise (©).