Englerodendron Harms, 1907

Breteler, F. J., 2006, Novitates Gabonenses 56. Two Anthonotha species from Gabon transferred to Englerodendron (Fabaceae, Caesalpinioideae), Adansonia (3) 28 (1), pp. 105-111 : 107-109

Genus Englerodendron Harms

Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 40: 27, fig. 2 (1907); Léonard , Académie royale de Belgique, Classe des Sciences , Mémoires in 8 o 30 (2): 199 (1957); Brenan , Leguminosae , Caesalpinioideae, Flora of Tropical East Africa: 149 (1967). — Type: Englerodendron usambarense Harms .

Leonardendron Aubrév. , Adansonia , sér. 2, 8: 167 (1968); Flore du Gabon 15: 244 (1968), syn. nov.

TYPE. — Leonardendron gabunense (J.Léonard) Aubrév.

KEY TO THE SPECIES OF ENGLERODENDRON HARMS

1. Stipules large, enveloping the leaf axil, 1-4.5 cm long ( Fig. 1C ); bracteoles 15-20 mm long; petals narrowly obovate (15-) 20-30 mm long, 5-10 mm wide, ± as long as the fertile stamens. Lower Guinea.............................................................. 1. E. conchyliophorum

— Stipules 1-6 mm long, not enveloping the leaf axil ( Fig. 1G, H, K, L ); bracteoles 7-12 mm long; petals oblanceolate 10-12(-15) mm long, 1-2.5 mm wide, distinctly shorter than the fertile stamens ...................................................................................................... 2

2. Leaves almost sessile, the lowest pair of leaflets subsessile, resembling large leafy stipules ( Fig. 1G, H ); sepals, petals, and filaments glabrous. Cameroun, Gabon................... ............................................................................................................. 2. E. gabunense

— Leaves distinctly petiolate, the lowest pair of leaflets distinctly petiolulate, not resembling large leafy stipules ( Fig. 1K ); sepals and petals ciliolate, filaments pubescent. Tanzania.... .......................................................................................................... 3. E. usambarense

1. Englerodendron conchyliophorum (Pellegr.) Breteler , comb. nov. ( Figs 1 A-C; 2A; 3)

Macrolobium conchyliophorum Pellegr. , Bulletin de la Société botanique de France 88: 503 (1941), p.p.; Mémoires de l’Institut d’Études centrafricaines 1: 45 (1948), p.p. — Type: Gabon. Near Lastoursville, Micouma, fl., 23.XI.1929, Le Testu 7680 (lecto-, P!; iso-, WAG!; designated by Pellegrin [1948]), see Remarks.

Anthonotha conchyliophora (Pellegr.) J.Léonard, Académie royale de Belgique, Classe des Sciences, Mémoires in 8 o 30 (2): 223 (1957), p.p., see Remarks.

Isomacrolobium conchyliophorum (Pellegr.) Aubrév. & Pellegr. , Bulletin de la Société botanique de France 104: 498 (1957), p.p.; Aubrév., Flore du Gabon 15: 190, fig. 44 (1968), p.p., see Remarks.

SPECIMENS EXAMINED. — Cameroun. Thump Mt. , Onge, ster., XI.1993, Thomas 9860 ( WAG!) .

Gabon. Micouma near Lastoursville, fl., XI.1929, Le Testu 7680 ( P!, WAG!, type) . — Loango Nat. Park Akaka, fl., XI.2004, Mouandza et al. 331 ( LBV, WAG!) . — Doudou Mts. , 40 km NW of Doussala, ster., IV.2000, Sosef et al. 1151 ( LBV, WAG!) . — Moukalaba , Doudou Nat. Park, ster., II.2004, Van Valkenburg et al. 2788, 2793a ( LBV, WAG!) .

Nigeria. Oban Group F. R ., West Block , fl., V.1971 , Van Meer 1574 ( WAG!) .

HABITAT AND DISTRIBUTION. — Rain forest of Lower Guinea. Altitude 0-500 m.

REMARKS

Léonard (1957) and Aubréville (1968b) cited the Paris specimen of Le Testu 7680 as the holotype of this species. This is not correct. In the original publication, Pellegrin (1941) cited Le Testu 7680 and Le Testu 5740 without indicating the type. Designation of a type was done in his Les légumineuses du Gabon in 1948, where the number 7680 was indicated as type, which in fact is a lectotypification. The other syntype Le Testu 5740 is not conspecific. It has only 3 fertile stamens and 6 staminodes as described by Pellegrin (1941, 1948). It is identified as Anthonotha isopetala (Harms) J.Léonard var. macrantha (J.Léonard) J.Léonard. Pellegrin’s description in the protologue shows quite well which part derives from which of the two syntypes. The shape of the stipules, from which the epithet “ conchyliophorum ” is derived, is from Le Testu 7680 as well as e.g., the large bracteoles.

Aubréville’s concept of Isomacrolobium conchyliophorum in the Flore du Gabon is also based on these two specimens of Le Testu, in the description as well as in his illustration. The elements 2 and 3 of planche 44 are after Le Testu 7680, the numbers 1, 4, 5 and 6 after Le Testu 5740.

Figures

FIG. 1. — Englerodendron species:A-C, E.conchyliophorum (Pellegr.) Breteler;A, flower;B, flower longitudinal section;C, leaf axil with stipules; D-H, E. gabunense (J.Léonard) Breteler; D, flower; E, flower opened up; F, flower part showing, sepals,petals,stamens, and staminodes; G, H, leaf axil with enlargement; I-L, E. usambarense Harms; I, flower, some petals and some stamens missing; J, flower longitudinal section; K, L, leaf axil with enlargement. Abbreviations: a, axillary bud; s, stipule. A-C, Van Meer 1574; D, E, Breteler et al. 11081; F, Le Testu 7808; G, H, Breteler et al. 11174; I, J, Semsei 2942; K, L, Peter 48574. Drawing by H. de Vries. Scale bars: A, B, D-F, I, J, 1 cm; C, G, K, 3 cm; H, 5 mm, L, 1 mm.