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B othalia 21,1: 1 -2 5 (1991) Erythrineae (Fabaceae) in southern Africa E.F. FRANKLIN HENNESSY* Keywords; Erythrina, Erythrineae. Fabaceae. M ucuna, pollination, revision, southern Africa, taxonomy ABSTRACT The two genera represented in the flora of southern Africa. Erythrina L. and Mucuna Adans. are revised. Keys to the indigenous species and the commonly cultivated exotic species are provided. U1TTREKSEL Die twee inheemse genusse, Erythrina L. en Mucuna Adans. word hersien. Sleutels vir die inheemse spesies en vir uitheemse spesies wat gewoonlik gekweek word, word voorsien. CONTENTS Section Erythrina ........................................................ 15 21. E. pallida ............................................................ 15 Erythrineae .........................................................................1 22. E. aff. E. x sykesii ......................................... 15 Key to indigenous genera .............................................2 Specimens examined (Erythrina) ............................... 16 Erythrina ........................................................................... ..2 Mucuna ........................................................................... 17 Pollination and floral morphology ..............................3 Pollination and economic importance ...................... 18 Economic uses ................................................................3 Subgenus Mucuna ........................................................ 18 Key to the subgenera of Erythrina (world-wide) ... 3 Subgenus Stizolobium .................................................. 18 Synonymy of all subgenera and sections represented Key to indigenous species ........................................... 18 in southern Africa ...................................................3 1. M. gigantea .............................................................. 18 Key to the indigenous subgenera and sections ........4 2. M. pruriens ............................................................ 19 Key to indigenous species ............................................4 var. pruriens .............................................................. 19 1. E. abyssinica ......................................................... ..4 var. utilis .................................................................... 19 2. E. latissima ..............................................................5 3. M. coriacea ............................................................ 21 3. E. decora ..................................................................7 Specimens examined (Mucuna) ................................ 21 4. E. mendesii ..............................................................7 Acknowledgements ......................................................... 23 5. E. lysistemon ............................................................7 References ........................................................................23 6. E. caffra .................................................................. .9 7. E. humeana ..............................................................9 8. E. zeyheri ..................................................................10 9. E. acanthocarpa ..................................................... .11 ERYTHRINEAE Natural hybrids ..............................................................11 10. E. x coddii ........................................................... .11 Tribe Erythrineae Hutch., The genera of flowering 11. E. x johnsoniae .....................................................12 plants 1: 431 (1964); Dyer: 230 (1975). Tribe Phaseoleae 12. E. x dyeri ..............................................................12 DC., subtribe Erythrininae Benth.: IB (1837); Benth.: 452 13. E. x hennessvae .................................................. .12 (1865); Lackey: 312 (1981). Type genus: Erythrina L. Exotic species of Erythrina common in cultivation in southern Africa ..................................................12 Trees, shrubs, suffrutices, woody lianes or herbaceous Synoptic key to exotic species ..................................12 climbers. Leaves stipulate, stipellate, trifoliolate; foliar and Section Duchassaignia ............................................... .13 foliolar pulvini present. Inflorescences terminal or axillary, 14. E. fusca .................................................................13 paniculate, pseudoracemose, subumbellate or consisting Section Cristae-galli .................................................. .13 of fascicles of flowers scattered along a leafy axis. Flowers 15. E. crista-galli ........................................................13 non-resupinate or resupinate. Calyx gamosepalous; tube 16. E. falcata .............................................................. .14 various; limb of 5 lobes or teeth or obsolete, variously Section Micropteryx .....................................................14 hirsute or glabrous. Corolla papilionaceous; petals 17. E. poeppigiana .....................................................14 glabrous, velutinous or hairy. Stamens (9) + 1 or (10); Section Macrocymbium ...............................................14 anthers monomorphic or dimorphic; intrastaminal 18. E. senegalensis .....................................................14 nectariferous disc present. Ovary sessile or stipitate, few- 19. E. livingstoniana ..................................................14 or many-ovulate; style terete, straight or incurved, glabrous Section Stenotropis ..................................................... .15 or proximally pubescent; stigma terminal, capitate, small. 20. E. speciosa ...........................................................15 Fruit dehiscent along both sutures or one suture; pericarp ligneous, subligneous, coriaceous or chartaceous, glabres- cent or hirsute. Seeds exendospermic, smooth, brown, red Department of Botany, University of Durban-Westville, Private Bag X54001. Durban 4(XK).' or particoloured; hilum short or girdling; rim aril incon MS received: 1990-04-01. spicuous or conspicuous. 2 Bothalia 21,1 (1991) An artificial assemblage of nine genera, the relationships Hypaphorus Hassk.: 197 (1858). Type species: Hypa- of which are obscure, grouped together for convenience phorus subumbrans Hassk. = Erythrina subumbrans rather than by conviction. Representatives of two genera, (Hassk.) Merrill. Erythrina and Mucuna are indigenous in the FSA region. Trees, or shrubs, or suffrutices with enlarged subterra KEY TO INDIGENOUS GENERA nean rootstocks; armed with conical or falcate prickles; variously hirsute. Leaves synanthous or hysteranthous, Carina shorter than vexillum; anthers monomorphic, sub- pinnately trifoliolate, deciduous, stipulate; stipules per basifixed; fruit glabrescent, often moniliform; stipels sistent or caducous; leaflets stipellate; stipellae glandular glandular or, rarely, coriaceous; trees, shrubs or suf- or coriaceous. Inflorescences subterminal or axillary frutices ....................................................................................... Erythrina pseudoracemes, contemporary with the leaves or preco Carina exceeding vexillum; anthers dimorphic, alternately dorsifixed or versatile and sub-basifixed, the shorter cious. Flowers subverticillate in groups of 3, bracteate; often bearded; fruit with indumentum of irritant hairs; bracts and bracteoles hirsute, caducous. Calyx gamo- stipels non-glandular; woody lianes or climbing herbs sepalous, variously hirsute; tube narrowly or broadly ............................................................................................ Mucuna (p. 17) campanulate, truncate or shallowly bilabiate or spatha- ceous; limb well developed with 5 long or short lobes, ERYTHRINA obsolescent or obsolete. Corolla papilionaceous; vexillum conduplicate-falcate, shortly clawed, minutely velutinous Erythrina L Species plantarum edn 1: 706 (1753); or subglabrous; alae falcate, shortly clawed, sometimes L.: 316 (1754a); Lam.: 392 (1786); DC.: 411 (1825); auriculate near base; carina petals free or connate, shortly Spreng.: 243 (1826); Guill., Per. & A. Rich.: 224 (1832); clawed, rarely auriculate. Stamens 10, monadelphous, or E. Mey.: 15 (1836); A. Rich.: 213 (1847); Harv.: 236 diadelphous with the vexillary stamen free or partly (1862); Benth.: 531 (1865); Bak.: 181 (1871); Bak.: 188 coherent; anthers uniform, sub-basifixed, bithecate with (1876); Taub.: 363 (1894); Harms: 659 (1915); Phillips: 336 longitudinal dehiscence. Ovary stipitate, linear, multi- (1926b); Hutch.: 406 (1927); Bak. f.: 370 (1929); Burn ovulate, densely tomentose; style terminal, straight or Davy: 415 (1932); Louis: 295 (1934-5); Collett: 219 (1941); incurved, hirsute proximally, glabrous distally; stigma Phillips: 422 (1951); Hepper: 562 (1954); Majot-Rochez small, capitate, terminal. Fruit usually falcate, moniliform, & Duvign.: 120 (1954); Codd: 507 (1955); Torre: 247 ligneous or subligneous, smooth or aculeate, dehiscing (1966); Schreiber: 38 (1970); Verde.: 541 (1971); Hennessy: along adaxial suture. Seeds red or brown, smooth, elliptic; 1 (1972); Krukoff & Barneby: 332 (1974); Dyer: 269 (1975); hilum short; rim aril inconspicuous. 2n = 42. Compton: 277 (1976); Troupin: 306 (1982). Type species: Erythrina corallodendrum L. A genus of more than 100 species distributed through out the tropics and subtropics. Nine indigenous species Corallodendron Mill.: 372 (1754); Kuntze: 172 (1891). occur in the FSA region of which E. decora and E.