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Senegalia pennata (L.) Maslin, Nuytsia 22(6): 466 (2012)
Name Status. Accepted Name
Classification. This species contains 2 infraspecific taxa ( subsp. insuavis, subsp. pennata)
Notes. (1) As noted by Nielsen (1980: 350), in previous years Acacia (Senegalia) pennata had been combined with A. (Senegalia) megaladena by many authors. Nielsen followed Brenan & Exell (1957) in regarding these two entities as distinct species, an approach adopted under Senegalia by Maslin et al. (2013), Maslin (2015), Deshpande et al. (2019) and Maslin et al. (2019). Senegalia pennata is now considered as comprising two subspecies, subsp. pennata and subsp. insuavis. Supplementary information was provided by Maslin et al. (2019: 427): "Originally Brenan and Exell (1957) demonstrated that Acacia pennata is a species that is restricted to Asia and did not occur in Africa as previously thought. Subsequently, Nielsen (1980) recognised four subspecies within the species, namely: subsp. pennata, subsp. insuavis, subsp. hainanensis (with A. macrocephala given in synonymy) and subsp. kerrii. It is this classification that became widely adopted, not only in China but also in South East Asia and elsewhere. However, the broad concept of A. pennata by Nielsen (1980) brought together disparate taxa (united primarily by having narrow, acute leaflets), many of which we consider warrant recognition as separate species. Therefore, following a reassessment of Nielsen's classification we consider it more appropriate that Senegalia pennata be more narrowly defined, containing just subsp. pennata and subsp. insuavis. Subspecies hainanensis and subsp. kerrii are treated as distinct species, S. hainanensis and S. kerrii respectively, and A. macrocephala has been resurrected as S. macrocephala. Furthermore, a new species, Senegalia stipitata, is recognised; this species incorporates the specimens from Vietnam with stipitate petiole glands that Nielsen (1980) noted under A. pennata subsp. hainanensis. These five species can be most readily distinguished from one another by their leaf gland morphology, position and orientation of the main vein of the leaflets, and the presence or absence of dark-coloured resin hairs on their inflorescence. We regard the above as a more workable classification than that of Nielsen (1980), and one that facilitates discussion of relationship between the species and their relatives.". (2) In India, Chakrabarty and Gandopadhyay (1996: 620-621) adopted a broad concept of Acacia pennata in India, including within its synonymy a number of entities that are here regarded as distinct taxa of Senegalia, namely, Acacia megaladena, A. arrophula and A. pennata var. arrophula (=Senegalia megaladena), A. donaldii (=S. donaldii), A. insuavis and A. pennata subsp. insuavis (=S. pennata subsp. insuavis), and A. macrocephala (=S. macrocephala); they also included A. canescens as a synonym of A. pennata, but the taxonomic status this entity requires further study.
Mimosa pennata L. (1753) [Basionym]
Acacia pennata (L.) Willd. (1806) [Homotypic synonym]
Acacia pennata var. pennata (1842) [Autonym]
Acacia pinnata Dalzell & A.Gibson (1861) [Orthographic variant]
Acacia pennata var. heyneana Benth. (1842) [Heterotypic synonym]
Acacia canescens Graham (1831-32) [Nom. nudum]
Acacia pennata var. canescens Graham ex Kurz ("1876" publ. 1877) [Heterotypic synonym]
Acacia pennata var. canescens Graham ex Baker (1878) [nom. illeg. (homonym)]
Acacia canescens Graham ex Gamble (1919) [nom. illeg. (homonym)]
Acacia canescens Graham ex Gamble var. canescens (1922) [Autonym]
Acacia canescens var. albida Haines (1922) [Heterotypic synonym]
Acacia canescens var. fulva Haines (1922) [Heterotypic synonym]
Acacia grahamii Vajr. (1983) [Heterotypic synonym]
AFRICA [I]: Egypt. AUSTRALIA [I]: Northern Territory, Queensland. EAST ASIA [N]: China (Guangdong, Guangxi, Yunnan). INDIAN SUBCONTINENT: India (Andhra Pradesh [N], Chhattisgarh [U], Karnataka [N], Kerala [N], Madhya Pradesh [U], Maharashtra [N], Sikkim [N], Tamil Nadu [N], Gujarat [U], West Bengal [U]), Sri Lanka [N]. NORTH AMERICA [I] (Florida). SOUTHEAST ASIA: Andaman Islands [U], Cambodia [I], Laos [I], Myanmar [N], Singapore [I], Thailand [I]
Abbreviations: [I - Introduced, N - Native, U - Uncertain].
Type. Based on Mimosa pennata L.