Phyllotaxis of vegetative shoots, lamina rotation and their systematic implication in Magnoliaceae

Abstract

Phyllotaxis in vegetative shoots and lamina rotation of Magnoliaceae are described. Most genera in Magnoliaceae investigated (except Parakmeria, Manglietiastrum and Pachylarnax) show lamina rotation. Paraphoric, a new type of lamina rotation differing from four other types depicted by Charlton is clarified. Manglietia, Parakmeria, Manglietiastrum, Talauma, section Gwillimia and Rytidospermum in subgenus Magnolia, shoots of Woonyoungia, section Theorhodon and Liriodendron have spiral phyllotaxis, however Magnolia section Oyama and Maingola, Alcimandra, Michelia, Paramichelia, Tsoogiodendron, buds of Woonyoungia, section Theorhodon and Liriodendron have distichous phyllotaxis. The systematic implication of vegetative shoot phyllotaxis and lamina rotation in Magnoliaceae is discussed in this paper.

The significance of γ-and λ-dislocations in transient states of phyllotaxis: how to get more from less – sometimes!

“…Here, in Fig. 1 it can be seen that distichy is also present in the vegetative shoots of magnolia [59]. Among many other primeval traits it is likely evidence of the common ancestry of this early divergent lineage of flowering plants and monocots [19,60].…”

Manglietia lawii sp. nov. (Magnoliaceae) from Yunnan, China

“…Based on overlap of many morphological characters, Nooteboom (2000) and Figlar and Nooteboom (2004) merged Manglietia with Magnolia L. However, numerous studies of e.g. karyomorphology (Meng et al 2006, Zhang and Xia 2007), molecular data (Azuma et al 2000, 2001, Shi et al 2000, Ueda et al 2000, Kim et al 2001, Wang et al 2006, Nie et al 2008), morphological cladistic analysis (Li and Conran 2003), cross‐compatibility (Gong et al 2001), and morphological characters (Baranova 1972, Tucker 1977, Liao and Xia 2007) support that Manglietia should be treated as a distinct genus.…”

Manglietia lawiisp. nov. (Magnoliaceae) from Yunnan, China

“…Based on overlap of many morphological characters, Nooteboom (2000) and Figlar and Nooteboom (2004) merged Manglietia with Magnolia L. However, numerous studies of e.g. karyomorphology (Meng et al 2006, Zhang and, molecular data (Azuma et al 2000, Shi et al 2000, Ueda et al 2000, Kim et al 2001, Wang et al 2006, Nie et al 2008, morphological cladistic analysis (Li and Conran 2003), cross-compatibility (Gong et al 2001), and morphological characters (Baranova 1972, Tucker 1977, Liao and Xia 2007) support that Manglietia should be treated as a distinct genus.…”