@ARTICLE{TreeBASE2Ref15582, author = {Peter Goldblatt and John C. Manning}, title = {Leaf and corm tunic structure in Lapeirousia (Iridaceae-Ixioideae) in relation to phylogeny and infragenetic classification.}, year = {1990}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Annals of the Missouri Botanical Garden}, volume = {77}, number = {}, pages = {365--374}, abstract = {The tropical and southern African Lapeirousia, comprising 35 species, divides into two subgenera on the basis of leaf type. Leaf anatomy of eight species of Lapeirousia and selected species of the other five genera of Watsonieae was examined and compared with that of the putatively primitive Pillansia. Lapeirousia subg. Lapeirousia has corrugate leaves that lack a distinct midvein and are anatomically specialized in having predominantly or exclusively alternate vascular bundles and square, truncate costal ridges in which the epidermal cells are abruptly enlarged and often heavily thickened in the outer periclinal walls. This derived leaf structure correlates with the specialized woody corm tunics of the subgenus. Subgenus Paniculata has plane leaves with a distinct midvein, vascular bundles usually opposite, and rounded costal ridges with epidermal cells gradually diminishing in size and usually without a heavily thickened outer periclinal wall, the basic type for the tribe. Species of subg. Paniculata also have hard corm tunics composed of densely compacted fibers, the basic type for the clade including Lapeirousia. Several morphological characters within both subgenera of Lapeirousia were used in the construction of a cladogram indicating the major lineages in the genus. This forms the basis for our infrageneric classification that recognizes two subgenera, each with two sections.} }

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