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Revision of Delissea (Campanulaceae-Lobelioideae)

Thomas G. Lammers
Systematic Botany Monographs
Vol. 73, Revision of Delissea (Campanulaceae-Lobelioideae) (Mar. 8, 2005), pp. 1-75
Stable URL: http://www.jstor.org/stable/25027934
Page Count: 75
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Revision of Delissea (Campanulaceae-Lobelioideae)
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Abstract

Delissea is a genus of soft-wooded shrubs, treelets, and palm-like trees endemic to the seven largest Hawaiian Islands; it is most closely related to the endemic Hawaiian genus Brighamia. Delissea is characterized by fleshy, glabrous, petiolate leaves drying membranous or slightly chartaceous and almost translucent; axillary racemose inflorescences with usually ebracteolate pedicels; small tooth-like calyx lobes; white or greenish bilabiate corollas with the curved tube slit dorsally for less than half its length and a distinct knob at the base of this slit (sometimes flanked by a pair of lateral knobs); free exserted staminal column; small dark purple thin-walled berries; large, dull white, transversely rugose seeds; and a chromosome number of 2n=28. Fifteen species, each endemic to a single island, are recognized here and divided among three sections on the basis of habit and floral features: sect. Delissea (four species), sect. Rhytidospermae (four species), and sect. Macranthae (seven species, one comprising two subspecies). Eleven species are presumed extinct, and the remaining four are critically endangered. One new section (Delissea sect. Rhytidospermae), two new species (D. takeuchii and D. waianaeensis), and two new combinations are proposed (D. kauaiensis, D. subcordata subsp. obtusifolia). As part of a nomenclatural review lectotypes are designated for two names at one time included in Delissea but now assigned to Cyanea: Rollandia delessertiana Gaudichaud and Cyanea floribunda F. E. Wimmer.

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