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Rosselia, a New Genus of Burseraceae from the Louisiade Archipelago, Papua New Guinea

L. L. Forman, R. W. J. M. van der Ham, M. M. Harley and T. J. Lawrence
Kew Bulletin
Vol. 49, No. 4 (1994), pp. 601-621
Published by: Springer on behalf of Royal Botanic Gardens, Kew
DOI: 10.2307/4118063
Stable URL: http://www.jstor.org/stable/4118063
Page Count: 21
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Rosselia, a New Genus of Burseraceae from the Louisiade Archipelago, Papua New Guinea
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Abstract

A new genus of Burseraceae, Rosselia Forman, is described. Its single species R. bracteata Forman is known from only two collections made on Rossel I. in the Louisiade Archipelago off the southeastern end of Papua New Guinea. The genus is distinctive in the conspicuous foliaceous bracts borne along the elongate inflorescences. The gross morphology is discussed; features of the trimerous flowers and the endocarps composed of three fused pyrenes indicate that Rosselia belongs in the tribe Canarieae. The anatomy of the leaf and young stem is described and the presence of features typical of Burseraceae is confirmed. A comparison is made of four significant anatomical characters of Rosselia and their distribution in the rest of Burseraceae; the greatest resemblance is found to be with tribe Canarieae, followed by Protieae. The pollen morphology is described and the pollen is found to be a distinctive type dissimilar to all known pollen types in the Burseraceae. Certain features, however, notably the lalongate, costate endoapertures, occur in other genera of the family. The unusual pollen of Rosselia is considered in the light of other pollen types unique to particular genera of Burseraceae. Reasons for the disparity of the pollen of Rosselia within the family are suggested.

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