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FLORAL ANATOMY AND MORPHOLOGY OF SOME SPECIES OF THE GENUS VIBURNUM OF THE CAPRIFOLIACEAE
Author(s) -
Wilkinson Antoinette Miele
Publication year - 1948
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1948.tb08107.x
Subject(s) - caprifoliaceae , viburnum , genus , biology , citation , correct name , morphology (biology) , botany , library science , zoology , computer science
PREVIOUS PAPERS (Wilkinson 1948a, 1948b) have considered the Lonicereae, Linnaeeae, and Sambuceae. This paper will concern itself exelusively with Viburnum, by far the most interesting genus studied, both morphologically and anatomieally. It shows the greatest reduction and greatest complexity of any genus studied. Viburnum differs from Sambucus in its simple leaves and one-stoned drupe. The fourteen species studied fall into seven sections. The two sectionsTinus and Megalotinus-with V. Davidi and V. cylindricum respectively are not represented. Rehder's (1940) taxonomic disposition of the species included in this study is as follows: Sect. Thyrsoma, V. Sieboldii; Sect. Lantana, V. Carlesii, V. Lantana, V. rhitidophyllum; Sect. Pseudotinus, V. alnifolium; Sect. Pseudopulus, V. tomentosum; Sect. Lentago, V. nudum, V. cassinoides, V. Lentago; Sect. Odontotinus, V. dilatatum, V. dentatum, V. acerifolium; Sect. Opulus, V. trilobum, V. Opulus. DESCRIPTIVE MORPHOLOGY.-As will be seen the anatomy gives only general support to this grouping. The anatomical characteristics of the groups of species have not become adequately set off to mark clearly the limits of the various groups. The anatomy and morphology do however, give the trend of evolution in the genus and show that the carpellary structure is far more complex than macroscopic examination would indicate. In the main part of the ovary, there is a single locule with the single fertile ovule pendulous in its uppermost part (fig. 3). In the upper part of the ovary at the level of attachment of tbe fertile ovule, two more locules become evident. These are small and may contain one or more minute sterile ovules. Above the attachment of the fertile ovule, all three locules merge into a single 3-lobed locule. In this paper, the relatively well developed locule which is seen macroscopically in the body of the ovary will be referred to as the ovule-containing locule, the two small locules as abortive or atrophied locules, and the chamber resulting from the fusion of all three of these as the 3-lobed or compound locule. The ovule-containing locule is usually excentric (fig. 4, 5, 10). Below the attachment of the ovule,