Amphistemon and Thamnoldenlandia, two new genera of Rubiaceae (Spermacoceae) endemic to Madagascar

被引：22
作者：
Groeninckx, Inge [1 ]
De Block, Petra [2 ]
Robbrecht, Elmar [2 ]
Smets, Erik E. [1 ,3 ]
Dessein, Steven [2 ]
机构：
[1] Katholieke Univ Leuven, Lab Plant Systemat, BE-3001 Louvain, Belgium
[2] Natl Bot Garden Belgium, BE-1860 Meise, Belgium
[3] Leiden Univ Branch, Natl Herbarium Netherlands, NL-2300 RA Leiden, Netherlands
来源：
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY | 2010年 / 163卷 / 04期
关键词：
Astiella delicatula; long-distance dispersal; molecular phylogenetics; scanning electron microscopy; taxonomy; PHYLOHYDRAX RUBIACEAE; TAXONOMIC REVISION; DNA MARKERS; PHYLOGENY; GENUS; POLLEN; BIOGEOGRAPHY; ANGIOSPERMS; RETENTION; EVOLUTION;
D O I：
10.1111/j.1095-8339.2010.01060.x
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
Amphistemon and Thamnoldenlandia are described as two new genera of Rubiaceae endemic to Madagascar. The two novelties belong to the predominantly herbaceous tribe Spermacoceae. Amphistemon is unique within the tribe in having its stamens inserted at two levels in the corolla tube. The genus includes two species: the subshrub A. humbertii and the geoxylic herb A. rakotonasolianus. Thamnoldenlandia includes only one species, T. ambovombensis, which differs from most other Spermacoceae in being a medium-sized shrub with winged seeds. We present a detailed description of Amphistemon and Thamnoldenlandia, including observations of pollen and seeds. A molecular phylogenetic study based on atpB-rbcL, petD, rps16 and trnL-trnF sequences demonstrates that the two new genera belong to the Hedyotis-Oldenlandia complex of tribe Spermacoceae. Amphistemon and Thamnoldenlandia are sister taxa and share a common ancestor with the Madagascan endemic genus Astiella. A second, but not closely related, Madagascan clade includes the endemic genera Lathraeocarpa and Gomphocalyx and the Afro-Madagascan genus Phylohydrax. This indicates that the Madagascan endemic members of Spermacoceae are the result of at least two independent colonization events, most likely by long-distance dispersal from the African mainland. (C) 2010 The Linnean Society of London, Botanical Journal of the Linnean Society, 2010, 163, 447-472.
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页码：447 / 472
页数：26
相关论文
共 82 条
[1]  
Andersson L, 2002, BRITTONIA, V54, P40, DOI 10.1663/0007-196X(2002)054[0040:RCABOA]2.0.CO
[2]  
2
[3]   The rps16 intron and the phylogeny of the Rubioideae (Rubiaceae) [J].
Andersson, L ;
Rova, JHE .
PLANT SYSTEMATICS AND EVOLUTION, 1999, 214 (1-4) :161-186
[4]  
[Anonymous], 1974, ISLAND BIOL
[5]   SELF COMPATIBILITY AND ESTABLISHMENT AFTER LONG DISTANCE DISPERSAL [J].
BAKER, HG .
EVOLUTION, 1955, 9 (03) :347-349
[6]  
BAKER HG, 1967, EVOLUTION, V21, P853, DOI 10.1111/j.1558-5646.1967.tb03440.x
[7]  
Baldwin Bruce G., 1997, P103
[8]   Island colonization and evolution of the insular woody habit in Echium L (Boraginaceae) [J].
Bohle, UR ;
Hilger, HH ;
Martin, WF .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1996, 93 (21) :11740-11745
[9]  
BREMEKAMP CEB, 1952, TWEEDE REEKS, V48, P1
[10]  
Brown SJ, 2001, NYU SA CTR SER F M I, V6, P1
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