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A New Lineage-Based Tribal Classification of the Family Caryophyllaceae

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A New Lineage-Based Tribal Classification of the Family Caryophyllaceae Int. J. Plant Sci. 171(2):185–198. 2010. Ó 2010 by The University of Chicago. All rights reserved. 1058-5893/2010/17102-0006$15.00 DOI: 10.1086/648993 A NEW LINEAGE-BASED TRIBAL CLASSIFICATION OF THE FAMILY CARYOPHYLLACEAE Danica T. Harbaugh,1,* Molly Nepokroeff,y Richard K. Rabeler,z John McNeill,§ Elizabeth A. Zimmer,* and Warren L. Wagner* *Department of Botany, National Museum of Natural History, Smithsonian Institution, MRC166, P.O. Box 37012, Washington, D.C. 20013-7012, U.S.A.; yDepartment of Biology, University of South Dakota, 177 Churchill-Haines, Vermillion, South Dakota 57069, U.S.A.; zUniversity of Michigan Herbarium, 3600 Varsity Drive, Ann Arbor, Michigan 48108-2228, U.S.A.; and §Royal Botanic Garden, Edinburgh EH3 5LR, Scotland, United Kingdom Understanding the relationships within the Caryophyllaceae has been difficult, in part because of arbitrarily and poorly defined genera and difficulty in determining phylogenetically useful morphological characters. This study represents the most complete phylogenetic analysis of the family to date, with particular focus on the genera and relationships within the large subfamily Alsinoideae, using molecular characters to examine the monophyly of taxa and the validity of the current taxonomy as well as to resolve the obscure origins of divergent taxa such as the endemic Hawaiian Schiedea. Maximum parsimony and maximum likelihood analyses of three chloroplast gene regions (matK, trnL-F, and rps16) from 81 newly sampled and 65 GenBank specimens reveal that several tribes and genera, especially within the Alsinoideae, are not monophyletic. Large genera such as Arenaria and Minuartia are polyphyletic, as are several smaller genera. The phylogenies reveal that the closest relatives to Schiedea are a pair of widespread, largely Arctic taxa, Honckenya peploides and Wilhelmsia physodes. More importantly, the three traditional subfamilies (Alsinoideae, Caryophylloideae, and Paronychioideae) are not reflective of natural groups; we propose abandoning this classification in favor of a new system that recognizes major lineages of the molecular phylogeny at the tribal level. A new tribe, Eremogoneae Rabeler & W.L. Wagner, is described here. Keywords: Alsinoideae, Caryophyllaceae, Eremogoneae, molecular phylogeny, Schiedea. Online enhancement: appendix table. Introduction and Hartman (2005) recognized a fourth subfamily, Polycar- poideae Burnett [Polycarpaoideae Beilschm.], including there The family Caryophyllaceae Juss., the pink or carnation the species of the Paronychioideae with capsular fruits. This family, is cosmopolitan and includes a number of common or- scheme is also consistent with treating the Paronychioideae namental plants, such as carnations (Dianthus L.) and baby’s sensu stricto as a separate family, the Illecebraceae R. Br. breath (Gypsophila L.). The family is primarily Holarctic in (Hutchinson 1973). Takhtajan (1997) recognized the ‘‘tradi- distribution, with diversity centered in the Mediterranean and tional’’ three subfamilies as well as Scleranthoideae Arn., into Irano-Turanian regions (Bittrich 1993), and includes ;3000 which Scleranthus L. and Pentastemonodiscus Rech.f. were species distributed among 88 genera (Rabeler and Hartman segregated from the Alsinoideae. He reverted to three subfam- 2005). The number of genera declines to 82 if one accepts ilies in his most recent work (Takhtajan 2009), returning these a broad concept of Silene (see Greuter 1995; Morton 2005a) genera to a tribe within the Alsinoideae. or could increase to more than 120 if one accepts all the segre- Understanding the relationships within the Caryophyllaceae gates of several of the large genera that have been proposed has been difficult, in part because many of the genera are not (see Oxelman et al. 2001; Tzvelev 2001). The most common well defined morphologically and are difficult to distinguish classification (Pax and Hoffman 1934; Bittrich 1993) of Caryo- (Bittrich 1993). The definition of monophyletic groups within phyllaceae includes three subfamilies based on characters of the family has been problematic because of difficulty in deter- the stipules, petals, sepals, and fruits: Alsinoideae Burnett mining phylogenetically useful characters and the possibility [Minuartioideae DC.], Caryophylloideae Arn., and Parony- of widespread convergence of characters used in formal classi- chioideae A. St. Hil. ex Fenzl [Illecebroideae Arn.].2 Rabeler fications, including embryogeny, leaf morphology, chromosome 1 Author for correspondence; current address: Department of Integrative Biology, University and Jepson Herbaria, 1001 Valley Life Sciences Building, University of California, Berkeley, California 94720- this paper are not the oldest available names. The correct names, 2465, U.S.A.; e-mail: [email protected]. following Reveal (2007), are as follows: Alsinoideae Burnett (1835) is 2 Review of the recently released work by Takhtajan (2009) revealed predated by Minuartioideae DC. in Beilschm. (1833), Paronychioideae that, unfortunately, three of the subfamily names used throughout A. St. Hil. ex Fenzl (1839) is predated by Illecebroideae Arn. (1832), and Polycarpoideae Burnett (1835) is predated by Polycarpaoideae Manuscript received August 2009; revised manuscript received October 2009. Beilschm. (1833). 185 186 INTERNATIONAL JOURNAL OF PLANT SCIENCES numbers, number of floral parts, and the presence and nature they represent an increase in chromosome number from the of nectaries. base number of n ¼ 9 for the family. Characters that have Possible morphological homoplasy and difficulty in de- been used to circumscribe subfamily Alsinoideae include exstip- termining morphological synapomorphies make the use of ulate leaves; perigynous or hypogynous flowers; often con- molecular phylogenetic data critical in understanding the rela- spicuous petals; free sepals; mostly open or semiclosed petal tionships within the Caryophyllaceae (Smissen et al. 2002; venation; epipetalous stamens, often with a nectar gland at Fior et al. 2006). Until recently, most of the molecular studies the base and mainly capsulate; and dehiscent fruit. As Bittrich that have included members of the Caryophyllaceae have been (1993) suggested, the circumscription of the Alsinoideae could focused on the relationships of the families within the order be less clear if genera (e.g. Polycarpon and Spergula L.) with Caryophyllales rather than on relationships within the family capsular fruits, which are most often regarded as members of (Rettig et al. 1992; Downie and Palmer 1994; Downie et al. the subfamily Paronychioideae, are included in the Alsinoi- 1997; Cue´noud et al. 2002); these studies have revealed that deae; Leonhardt (1951) did so in his seven-subfamily classifi- the family is monophyletic (Rettig et al. 1992; Downie and cation of the family. This lack of clarity could also occur when Palmer 1994; Downie et al. 1997; Fior et al. 2006), support- authors recognize a narrow sense of the Paronychioideae as ing the continued inclusion of members of the Paronychioi- the family Illecebraceae (Hutchinson 1973). These genera dif- deae. Many of the more focused studies have been on the tribe fer from the ‘‘core’’ Alsinoideae in characters of embryology, Sileneae DC., especially the genus Silene L. (Desfeux and leaf venation, and presence of stipules, suggesting that capsu- Lejeune 1996; Oxelman and Lide´n 1995; Oxelman et al. lar fruits may have arisen more than once in the Caryophylla- 1997, 2001; Eggens et al. 2007; Erixon and Oxelman 2008). ceae. Furthermore, the genus Geocarpon Mack. (Alsinoideae) In addition, a number of studies on genera within the Caryo- has tiny petals that could be interpreted as staminodes, a diag- phyllaceae have been completed (Schiedea Cham. & Schltdl.: nostic feature of some of the Paronychioideae (Bittrich 1993). Soltis et al. 1996; Scleranthus: Smissen et al. 2003; Schiedea: Relationships within subfamily Alsinoideae, the largest of the Wagner et al. 2005; Arenaria L. and Moehringia L.: Fior and Caryophyllaceae subfamilies, are poorly known. Bittrich (1993) Karis 2007; Polycarpon L.: Kool et al. 2007; Silene: Popp and placed the 28 genera of the Alsinoideae into five tribes, the Al- Oxelman 2001) and are beginning to provide an understand- sineae (23 genera), the Geocarpeae E.J. Palmer & Steyerm. ing of the complexities of the family. Finally, a recent study by (consisting of a single species, Geocarpon minimum Mack.), Brockington et al. (2009) has advanced our understanding of the the Habrosieae Endl. (consisting of a single species, Habrosia order Caryophyllales and the placement of the Caryophyllaceae. spinuliflora Fenzl), the Sclerantheae (two genera), and the Pyc- Relationships within the Caryophyllaceae and monophyly nophylleae Mattf. (consisting of the single genus Pycnophyl- of the subfamilies were first investigated with molecular data lum E.J. Remy; see also table 1). Characters of floral variation by Smissen et al. (2002), who produced a phylogeny of 15 (loculicidal vs. both loculicidal and septicidal dehiscence, car- genera based on the chloroplast ndhF gene. A more com- pel number, presence or absence of petals, and sepal character- prehensive study of 38 genera in the Caryophyllaceae was istics) have been used extensively in generic delimitation in the performed by Fior et al. (2006), using a combination of Alsinoideae. However, such characters are known to be highly chloroplast (matK) and nuclear ribosomal DNA (nrDNA; evolutionarily labile or plastic and may not represent ho- ITS) data. Both
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