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A Preliminary Phylogeny of Loasaceae Subfam. Loasoideae

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CORE Metadata, citation and similar papers at core.ac.uk Provided by Elsevier - Publisher Connector ARTICLE IN PRESS Organisms, Diversity & Evolution 4 (2004) 73–90 www.elsevier.de/ode A preliminary phylogeny of Loasaceae subfam. Loasoideae (Angiosper- mae: Cornales) based on trnL(UAA) sequence data, with consequences for systematics and historical biogeography Maximilian Weigenda,*, Marc Gottschlinga,b, Sara Hootc, Markus Ackermanna a Institut fur. Biologie, Systematische Botanik und Pflanzengeographie, Freie Universitat. Berlin, Altensteinstr. 6, D-14195 Berlin, Germany b Fachbereich Geologische Wissenschaften, Fachrichtung Palaontologie,. Malteser Strasse 74-100, D-12149 Berlin, Germany c Department of Biological Sciences, Lapham Hall, P. O. Box 413, University of Wisconsin, Milwaukee, Milwaukee, WI 53201, USA Received5 May 2003; accepted11 December 2003 Abstract The phylogeny of Loasaceae subfam. Loasoideae is investigated with sequences of the chloroplast trnL(UAA) intron, all genera and infrageneric entities are included in the analysis. Loasaceae subfam. Loasoideae is monophyletic, and the two most speciose, andmonophyletic, clades(which account for approximately 90% of the species total) are Nasa andthe so-calledSouthern AndeanLoasas ( Blumenbachia, Caiophora, Loasa s.str., Scyphanthus), but the phylogeny of the remainder is not completely resolved. The data underscore a basal position for Chichicaste, Huidobria, Kissenia, andKlaprothieae ( Xylopodia, Klaprothia, Plakothira). High bootstrap support values confirm the monophyly both of Klaprothieae and Presliophytum (when expanded to include Loasa ser. Malesherbioideae). Aosa and Blumenbachia are not resolvedas monophyletic, but have clear morphological apomorphies. Within Nasa,‘‘N. ser. Saccatae’’ is paraphyletic, and‘‘ N. ser. Carunculatae’’ is polyphyletic. However, the N. triphylla group in ‘‘N. ser. Saccatae’’ is a well-supportedmonophyletic group, as is N. ser. Grandiflorae.‘‘Loasa’’ in its traditional circumscription is paraphyletic, but Loasa s.str. (L. ser. Macrospermae, L. ser. Deserticolae, L. ser. Floribundae) is monophyletic. The remainder of ‘‘Loasa’’ (L. ser. Pinnatae, L. ser. Acaules, L. ser. Volubiles) is probably closely alliedto the essentially Patagonian-High Andean group comprising also Scyphanthus and Caiophora. These findings are congruent with morphology andphytogeography. Nasa seems to have undergone its primary radiation at moderate elevations (1500– 2500 m) in the Andes of northern Peru (Amotape-Huancabamba Zone) and subsequently diversified into high elevations (above 4000 m) of the tropical Central Andes. South Andean Loasas appear to have undergone their primary diversification in the southern temperate and mediterranean regions of Chile and Argentina, with a subsequent northwards expansion of Caiophora into the high elevations of the tropical Andes. Hummingbird pollination has evolved independently from melittophily in High Andean clades of Nasa and Caiophora. r 2004 Elsevier GmbH. All rights reserved. Keywords: Loasaceae; High Andean clades; Floral morphology; Molecular systematics; Nasa; South Andean Loasas Introduction Loasaceae are medium-sized (ca. 300 spp.) and largely *Corresponding author. Tel.: +49-30-838-565-11. Neotropical plant family whose precise relationships E-mail address: [email protected] (M. Weigend). among angiosperms have been controversially discussed. 1439-6092/$ - see front matter r 2004 Elsevier GmbH. All rights reserved. doi:10.1016/j.ode.2003.12.001 ARTICLE IN PRESS 74 M. Weigendet al. / Organisms, Diversity & Evolution 4 (2004) 73–90 The last few years have brought enormous progress in subgenus in ‘‘Loasa’’, was re-instatedat genus rank this field, and the Loasaceae have been shown to be (Grau 1997). However, because no detailed new studies closely alliedto Hydrangeaceae andfirmly nestedin are available, the treatments of Urban andGilg (1900) Cornales (Hempel et al. 1995; Moody and Hufford have been largely followed, and only Schismocarpus 2000). Morphological studies confirm this placement, Blake (subfam. Mentzelioideae) from southern Mexico andthe similarity between some groups in Loasaceae and Plakothira Florence (subfam. Loasoideae, tribe andsome groups in Hydrangeaceae (e.g. Deutzia Klaprothieae) from the Marquesas Islands in Polynesia Thunb., Jamesia Torr. & Gray, and Philadelphus L.) is have been described since the ‘‘Monographia Loasa- indeed striking in varied character complexes such cearum’’. as seedmorphology, flower morphology, indument Weigend(1997) made an attempt to arrive at a more morphology, phytochemistry, andleaf morphology natural classification of Loasaceae subfam. Loasoideae (Weigend, 2004). (Table 1) considering a wide range of morphological The subdivision of Loasaceae has also been con- traits andcharacter polarity. This studyledto the troversially discussed (Davis andThompson 1967 ; segregation from ‘‘Loasa’’ of a total of four genera: Poston andThompson 1977 ; Weigend1997 ; Moody 1. Nasa Weigend(short for ‘‘North AndeanLoasas’’; andHufford2000 ). The mainly North American Urban andGilg’s groups Loasa ser. Grandiflorae, subfamilies Gronovioideae (Cevallia Lag., Fuertesia L. ser. Saccatae, L. ser. Carunculatae, L. ser. Alatae), Urb., Gronovia L.), Mentzelioideae (Eucnide Zucch., for by now approx. 100 spp. mainly from the Mentzelia L., Schismocarpus Blake), andPetalonychoi- northern andcentral Andes; deae (Petalonyx A.Gray) have been extensively studied, 2. Aosa Weigend, for the Brazilian and Hispaniolan but these make up only about 1/3 of the family’s species representatives of ‘‘Loasa’’ (Urban andGilg’s groups total. The subfamily that is by far the largest (over 200 L. ser. Corymbosae, L. ser. Parviflorae, L. ser. spp.) andmost diverse(morphologically, ecologically, Pusillae); andphytochemically), the Loasoideae,has been the 3. Presliophytum (Urban andGilg) Weigend(Urban & subject of very few detailed studies, and these have Gilg’s Loasa subg. Presliophytum); usually been limitedto the few commonly cultivated 4. Chichicaste Weigend, for Loasa grandis Standl. representatives, such as Blumenbachia insignis Schrad., (described after Urban & Gilg’s studies). B. hieronymi Urb., Caiophora lateritia Klotzsch, and Nasa triphylla (Juss.) Weigendsubsp. triphylla. Another systematic addition was the description of Until recently, the only comprehensive study available Xylopodia Weigendbelonging to the Klaprothieae was the ‘‘Monographia Loasacearum’’ (Urban andGilg (discovered in northern Peru in 1997), and Caiophora 1900) which was basednearly exclusively on herbarium was redefined by removing the two sections Angulatae material much of which was very poorly preserved. This and Gripidea to Blumenbachia (Weigend1997 ). study recognized a total of seven genera in Loasoideae The Loaseae were informally segregatedinto two (Blumenbachia Schrad., Caiophora C.Presl, Kissenia ‘‘grades’’: ‘‘Lower Loaseae’’, with a number of small Endl., Klaprothia Kunth, Loasa Adans., Sclerothrix genera characterizedby relatively simple andupright C.Presl, Scyphanthus D.Don), with ‘‘Loasa’’ accounting flowers without thigmonastic stamens (Chichicaste, for more than half of the species (83 of 153). The genera Huidobria, Presliophytum); andHigher Loaseae, com- were groupedinto three tribes, Kissenieae ( Kissenia;2 prising genera with more complex andusually pendu- spp.), Klaprothieae (Klaprothia, Sclerothrix; 2 spp.), and lous flowers with thigmonastic stamens (Aosa, Loaseae (Blumenbachia, Caiophora,‘‘Loasa’’, Scy- Blumenbachia, Caiophora,‘‘Loasa’’, Nasa, Scyphanthus). phanthus; 149 spp.). ‘‘Loasa’’ was circumscribedexclu- The Higher Loaseae divide into three clearly mono- sively by the presence of fruits opening with apical phyletic assemblages: Aosa, Nasa, anda complex valves, a truly plesiomorphic character also foundin informally calledSouth AndeanLoasas comprising Mentzelioideae and outside of Loasaceae in the putative Blumenbachia, Caiophora,‘‘Loasa’’, and Scyphanthus. sistergroup Hydrangeaceae. Urban andGilg (1900) Currently, South Andean Loasas remain largely un- wrote detailed studies on many aspects of morphology resolved, since they show reticulate patterns of variation andstudiedLoasaceae with enormous accuracy, but in in many characters and have not been studied in detail. their subsequent classification they made little use of the Caiophora has recently been subdivided into species numerous characters observed. groups to make the large genus more manageable At species level, their decisions have been widely (WeigendandAckermann 2003 ). ‘‘Loasa’’ still contains criticizedas being too narrow ( Darlington 1934; one highly divergent entity, L. ser. Malesherbioideae Sleumer 1956), andthe generic concepts have also been (Table 1), which lacks the derived characters of Loasa challenged: Sclerothrix was reduced to synonymy under s.str. andrather appears to be closely alliedto Klaprothia (Poston andNowicke 1990 ), and Huidobria Presliophytum. It is here treatedseparately (both species Gay, which Urban andGilg (1900) hadtreatedas a of L. ser. Malesherbioideae were available for analysis). Table 1. Synopsis of the classification of Loasaceae subfamily Loasoideae, modified from Weigend(1997) . Loasaceae subfam. Loasoideae Genus Infrageneric entity Acronym Species total Species studied Distribution Tribe Klaprothieae Klaprothia — 2 2 C & S America Plakothira — 3 1 Marquesas Islands Xylopodia — 1 1 N Peru Tribe Loaseae, Kissenia — 2 1 Africa ‘‘Lower Loaseae’’ Chichicaste — 1 1 Panama & Costa Rica Huidobria — 2 2 N Chile
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