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Full Article Selbyana 25(2): 225±238. 2005. REORGANIZATION OF TRIBAL AND GENERIC BOUNDARIES IN THE GLOXINIEAE (GESNERIACEAE:GESNERIOIDEAE) AND THE DESCRIPTION OF A NEW TRIBE IN THE GESNERIOIDEAE, SPHAERORRHIZEAE ERIC H. ROALSON* School of Biological Sciences and Center for Integrated Biotechnology, Washington State University, Pullman, WA 99164-4236 USA. Email: [email protected] JOHN K. BOGGAN AND LAURENCE E. SKOG National Museum of Natural History, Department of Botany, Smithsonian Institution, Washington, DC 20013-7012 USA. ABSTRACT. Morphological and molecular studies in tribe Gloxinieae have led to the need to describe four new genera and one new tribe, with two historically recognized genera resurrected and three currently recognized genera submerged into other generic concepts. The new genera Gloxinella, Gloxiniopsis, Nom- opyle, and Sphaerorrhiza include species previously treated in Gloxinia. The genus Sphaerorrhiza also is treated as a new tribe because of its distant phylogenetic relationship to the Gloxinieae. Mandirola and Seemannia have been resurrected to de®ne monophyletic groups of species previously treated in Gloxinia. The genera Anodiscus and Koellikeria have been submerged into the new circumscription of Gloxinia to re¯ect phylogenetic relationships and morphological similarities among the species of these genera. The circumscription of Kohleria is here broadened to include Capanea. In all, seven generic transfers of already available names are made as well as 11 new combinations: Gloxinella lindeniana, Gloxinia erinoides, G. xanthophylla, Gloxiniopsis racemosa, Kohleria af®nis, K. tigridia, Mandirola rupestris, Nomopyle dodsonii, N. peruviana, Sphaerorrhiza sarmentiana, and S. burchellii. Key words: Gesneriaceae, Gesnerioideae, Gloxinieae, Sphaerorrhizeae INTRODUCTION current generic placement of a taxon is clearly wrong, but there is not reasonable support for its Recent studies of phylogenetic relationships placement in the generic concepts presented in Gesneriaceae subfamily Gesnerioideae (Zim- here, we have dealt with the taxon as incertae mer et al. 2002) and tribe Gloxinieae (Roalson sedis. Further work will be necessary to deter- et al. 2003, Smith et al. 2004, Roalson et al. mine the placement of these taxa. The problems 2005, E. Roalson et al. unpubl. data) have sug- associated with delimitation and polyphyly of gested that tribal and generic boundaries in these Phinaea (Smith et al. 2004, Roalson et al. 2005) groups require extensive reorganization. This will be addressed in a separate publication (J. paper begins the process of reorganizing generic Boggan et al. unpubl. data). Finally, some taxa boundaries in tribe Gloxinieae, reinstating old previously placed in the Gloxinieae, but for generic concepts for some groups, and creating which there is now good evidence that they be- new generic names where necessary. A charac- long elsewhere, are discussed and their classi®- terization of the phylogenetic relationships of cation position is clari®ed. Among the most sig- genera (as circumscribed here) within the Glox- ni®cant results of these studies are that Gloxinia inieae is presented in FIGURE 1. The currently sensu Wiehler (1976, 1983) is a polyphyletic as- accepted species for all genera of the tribe are semblage that requires considerable reorganiza- enumerated below; complete synonymies for the tion, and that Gloxinia sarmentiana should not species are listed by Skog and Boggan (2005). only be excluded from the genus Gloxinia but The placement of some species is tentative, as from tribe Gloxinieae. A key to genera of the they have not been sampled in previous molec- recircumscribed Gloxinieae and a key to Ges- ular phylogenetic studies. The species that have nerioideae tribes with inferior or half-inferior been sampled in these phylogenetic studies are ovaries are presented. denoted with an asterisk (*) in the species lists below. Where species identity is unclear or the GLOXINIEAE FRITSCH Achimenes C.H.Persoon, Syn. Pl. 2: 165. 1807 * Corresponding author. [Nov 1806], nom. cons. against Achimenes 225 226SELBYANA Volume 25(2) 2005 data), although currently we cannot exclude the possibility that Achimenes is monophyletic (E. Roalson et al. unpubl. data). Achimenes as cur- rently circumscribed is morphologically hetero- geneous, and if eventually shown to be paraphy- letic with regard to Solenophora, it may be nec- essary to resurrect the genera Dicyrta Regel and Plectopoma Hanstein to include those species of Achimenes that may be more closely related to Solenophora. If this is the case, Dicyrta would likely include Achimenes brevifolia, A. obscura, and A. misera, and Plectopoma would include A. glabrata, as Plectopoma ®mbriatum (W.J. Hooker) Hanstein. Further study of phylogenetic relationships will be needed to assess whether these generic recircumscriptions are necessary. Diastema G.Bentham, Bot. Voy. Sulphur 132. 1844 [14 Apr 1845]. TYPE SPECIES: Diaste- ma racemiferum G.Bentham. The genus includes *Diastema af®ne Fritsch, FIGURE 1. Hypothesis of phylogenetic relation- ships among genera based on the studies of Roalson *D. comiferum (DC.) G.Bentham ex Walpers, D. et al. (2005) and E. Roalson et al. (unpubl. data). eggersianum Fritsch, D. gymnoleuca Gilli, D. hispidum (DC.) Fritsch, D. kalbreyeri Fritsch, D. lati¯orum Rusby, D. lehmannii Regel, D. ma- P.Browne 1756, and Vahl 1791 (Scrophul.). culatum (Poeppig) G.Bentham ex Walpers, D. micranthum J.D.Smith, D. purpurascens Rusby, TYPE SPECIES: Achimenes coccinea (Scopo- li) C.H.Persoon (5A. erecta (Lam.) D. quinquevulnerum J.E.Planchon & Linden, H.P.Fuchs). *D. racemiferum G.Bentham, D. rupestre Bran- degee, *D. scabrum (Poeppig) G.Bentham ex The genus includes *Achimenes admirabilis Walpers, D. sodiroanum Fritsch, D. tenerrimum Wiehler, *A. antirrhina (DC.) C.V.Morton, A. (Poeppig) G.Bentham ex Walpers, D. urticifol- brevifolia C.V.Morton, *A. candida Lindley, *A. ium (Poeppig) G.Bentham ex Walpers, D. vex- cettoana H.E.Moore, *A. dulcis C.V.Morton, *A. ans H.E.Moore, D. weberbaueri Fritsch, and D. erecta (Lamarck) H.P.Fuchs, *A. ®mbriata Rose williamsii Rusby. ex C.V.Morton, *A. ¯ava C.V.Morton, *A. gla- Although badly in need of revision, Diastema, brata (Zuccarini) Fritsch, *A. grandi¯ora as a genus, is morphologically well de®ned; and (Schiede) DC., *A. heterophylla (C.F.P.Martius) there is little doubt about its generic boundaries DC., *A. hintoniana A.RamõÂrez-Roa & (but see below). Among its key characters are a L.E.Skog, *A. longi¯ora DC., *A. mexicana racemose ¯owering axis consisting of solitary (B.C.Seemann) G.Bentham & J.D.Hooker ex ¯owers in the axils of bracts on stems with (usu- Fritsch, *A. misera Lindley, *A. nayaritensis ally) condensed internodes; a nectary consisting L.E.Skog, A. obscura C.V.Morton, *A. occiden- of 5 long, ®nger-like glands; and a distinctive talis C.V.Morton, *A. patens G.Bentham, *A. bilabiate stigma. In addition, most (but not all) pedunculata G.Bentham, A. saxicola (Brande- species have small white ¯owers with a single gee) C.V.Morton, A. skinneri Lindley, *A. war- purple blotch on each lobe. All of these are char- szewicziana (Regel) H.E.Moore, and *A. woodii acters not found in other taxa of Gloxinieae, in- C.V.Morton. cluding Gloxinella, which is the probable sister- Achimenes has undergone reorganization sev- taxon of Diastema. eral times in the last 30 years (particularly Wieh- Although collections usually can be assigned ler 1976, RamõÂrez-Roa 1987). Molecular phy- easily to this genus, assigning them to a species logenetic tools recently have been used to ex- is more problematic. Forty-six names have been plore phylogenetic relationships and ¯oral evo- described in Diastema, but it is unclear how lution in the genus (Roalson et al. 2003). There many species should be recognized; several spe- appear to be three or four major lineages of cies are known only from their type collections Achimenes (Roalson et al. 2003, E. Roalson et and should probably be synonymized under oth- al. unpubl. data), and the genus may not be er species, whereas the circumscriptions of some monophyletic, with Solenophora possibly nested of the more common and widespread species within Achimenes (E. Roalson et al. unpubl. (e.g., D. racemiferum) may be overly broad. ROALSON ET AL.: GLOXINIEAE GENERIC REORGANIZATION 227 Diastema vexans H.E.Moore poses a particu- Gloxinella lindeniana (Regel) E.H.Roalson & lar problem. Although agreeing with other spe- J.K.Boggan, comb. nov. Basionym: Tydaea cies of Diastema in several characters (nectary lindeniana Regel, Garten¯ora 17: 257, pl. con®guration, stigma type, fruit type, and a 589. 1868. Synonyms: Gloxinia lindeniana small white ¯ower with a purple blotch on each (Regel) Fritsch, Oesterr. Bot. Zeit. 63: 66. lobe), D. vexans differs in its in¯orescence 1913. Kohleria lindeniana (Regel) H.E. structure (1±4 ¯owered, usually bracteolate, Moore, Gentes Herb. 8: 380. 1954. TYPE: pair-¯owered cymes in the axils of foliar leaves). Regel, s.n. (LE, not seen). Phylogenetic studies (Roalson et al. 2005) show D. vexans to belong to a clade including Koh- Tydaea lindeniana Regel has been shuttled leria and Pearcea rather than the clade with all among several genera in its taxonomic history, other Diastema. In this case, the discrepancy be- suggesting that it ®ts well into none of them. tween morphology and phylogeny is especially Placed in Gloxinia by Fritsch (1913), it was later striking, and D. vexans and its relationship to the transferred to Kohleria by Moore (1954), who rest of the genus
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