Chaptalia hermogenis (Asteraceae: Mutisieae), a New Species from the Brazilian Atlantic Rain Forest Marta Dias de Moraes Departamento de Botanica, I.B., UNICAMP, Caixa Postal 6109, Campinas 13083-970, SP, BrazilABSTRACT. Chaptalia hermogenis (sect. Archi-chaptalia), currently known only from a montaneforest in the Atlantic Rain Forest region of south-eastern Brazil, is described and illustrated. Thenew species is compared with the closely similarC. cordifolia (Baker) Cabrera. It is distinguished bya long involucre, the long expanded limb with aninner linear lip of the female florets, the absenceof tubular-filiform internal female florets, a char-acter rare in the genus, and a sparsely pubescentachene. Chaptalia Ventenat comprises about 56 speciesdistributed from the southern United States tosouthern South America (Nesom, 1995), with atleast 12 species occurring in Brazil. Some Brazilianspecies have a wide distribution, while a few seemto be endemic to smaller areas, such as C. denti-culata (Baker) Zardini in the Atlantic Rain Forestof the state of Rio de Janeiro and C. graminifolia(Dustn) Cabrera in the states of Parana and SantaCatarina. The most useful taxonomic treatment ofthis genus is still the monograph by Burkart (1944).His seven sections were considered by Nesom(1995) to be probably natural. A group of speciesthat Burkart (1944) referred to Trichocline Cassini,although he found the species difficult to separatefrom Chaptalia sect. Archichaptalia Burkart, hassince then been transferred to Chaptalia. Tricho-cline cordifolia Baker, transferred to Chaptalia byCabrera (Cabrera & Klein, 1973), closely resem-bles the new species described here. Trichocline,distributed in South America, and Gerbera L., inAfrica and Asia, are generally accepted as closelyrelated to Chaptalia, but both differ from this genusby the presence of staminodes in the female florets,a difference accepted by Burkart (1944) but con-sidered as not completely satisfactory. Hansen(1990) concluded from his phylogenetic studies inthe Gerbera-complex (Chaptalia, Trichocline, Ger-bera, and four small genera (Leibnitzia Cassini, Lu-lia Zardini, Perdicium L., and Uechtritzia Freyn)),that this complex should be ranked as a single,large genus, but considered it premature to proposeany formal taxonomic changes. The cladogram pre-sented by Hansen (1990) is based only on 15 char-acters and some of these are polymorphic in histerminal taxa. For example, the character "scape"was considered bracteate in the genus Chaptalia,but the scape in the new species is ebracteate asit is in several Chaptalia species (e.g., C. integer-rima (Vellozo) Burkart, C. nutans (L.) Polak). Chap-talia hermogenis is included in section Archichap-talia based on its long-petiolate leaves and shortlydecurrent, broadly ovate blades. The inclusion ofthe new species enlarges the circumscription ofsection Archichaptalia, because C. hermogenis hasthe corolla of the inner female florets longer thanthe style. The new species has an ebracteate scape,while C. cordifolia has a scape without or with fewlinear bracts. In the other species of this sectionthe scape is described as bracteate with few tomany bracts, and as in C. cordifolia, the corolla ofthe inner female florets is described as being short-er than the style.Chaptalia hermogenis M. D. Moraes, sp. nov. TYPE: Brazil. Sao Paulo: Eldorado, Nicleo Caverna do Diabo, Parque Estadual de Jacu-piranga, on nearest hill on the E side of the headquarters, 24�38'41"S, 48�23'31"W, ca. 600 m alt., 5 Sep. 1996. M. D. Moraes & F A. R. D. P Arzolla 367 (holotype, UEC; iso-types, B, F, G, K, LP, M, MBM, MO, NY, R, RB, SP, UPS, W). Figure 1. Chaptalia hermogenis C. cordifoliam (Baker) Cabrerasimulat, sed differt scapo florifero semper ebracteato. fer-rugineo-villoso praecipue ad apicem: capitulo multifloro;involucro 15.7-21 mm longo; floribus marginalibus 16-30 feminineis ligulato-bilabiatis exsertis, limbo 11.5-13.6mm longo, 2-2.6 mm lato, 4-6-nervato, apice integro veltridentato, lobulo interno 2-laciniato, 1.7-7.3 mm longo.rare integro; floribus feminineis internis 11-43 floribusmarginalibus similibus sed centrum versus minoribus:flosculis femineis reductis nullis; floribus centralibus disci24-61 masculis, corollis bilabiatis 9.2-10.5 mm longis.limbo 3-denticulato. lobulis reflexis apice papilloso; ach-eniis pubescentibus. Perennial herb up to 20 cm high with a rosette NOVON 8: 173-175. 1998.
BioStor
