Büneker et al. 2015 (Conference Paper) Dyckia

Taxonomic study of Dyckia maritima complex (Bromeliaceae, Pitcairnioideae): preliminary results

Author(s):—H.M. Pontes Büneker & L. Witeck-Neto in Benko-Iseppon, A.M.; Alves, M. & Louzada, R. (2015) An overview and abstracts of the First World Congress on Bromeliaceae Evolution. Rodriguésia 66(2): A1-A66.

Publication:— (2015).

Abstract:—Endemic to the southern Brazilian states of Rio Grande do Sul and Santa Catarina, the informal group called ?complexDyckia maritima? was proposed by Strehl & Beheregaray (2006) based on a morphological study of Dyckia seeds. That study grouped species, different from the typical Dyckia complex that have narrow-ovate seeds (vs. wide-oval),not flat (vs. flat, discoid) and triangular (vs. semicircular or sickle). The first species published of complex wasDyckia maritima, originally proposed as a monospecific genus, Prionophyllum K. Koch (1874), and consists ofPrionophyllum selloum (= Dyckia selloa (K. Koch) Baker), this was widely accepted by Mez (1895, 1896, 1935),being diagnosed in these works mainly by dimorphic flowers (perfect or pistillate). This feature, rare in Bromeliaceae,was not subsequently observed in any other specimen of the complex. Baker, in the Handbook of the Bromeliaceae(1889), proposed a broader constituency for Dyckia and downgraded Prionophyllum to a subgenus of Dyckia and described Dyckia maritima, D. grandifolia, D. macracantha and D. myriostachya, species belonging to the complex.Smith (1943, 1956) and Smith & Downs (1974), in a review of the Bromeliaceae family, considered Prionophyllumas synonymous with Dyckia, which is still the most widely acceptedposition. Considering the few studies in relation to the Dyckia maritima complex today, in reason of the difficult taxonomic position and the specific delimitation oftaxa, a taxonomic revision is being performed, including observations and collections of species of the complex inits habitat, a literature review and consultations in herbaria. The studies, according to morphological observations,indicate the existence of a group of closely related species within the complex (Dyckia maritima complex sensu strictu)composed of D. maritima, D. myriostachya (species considered by Mez (1935), Smith (1943, 1956) and Smith &Downs (1974) as synonymous with Dyckia selloa, but here considered species), D. retroflexa, D. nigrospinulata and D. rigida. In these species it was found that other species are also within the D. maritima complex sensu lato, or fitunder the characteristics mentioned above: D. agudensis, D. alba, D. delicata, D. domfelicianensis, D. hebdingii, D. polycladus, D. selloa, D. tomentosa (species considered by Mez (1935), Smith (1943, 1956) and Smith & Downs (1974) as synonymous with D. martima, here considered species). The Dyckia retardata species was considered asynonym of D. tomentosa. Phylogenetic analyzes presented by Krapp (2013), based on nuclear DNA gene sequencedata phyC, suggests the monophyly of the Dyckia maritima complex, so in order to verify the monophyly of the group(with the highest number of species in this analysis) and better understand the interspecific relationships within thegroup, studies using molecular characters will be developed in future by our research group.

Keywords:—Taxonomy; Austro-brasilica Flora; Prionophyllum.