76 research outputs found
Smithsonian Plant Collections, Guiana Shield: 2002-2012, Karen M. Redden and Kenneth J. Wurdack
No full textSmithsonian Plant Collections, Guiana Shield: 2002–2012, Karen M. Redden and Kenneth J. Wurdack. Part I provides the collector’s notes on trips with maps by date. Part II lists collection localities, with collection number ranges, habitat descriptions, geographic coordinates, and assisting collectors. Part III lists collections in numerical order with identifications and authors. Part IV lists collections ordered by determined name.</p
Figure 3 from: Wurdack KJ (2017) A new disjunct Dendrothrix (Euphorbiaceae, tribe Hippomaneae): a Guiana Shield element in sub-Andean cordilleras of Ecuador and Peru. PhytoKeys 86: 117-130. https://doi.org/10.3897/phytokeys.86.14761
No full textFigure 3 -
Seeds and surfaces of Dendrothrix. A–D Ventral views of seeds (ca = caruncle) A D. yutajensis B D. condorensis C D. multiglandulosa D D. wurdackii E D. condorensis, inflorescence axis showing dendritic trichomes F D. condorensis, top of seed showing short funicle (f) and caruncle absence G Abaxial view of D. condorensis leaf H D. condorensis transverse fractured leaf showing abaxial papillae and stomata (st), above intercellular space in the spongy parenchyma (m = mesophyll) I D. condorensis abaxial leaf micropapillae contrasting with smooth revolute adaxial leaf margin at image top J Adaxial view of D. yutajensis leaf K D. wurdackii, abaxial leaf surface along secondary vein showing gradient of micropapillae development at vein edges, and overlying dendritic trichomes. (A–D, F–G, J imaged with a Olympus DSX100 E, H–I, K imaged with a Zeiss EVO MA15 SEM at 10–12 kV after sputter coating with 25 nm of Au/Pd; SEM samples untreated and directly mounted from dried herbarium specimens. Source: A Nee 31120, NY; B, F Neill et al. 15750, MO; C Maguire & Politi 27683, NY; D Calderón et al. 2682, US; E, G–I Neill & Quizhpe 14939, MO; J Amaral 1523, MO; K Cid Ferreira 5797, NY)
A new, disjunct species of Bahiana (Euphorbiaceae-Acalyphoideae): Phytogeographic connections between the seasonally dry tropical forests of Peru and Brazil, and a review of spinescence in the family
No full textBahiana is expanded from 1 to 2 species with the description of B. occidentalis K. Wurdack, sp. nov. as a new endemic of the seasonally dry tropical forests (SDTFs) of Peru. The disjunct distribution of Bahiana with populations of B. occidentalis on opposite sides of the Andes in northwestern Peru (Tumbes, San Martín) and B. pyriformis in eastern Brazil (Bahia) adds to the phytogeographic links among the widely scattered New World SDTFs. Although B. occidentalis remains imperfectly known due to lack of flowering collections, molecular phylogenetic results from four loci (plastid matK, rbcL, and trnL-F; and nuclear ITS) unite the two species as does gross vegetative morphology, notably their spinose stipules, and androecial structure. Spinescence in Euphorbiaceae was surveyed and found on vegetative organs in 25 genera, which mostly have modified sharp branch tips. Among New World taxa, spines that originate from stipule modifications only occur in Bahiana and Acidocroton, while the intrastipular spines of Philyra are of uncertain homologies.Data files are text documents that can be opened in any text editor. Commands are designed to be executed in PAUP*, and matrix derivatives then analyzed with other phylogenetic analysis programs.Funding provided by: Smithsonian InstitutionCrossref Funder Registry ID: http://dx.doi.org/10.13039/100000014Award Number:Datasets derive from fluorescent Sanger sequencing on an ABI 3730xl DNA Analyzer. The reads were assembled with Sequencher v5.2.4 and consensus sequences were manually inserted into the multiple sequence alignments (MSAs) of Carrión et al. (2022), followed by alignment refinements based on a sequence similarity criterion
Figure 2 from: Wurdack KJ (2017) A new tiny-leaved species of Raveniopsis (Rutaceae) from the Pakaraima Mountains of Guyana. PhytoKeys 91: 1-12. https://doi.org/10.3897/phytokeys.91.14763
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Morphology and anatomy of Raveniopsis microphyllus. A Life photo of flowering branch showing strongly zygomorphic, white corolla B Pollen with mesocolpium-centered equatorial view of whole grain C Transverse section of leaflet edge under polarized light, showing bright styloid crystal (at arrow) D In-situ styloid crystals near secondary vein E Transverse section of entire leaflet (tiled image) F Transverse section in closer view showing thick adaxial cuticle, and abaxial trichome with multicelled stalk G Adaxial epidermis showing thick cuticle above epidermal cells. (Source: Tripp 3191, US)
Figure 1 from: Wurdack KJ (2017) A new tiny-leaved species of Raveniopsis (Rutaceae) from the Pakaraima Mountains of Guyana. PhytoKeys 91: 1-12. https://doi.org/10.3897/phytokeys.91.14763
No full textFigure 1 from: Wurdack KJ (2017) A new disjunct Dendrothrix (Euphorbiaceae, tribe Hippomaneae): a Guiana Shield element in sub-Andean cordilleras of Ecuador and Peru. PhytoKeys 86: 117-130. https://doi.org/10.3897/phytokeys.86.14761
No full textFigure 2 from: Wurdack KJ (2017) A new disjunct Dendrothrix (Euphorbiaceae, tribe Hippomaneae): a Guiana Shield element in sub-Andean cordilleras of Ecuador and Peru. PhytoKeys 86: 117-130. https://doi.org/10.3897/phytokeys.86.14761
No full textFigure 3 from: Wurdack KJ (2017) A new tiny-leaved species of Raveniopsis (Rutaceae) from the Pakaraima Mountains of Guyana. PhytoKeys 91: 1-12. https://doi.org/10.3897/phytokeys.91.14763
No full textFigure 4 from: Wurdack KJ (2017) A new disjunct Dendrothrix (Euphorbiaceae, tribe Hippomaneae): a Guiana Shield element in sub-Andean cordilleras of Ecuador and Peru. PhytoKeys 86: 117-130. https://doi.org/10.3897/phytokeys.86.14761
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