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Hoya rotundiflora (Apocynaceae, Asclepiadoideae), a new horticulturally important species from Myanmar
No full textRodda, Michele, Simonsson, Nadhanielle (2011): Hoya rotundiflora (Apocynaceae, Asclepiadoideae), a new horticulturally important species from Myanmar. Phytotaxa 27: 37-43, DOI: 10.11646/phytotaxa.27.1.4, URL: http://biotaxa.org/Phytotaxa/article/view/phytotaxa.27.1.
FIGURE 1 in Hoya rotundiflora (Apocynaceae, Asclepiadoideae), a new horticulturally important species from Myanmar
No full textFIGURE 1. Drawings prepared from the holotype of Hoya rotundiflora: a. flower (above); b. flower (side); c. corona (underneath); d. calyx. Drawn by M. Rodda.Published as part of Rodda, Michele & Simonsson, Nadhanielle, 2011, Hoya rotundiflora (Apocynaceae, Asclepiadoideae), a new horticulturally important species from Myanmar, pp. 37-43 in Phytotaxa 27 on page 38, DOI: 10.11646/phytotaxa.27.1.4, http://zenodo.org/record/489418
Hoya rotundiflora Rodda & Simonsson 2011, sp. nov.
No full text<i>Hoya rotundiflora</i> Rodda & Simonsson, <i>sp. nov.</i> (Figs. 1–3) <p> <i>Habitum ad Hoyam lyi et Hoyam thomsonii accedit sed corolla revoluta, corona lobis erectiores et folia margine revolutis recedit.</i></p> <p> <b>Type</b>:— Ex hort. Sweden, Stockholm, 1 September 2009, <i>Torill Nyhuus 2009.1</i> (holotype K).</p> <p>Pendulous to weakly climbing vine with white latex in all parts. Stems pendulous to weakly twining, cylindrical, ca. 3 mm in diameter, pilose; older stems lignified, glabrous; internodes 2–10 cm long with inactive adventitious roots 1–2 mm long located 0–2 mm below each petiole. Leaves (Fig. 2) opposite, petiolate; petiole 3–10 × 1–2 mm, pilose; lamina oblong-pandurate, 3–5 × 1.5–2.5 cm, widest point 1/8–1/5 length from the apex, fleshy coriaceous, adaxial surface dark green, abaxial surface light green with a distinctive darker margin 2–3 mm wide around the edge (Fig. 2e), abaxial surface glabrous, adaxial surface hirsute, apex round, base round or obtuse, margin slightly revolute on the lateral sides and apex only, ciliate; midrib clearly visible on both abaxial and adaxial surface, secondary veins 4 to 6 each side, less conspicuous, branching from the midrib at a wide acute or an almost right angle. Inflorescences (Fig. 3) one per node, interpetiolar, positively geotropic, umbelliform, convex, with up to 20 flowers, persistent; peduncle 5–35(–70) × 1.5–3.0 mm, pilose, pedicels filiform, 17–20 × 1.0– 1.5 mm, glabrous. Flower buds globular, white. Flowers weakly sweetly scented (lasting about one week in cultivation), from the base of the corolla lobes to the inner apex of the corona 7–10 mm long, corolla 9–12 mm in diam. Sepals (Fig. 1d) ovate, ca. 2.5 × 1.0 mm, apex round, alternating with single glands, glabrous, a few long hairs at the junction between the sepals and the pedicel. Corolla revolute, white; lobes lanceolate, 9–11 mm long, acute at apex; free portion of lobes 7–8 × 4.5–5.5 mm, distance between each sinus 3.5–4.0 mm, abaxially glabrous, hirsute adaxially, hairs up to 0.3 mm long, lobe apex (ca. 1 mm long) glabrous, margins ciliate. Corona staminal (Fig. 1a,b,c) fleshy, dull white to light yellow, laterally spreading, ca. 3 mm high, 6.5–7.5 mm in diameter; corona lobes held at 30–40 degrees to the filament tube, outer process rounded to obtuse, flattened, only partially folded beneath (Fig. 1c), inner process acute, held at about the same height as the anther appendages. Distance between center and outer corona process 3.3–3.6 mm; distance from center to corona sinus 1.5–1.8 mm; beneath corona, distance between filament tube and anther skirt (beneath guide rail) 0.6–0.8 mm. Pollinaria erect, ca. 830 × 430 µm; pollinia elongated, compressed, 660 × 220 µm, with a lateral pellucid margin; retinaculum 260 × 160 µm; translator 70–100 µm long. Ovary lanceolate, about 1.7 mm long, light green. Fruits and seeds not seen. All measurements from fresh type material.</p> <p> <b>Phenology:</b> — <i>Hoya rotundiflora</i> is commonly seen flowering in cultivation during the summer months, which is consistent with the flowering periods of plants from a monsoonal area such as south Myanmar. A similar flowering season has been observed for <i>Hoya pandurata</i> Tsiang (1939: 125) and <i>H. chinghungensis</i> (Tsiang & P.T.Li) Gilbert <i>et al.</i> (1995: 9) both originating from this geographical area (personal observations).</p> <p> <b>Habitat and distribution:</b> —Little is known about the original habitat of this species. It has been observed to be difficult to grow and flower in constantly warm areas such as Bangkok (S. Somadee, personal communication) and therefore it is likely to inhabit higher elevated areas where winter temperatures are lower and where there is a greater disparity between day and night temperatures.</p> <p>The type plant can be traced back to a market in Sangklaburi in Kanchanaburi province, Thailand, where it was first found in 2005. The plant was collected near the border in neighboring Myanmar but the exact locality has been kept secret by the seller.</p> <p> <b>IUCN Red List category:</b> —Population size and distribution range of <i>Hoya rotundiflora</i> cannot be estimated, as it is so far known from only a single collection. Due to the high horticultural interest in <i>Hoya</i> it is surprising that no further collections belonging to this taxon have been made since its first introduction into cultivation in 2007. This may suggest that the species may have a very restricted distribution range and small population size containing a limited number of mature individuals or its habitat may be inaccessible, for example being on steep karst formations. Further, <i>Hoya</i> populations are often under pressure because of frequent collection to supply the horticultural trade and therefore <i>H. rotundiflora</i> is hereby suggested as vulnerable according to IUCN Red List criteria (IUCN 2001).</p> <p> <b>Additional specimen examined:</b> — <i>Ex Hort.</i>, 15 June 2010, <i>Rodda Hort 2010/1</i> (L, SING, TO).</p>Published as part of <i>Rodda, Michele & Simonsson, Nadhanielle, 2011, Hoya rotundiflora (Apocynaceae, Asclepiadoideae), a new horticulturally important species from Myanmar, pp. 37-43 in Phytotaxa 27</i> on pages 37-41, DOI: 10.11646/phytotaxa.27.1.4, <a href="http://zenodo.org/record/4894182">http://zenodo.org/record/4894182</a>
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
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koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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