1,720,958 research outputs found
Aristolochia gurinderii (Aristolochiaceae): a new species from Great Nicobar Island, India
No full textRavikumar, K., Tiwari, Umeshkumar, Balachandran, N. (2014): Aristolochia gurinderii (Aristolochiaceae): a new species from Great Nicobar Island, India. Phytotaxa 172 (2): 117-122, DOI: 10.11646/phytotaxa.172.2.7, URL: http://dx.doi.org/10.11646/phytotaxa.172.2.
A new variety of Bauhinia bassacensis (Leguminosae: Caesalpinioideae) from Great Nicobar Island, India
No full textTiwari, Umeshkumar, Ravikumar, Kaliamoorthy, Balachandran, Natesan (2013): A new variety of Bauhinia bassacensis (Leguminosae: Caesalpinioideae) from Great Nicobar Island, India. Phytotaxa 149 (1): 12-18, DOI: 10.11646/phytotaxa.149.1.2, URL: http://dx.doi.org/10.11646/phytotaxa.149.1.
FIGURE 2. Aristolochia gurinderii K in Aristolochia gurinderii (Aristolochiaceae): a new species from Great Nicobar Island, India
No full textFIGURE 2. Aristolochia gurinderii K. Ravikumar, Umeshkumar Tiwari and N. Balachandran, sp. nov.: A. Leaf with fruit; B. Inflorescence; C. Flower patterns; D. Close up of Flower; E. Dry Fruits and F. Green Fruit (Type: FRLH).Published as part of Ravikumar, K., Tiwari, Umeshkumar & Balachandran, N., 2014, Aristolochia gurinderii (Aristolochiaceae): a new species from Great Nicobar Island, India, pp. 117-122 in Phytotaxa 172 (2) on page 120, DOI: 10.11646/phytotaxa.172.2.7, http://zenodo.org/record/514244
Impatiens jurpia var. ravikumareana Tiwari, U. L. 2022, var. nov.
No full textImpatiens jurpia var. ravikumareana Tiwari, U.L. var. nov. (Fig. 1 & 2) Type:— INDIA. Arunachal Pradesh: East Kameng District, on way to Sangchu sollung basti from Chiyang Tajo, 27˚41̍̍05.6̎N, 92˚09̍05.2̎E, 1524m, 29 September 2017, Umeshkumar L. Tiwari 47801 (holotype: ARUN!, isotype: CAL!). Diagnosis: Impatiens jurpia var. ravikumareana has stem unbranched or rarely branch, young part white tomentose, not swollen nodes; inflorescence monochasial cyme, peduncle hairy at base and glabrous above; flowers yellow flushed with red; lateral sepal 2 mm long; lower sepal spur straight and twisted upward, reddish yellow, apex bifurcate (differ from Impatiens jurpia var. jurpia (1859: 140) has unbranched stem, young branch glabrous, nodes swollen; inflorescence pedunculate raceme, peduncle pubescent; flowers purple or pink or yellow; lateral sepal 5 mm long; lower sepal spur incurved, apex sometimes slightly swollen and bifid, glabrous). Description: Annual non succulent herb, rarely branched up to 40 cm tall. Stem terete, slightly ridged, without swollen nodes, hairy, purplish red, young shoots and leaves brown tomentulose. Leaves alternate; 3–4 mostly confined to upper parts of stem, petiole 1.0– 4.5 cm long, hairy white with 3–4 pelted glands, exstipulate; lamina oblong ovate, 8–12 × 3–5 cm, base cuneate, oblique, apex acuminate, margin shallowly crenate, setose between teeth, thinly papery, ventrally pubescent along nerves and dark green; lateral veins 5–7 pairs. Inflorescences in leaf axils, monochasial cyme, 2-flowered or rarely 3; peduncle 3–5 cm long, hairy at base and glabrous above, bud yellow with red, glabrous. Pedicel 1.4–1.6 cm long, green, glabrous; bracts 1 × 2 mm long, ovate, acute apex with gland tipped, mid vein not prominent, green, glabrous on both surfaces, persistent. Flower 2.5–3.0 × 3.2–4.1 cm, yellow. Lateral sepals 2, ca. 1 × ca. 2 mm long, ovate, apex acute, margin entire, greenish, glabrous. Lower sepals yellow, bucciniform, 2.8–3.0 × 1.3–1.8 cm with red lines inside; mouth beaked, ca. 1 mm long; spur straight and twisted upward, 1.1–1.4 cm long, reddish yellow, apex bifurcate or emarginate, glabrous. Dorsal petals 1.7–2.0 × 1.5–1.7 cm, obcordate to suborbicular, yellow with red, apex non beaked, dorsally with prominent horn, ca. 7 mm long, red. Lateral united petals 2, 2.5–2.6 cm long (whole), yellow; basal lobe 1.4–1.5 × 0.5–0.6 cm long, obovate, apex obtuse; distal lobes dolabriform, 1.0–1.2 × 2.2–2.3 cm long, apex rounded-obtuse; auricle oblong, 3 × 3 mm long, twisted upward, yellow. Stamens 5, united upright, ca. 4 mm tall, anther lobes obtuse. Ovary glabrous, fusiform, apex acute. Capsule clavate (immature), green. Seeds many. Phenology. September–October. Etymology. The Varity epithet is in dedication to “Dr. K. Ravikumar” who had established National Herbarium of Medicinal Plants used in Indian System of Medicine and also establish Raw Drug Repository of Natural Resources used in Indian Systems of Medicine at The University of Trans disciplinary health sciences and Technology, Bengaluru, India formerly known as FRLHT. Distribution and Ecology. Endemic to Arunachal Pradesh. The variety is only known from Chiyang Tajo of East Kameng district. Observations showed that there were less than 20 mature individuals restricted to 2 km 2 forest areas along stream. Impatiens jurpia var. ravikumareana grows in moist place near the water fall and streams on rocky slopes with little soil at an elevation of 1650–1800 m. along with Elatostema sessile J.R. Forst. & G. Forst. (1776: 106), Impatiens arguta Hook. f. & Thom. (1859: 137), Lecanthus peduncularis (Wall. ex Royle, 1839: 83, f. 2) Wedd. (1869: 164), Pilea medogensis C.J. Chen (1982: 109), Tricarpelema glanduliferum (J. Joseph & R.S. Rao, 1969: 367) Faden (1991: 153), Selaginella tamariscina (P. Beauv., 1804: 483) Spring (1843: 136).Published as part of Tiwari, Umeshkumar L., 2022, A new variety of Impatiens jurpia (Balsaminaceae) from Arunachal Pradesh, India, pp. 280-286 in Phytotaxa 530 (3) on pages 280-283, DOI: 10.11646/phytotaxa.530.3.3, http://zenodo.org/record/583595
Bauhinia bassacensis var. nicobarica Tiwari U. L., K. Ravikumar & N. Balachandran 2013, var. nov.
No full textBauhinia bassacensis var. nicobarica Tiwari U.L., K. Ravikumar & N. Balachandran, var. nov. (Figs. 1 & 2) Differs from the typical variety in having exstipulate leaves, lobes of leaves obtuse at apex, bract rusty tomentose and ovate, bracteoles 2, lanceolate, rusty tomentose; fertile stamens always 2; filaments hairy, anther lobes brown. Type:— INDIA. Great Nicobar Island: Near Army land, Campbell Bay, 20 February 2013, N- 71 o 2’ 2.9’’, E 93 o 55’ 2.9’’, 16 m ASL, K . Ravikumar, N. Balachandran and Umeshkumar Tiwari 115533 (holotype FRLH!; isotypes FRLH!, PBL!). Large, woody, climbers; tendrils coiled stout, glabrous; young branches rusty tomentose, mature grooved and lenticellate. Leaves exstipulate; petioles glabrescent, 2 7 cm long; lamina ovate-cordate, ca. 19 × 13 cm, 9 13-nerved, bifid, down to 3.5 4.8 cm length with narrow sinus, apex of lobes obtuse, base cordate, upper surface glabrous, lower brownish tomentose to glabrescent, base of the lamina with two distinct glands expanding up to pulvinous base. Inflorescences lateral or terminal, many-flowered, racemes or panicles; peduncles rusty tomentose; pedicels ca. 3.5 cm long in flower and ca. 7 cm long in fruit; bracts ovate, rusty tomentose, ca. 0.5 mm long; bracteoles 2, lanceolate, inserted near the middle of the pedicels, rusty tomentose, 1–1.5 mm long. Buds ovoid, rusty tomentose, 4–6 mm long. Hypanthium c. 1 mm long. Calyx during anthesis splitting into 2 segments forming right angles with the pedicels, 5–7 mm long, sometime persistent with fruit. Petals 2 above and three below, pubescent, creamish with purplish-red veins prominent on both sides, blade deltoid, crumpled, subequal, narrowly ovate to suborbicular with undulate margin, ca. 6 × 5 mm; claw 1.5–2 cm long, soft hairy. Stamens 9 (2 + 7); fertile stamens 2, staminodes absent sometime 1; filaments 1.2–1.6cm long, hairy; anthers 1–2 mm long, lobes brown; reduced stamens 7 in number, unequal, 3–9 mm long, filiform, white. Carpels densely brownish pilose, distinctly stalked, styles 6-8 mm, hairy with a small capitate stigma. Pods rusty tomentose, 8–13 × 3–4 cm with persistent style, stalks c. 3 mm long; styles persistent in fruit. Seeds, 2–5, dark brown, flattened, oblong-orbicular, c. 1.5 × 2 cm, smooth, glabrous. Flowering & Fruiting:— From February to March. Distribution:— India: Campbell Bay, Great Nicobar Island, Andaman and Nicobar Islands. Habitat:— Liana in mixed semi-evergreen forests. Ecological status:— About three individuals confined to an area of 1 km 2 were observed during field survey. Though it qualifies to be kept under Critically Endangered (CR) category, further studies and explorations in adjacent areas are required to ascertain its actual status. Etymology:— The varietal epithet refers to the place of its collection. This new variety is allied to typical var. bassacensis and var. backeri, but differs from both markedly in having exstipulate leaves, lobes of leaves obtuse at apex, bract rusty tomentose and ovate, bracteoles 2, lanceolate, rusty tomentose; fertile stamens always 2; filaments hairy, anther lobes brown (see table 1).Published as part of Tiwari, Umeshkumar, Ravikumar, Kaliamoorthy & Balachandran, Natesan, 2013, A new variety of Bauhinia bassacensis (Leguminosae: Caesalpinioideae) from Great Nicobar Island, India, pp. 12-18 in Phytotaxa 149 (1) on pages 13-16, DOI: 10.11646/phytotaxa.149.1.2, http://zenodo.org/record/510042
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
sophisticated methods
- …
