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| Saunders,Janice G.. |
| Waltheria carmensarae, a homostylous species from northeastern Argentina, southeastern Paraguay, and central Venezuela, and W. procumbens, a distylous species from northeastern Paraguay, are newly described and illustrated. Both species share along with some other species of Waltheria sect. Waltheria and all of sect. Stegowaltheria an elongate-plumose stigma, adaxial petals with raised succulent midribs, petals adnate to the stamen tube for more than 0.8 mm in length, and a capsule with hardened endocarp only at the apex. Waltheria carmensarae resembles the distylous species W. preslii, endemic to coastal Guerrero and Oaxaca, Mexico, whereas W. procumbens appears to be close to W. albicans, primarily from Brazil where distylous, with scattered homostylous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Waltheria; Hermannieae; Byttnerioideae; Malvaceae s.l.; Argentina; Paraguay; Venezuela; Pollen morphology. |
| Ano: 2005 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932005000100013 |
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| Dessein, S.; Ochoterena, H.; De Block, P.; Lens, F.; Robbrecht, E.; Schols, P.; Smets, E.; Vinckier, S.; Huysmans, S.. |
| In the 1990s Rubiaceae became a hot spot for systematists, mainly due to the comprehensive treatment of the family by Robbrecht in 1988. Next to the exploration of macromolecular characters to infer the phylogeny, the palynology of Rubiaceae finally received the attention it deserves. This article aims to present a state-of-the-art analysis of the systematic palynology of the family. The range of variation in pollen morphology is wide, and some of the pollen features are not known from other angiosperm taxa; e.g., a looplike or spiral pattern for the position of apertures in pantoaperturate grains. We compiled an online database at the generic level for the major pollen characters and orbicule presence in Rubiaceae. An overview of the variation is... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Rubiaceae; Pollen morphology; Palynology; Phylogeny. |
| Ano: 2005 |
URL: http://www.repository.naturalis.nl/record/407298 |
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| Parnell, J.. |
| Pollen of 57 species of Syzygium from SE Asia were surveyed by SEM. The grains are all ± triangular in polar view, uniformly small (mean diameter 10.4 μm) with few surface sculpturing features. All species examined exhibit a distinct apocolpium and, usually, apocolpial field. The presence of an apocolpial field cannot be linked to any known taxonomic grouping within the genus. It does not appear possible to distinguish the species of Syzygium on the basis of features of the pollen visible under SEM, though section Jambosa tends to have larger pollen with a proportionally larger apocolpium than species not in that section. Estimates for the number of pollen grains per stamen in species with larger pollen grains (± section Jambosa) are 5× as great as for... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Myrtaceae; Syzygium; Breeding biology; Pollen morphology. |
| Ano: 2003 |
URL: http://www.repository.naturalis.nl/record/525712 |
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| Gupta, C.; Dash, S.S.. |
| A new species, Rubus ramachandrae, from Upper Subansiri district of Arunachal Pradesh, India is described and illustrated. It is closely similar to R. stipulosus and R. fuscifolius but differs by densely bristly or hirsute branches; narrowly ovate or oblong-lanceolate leaves with caudate-acuminate apex and adaxially hirsutulous vesture; abaxially grey tomentose intermixed with hirsutulous hairs; larger size of stipules and bracts with distinct margin and vesture; smaller size of floral structure. The distinct foliar as well as floral morphology of R. ramachandrae differs from all previously described species of Rubus. Differences in key morphological characters of R. ramachandrae, R. stipulosus and R. fuscifolius are also tabulated. In addition, pollen... |
| Tipo: Article / Letter to the editor |
Palavras-chave: India; New taxa; Pollen morphology; Rosaceae; Rubus; Subgenus Malachobatus. |
| Ano: 2018 |
URL: http://www.repository.naturalis.nl/record/649791 |
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| Dessein, S.; Harwood, R.; Smets, E.; Robbrecht, E.. |
| Complementary to the revision of the genus Spermacoce in the Northern Territory of Australia, pollen morphology of 48 of the 53 native Spermacoce species from the Northern Territory has been investigated by scanning electron and light microscopy. There is considerable variation for most diagnostic pollen characters. The average equatorial diameter (E) ranges from 10.5 to 41.7 μm. Grains are invariably colporate with apertures situated at the equator (being zonocolporate). The number of apertures varies from 3 to 17. The endoaperture is generally an endocingulum, often with a secondary thinning at the ectocolpus; one species has endocolpi. The sexine is usually perforate, but psilate, foveolate, and (micro)reticulate patterns were also found. Supratectal... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Spermacoce; Rubiaceae; Pollen morphology; Palynology; Australia; Northern Territory. |
| Ano: 2005 |
URL: http://www.repository.naturalis.nl/record/407293 |
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| Araújo,Rita de Cássia Matos dos Santos; Nunes,Teonildes Sacramento; Saba,Marileide Dias; Andrade,Brunelle Ramos; Nascimento,Anacleide Pereira do; Santos,Francisco de Assis Ribeiro dos. |
| ABSTRACT This study aims to expand knowledge of the pollen morphology of Passifloraceae and contribute to the taxonomic delimitation of the group by morphologically characterizing pollen grains of species that occur in the Brazilian state of Bahia. Thirty-six species occur in the state, one of the genus Mitostemma (M. glaziovii) and 35 of the genus Passiflora. Pollen samples were acetolysed, measured, and described using light and scanning electron microscopy. The results group the studied species into four pollen types based mainly on aperture type and number, opercular variation, and the presence/absence of ornamentation elements inside the lumina of the reticulum: Pollen type I - species belonging to the subgenera Astrophea and Deidamioides; pollen type... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Mitostemma; Passiflora; Palynology; Pollen morphology; Taxonomy. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100054 |
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| LUZ,CYNTHIA F.P. DA; MAKI,ERICA S.; HORÁK-TERRA,INGRID; VIDAL-TORRADO,PABLO; MENDONçA FILHO,CARLOS VICTOR. |
| The presented paper considered the pollen morphology of thirteen species belonging to seven genera of the Fabaceae family occurring in the Pau-de-Fruta Special Protection Area (SPA), Diamantina, state of Minas Gerais, Brazil. The pollen grains of six species ofChamaecrista [C. cathartica (Mart.) H.S. Irwin & Barneby, C. debilis Vogel, C. flexuosa (L.) Greene, C. hedysaroides (Vogel) H.S. Irwin & Barneby, C. glandulosa (L.) Greene, and C. papillata H.S. Irwin & Barneby] have a similar morphology, characterized by three long colporated apertures with a central constriction. The species share specific morphological features regarding pollen size, endoaperture type (circular, lalongate or lolongate) and SEM ornamentation patterns of the exine... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Espinhaço Southern Mountain Range; Fabaceae; Palynology; Pollen morphology. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401329 |
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