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Jacquemontia robertsoniana. A habit; B part of adaxial face near midrib, C leaf, abaxial face near midrib; D trichomes; E inflorescence detail; F sepals, from left to right, external to internal; G open flower; H detail of abaxial surface of corolla showing puberulence. From holotype, Conceição & Cardoso 1293 (HUEFS). DRAWN BY REGINA CARVALHO.
Source publication
Jacquemontia robertsoniana, a new shrub species from Brazil, is described. The relationship of J. robertsoniana with other shrub species of this genus is discussed. Illustrations, a distribution map, and an identification key are provided. The conservation status is assessed according to IUCN criteria.
Context in source publication
Context 1
... longer, caudate to obtuse with an acumen, tomentose, greyish; veins not evident. Petiole 0.05 -0.1 cm long. Inflorescence terminal, compound cymes, capituliform, c. 6-flowered, sessile, terminal; modified bracteoles lacking. elliptic, oval-flat; nectary absent; ovary c. 1 mm long, glabrous, 2-locular, 2 ovules per locule. Fruits not seen. Fig. 1 (2001) B1 criteria, because the estimated extent of occurrence for this species is less than 20,000 km², it is restricted to less than ten locations, and a continuing decline in the number of mature individuals is inferred. Although this species occurs in a preserved area (Chapada Diamantina National Park), access is not closely ...
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Citations
... Numerous floristic and taxonomic studies and descriptions of new Jacquemontia species have been published in the last decade, contributing to our knowledge of the genus in South America (Krapovickas 2009;Buril and Alves 2011, 2012a, 2012b, 2013Buril et al. 2012;Simão-Bianchini 2015, 2016;Nepomuceno et al. 2022). Various studies focusing on the diversity of Convolvulaceae have been undertaken in the Amazon region, either in terms of describing new taxa or floristic surveys (Falcão 1971;Austin 1981;Simão-Bianchini et al. 2016). ...
... For the Amazon, Austin and Cavalcante (1982) cited 10 species of Jacquemontia. However, as has been discussed by other authors, the taxonomy of the genus is not well known, mainly due to overlapping morphological characters that make species delimitation very difficult (Meisner 1869;Buril et al. 2012;Buril 2013;Belo et al. 2023a). ...
... Morphological characters such as the leaf apex, leaf indument type, as well as sepal shape, size, apex, and indument, have typically been used as taxonomic characters in species identification and delimitation in Jacquemontia (Buril and Alves 2011, 2012a, 2012b, 2013Buril et al. 2012;Pastore and Simão-Bianchini 2015Nepomuceno et al. 2022;Belo et al. 2023a). Jacquemontia has numerous species complexes formed by highly polymorphic species showing great morphological variability and thus being imprecisely described (Buril 2013), such as the Jacquemontia pentanthos (Jacq.) ...
A new species of Jacquemontia found in Carajás National Forest, Brazil, Jacquemontia ferricola sp. nov., is described for an area with a unique flora threatened by mining. We provide a diagnosis of the new species, morphological and anatomical descriptions, illustrations, scanning electron microscopy images, with comments on its distribution and conservation status. The new species was compared with the Brazilian Amazonian Jacquemontia species and an identification key is provided.
KEYWORDS:
biodiversity; Brazilian flora; Carajás National Forest; ironstone savannas; taxonomy
... However, microendemicity (and rarity), as indicated for some of the taxa revealed by Model 5, is not rare in the family (Buril et al. 2014) and in the last decades, several new species have been described from very isolated areas (e.g. Buril and Alves 2012, 2013, Santos et al. 2020a. This is probably occurring because of the increasing research on highly diverse and underexplored geographic areas, the increasing number of taxonomists specialists in the family, especially from underdeveloped countries where, again, a high diversity of species can be found, and is due to more accurate analysis of species delimitation. ...
Cryptic species continue to intrigue taxonomists over time and hamper biodiversity knowledge. An example of what would be considered a cryptic species is Daustinia montana (Convolvulaceae). Its wide leaf morphology plasticity has led to multiple interpretations and contrasting classifications: from a monotypic to a six-taxa hypothesis. For this work, we tested six taxonomic hypotheses, including an explicit test of a monotypic approach, under a robust statistical analysis, using univariate and multivariate methods. Besides that, we performed a niche analysis to verify the niche occupation of the populations recognized here as possible species. Forty-eight micro and macromorphological characters (qualitative and quantitative) from individuals of 16 populations of D. montana were evaluated. The taxonomic hypothesis that recognizes eight distinct species has the highest support as they also have non-overlapping niches. We conclude that the number of species in Daustinia may be greater than its current circumscription. We also highlight the importance of an integrative systematic approach in the study of biodiversity. This research represents a first step in the specific delimitations of the genus and can also serve as a model to study taxa with wide morphological variability.
... Embora investigada por diversos especialistas, devido a sua grande diversidade no nordeste (e.g., Falcão & Falcão 1976, 1977, 1978, 1984Joly 1970;Junqueira & Simão-Bianchini 2006;Simão-Bianchini 2002, lacunas ainda persistem. Destacam-se, recentemente os esforços para a realização de estudos focados na família que têm ampliado o número de taxa conhecidos (e.g., Barbosa et al. 2007Barbosa et al. , 2012Buril 2013;Buril & Alves 2011a, b, 2012a, b, 2013Buril et al. 2012Delgado-Júnior et al. 2014;Marinho et al. 2017;Santos et al. 2017;Silva & Simão-Bianchini 2014;Pastore & Simão-Bianchini 2016;Vasconcelos 2015;Vasconcelos et al. 2016;Wood et al. 2017a,b) e apontam para uma diversidade maior quando comparada aos levantamentos florísticos previamente realizados nas áreas estudadas (Araújo & Alves 2010, para o estado de Pernambuco; Harley & Mayo 1980;Harley & Simmons 1986;Simão-Bianchini 1995, 2003Junqueira & Simão-Bianchini 2003, para (Fig. 2). As Dunas fixas estão situadas entres as Dunas móveis e o Tabuleiro costeiro, e são cobertas por vegetação pioneira, constituída de espécies herbáceas e arbustivas. ...
Resumo Esse estudo teve como objetivo realizar o levantamento florístico das espécies de Convolvulaceae ocorrentes na Área de Proteção Ambiental Jenipabu - APAJ. Os dados foram obtidos a partir de expedições de campo aleatórias, no período de agosto de 2010 a julho de 2011. Foram registradas nove espécies, distribuídas em cinco gêneros: Daustinia montana, Distimake aegyptius, Evolvulus frankenioides, E. ovatus, Ipomoea asarifolia, I. brasiliana, I. pes-caprae, I. rosea, e Jacquemontia bahiensis. Destaca-se que D. montana, I. asarifolia e I. pes-caprae ocorreram preferencialmente em áreas úmidas, e as demais foram encontradas em áreas secas. Daustinia montana, I. brasiliana, e J. bahiensis são endêmicas do Brasil e I. rosea é endêmica do nordeste brasileiro. A morfologia das folhas, sépalas e gineceu foram os principais caracteres para diagnosticar as espécies. O tratamento possui chave de identificação, descrições, pranchas ilustrativas e comentários sobre a distribuição dos táxons.
... Its flowers exhibit a gamma petal configuration (five joined petals) in an infundibuliform shape, and a chalice with five separate sepals. This family has about 59 genera distributed in more than 1600 specimens [36,37]. ...
Sweet potato (Ipomoea batatas (L.) Lam) is a dicotyledonous angiosperm plant which belongs to the Convolvulaceae family and its capable of producing nutritious tuberous roots eaten worldwide. Its origin, as well as the circumstances related to its worldwide dispersion, are pertinent questions and intrigue researchers till nowadays. China is the main sweet potato producing country, and the Asian continent has the largest share of world production. In Brazil, sweet potatoes are specially grown by small farmers and used to domestic market supply. The sweet potato arouses huge interest when considering its nutritional qualities, mainly because it is rich in fibers, micronutrients, and an excellent source of energy for the consumer. The colored pulp cultivars such as yellow, orange, and purple sweet potatoes have in their composition several bioactive compounds such as polyphenols, carotenoids, and anthocyanins. In this regard, the work presents a review of the main aspects related to taxonomy, morphology, history, world production, and Brazilian production, highlighting the nutritional potential and the social relevance of sweet potatoes as a crop.
... O gênero Jacquemontia Choisy é representado por plantas perenes ou anuais, em geral volúveis, ocorrentes principalmente na América tropical, com poucas espécies na Ásia tropical, Austrália e África (Rhui-Cheng & Staples 1995), sendo o quarto maior gênero de Convolvulaceae em número de espécies, com pouco mais de 120 (Staples 2012). No Brasil, suas espécies podem ser encontradas nos mais diversos tipos de vegetação, como caatinga, campo rupestre, cerrado, mata ciliar, borda de fl orestas e de restinga (Buril et al. 2012, Moreira et al. 2015. Entretanto, a maior riqueza e os mais altos níveis de endemismo ocorrem no Cerrado, Caatinga e Chaco (Buril & Alves 2011). ...
... Sintetizando conceitos de diferentes autores (Choisy 1834, Meisner 1869, Robertson 1971, Buril et al. 2012, Pastore & Simão-Bianchini 2015, Jacquemontia difere dos demais gêneros de Convolvulaceae, especialmente pelo conjunto dos seguintes caracteres: tricomas estrelados ou forcados, corola geralmente glabra, grão de pólen pantocolpado ou tricolpado; ovário 2-locular com 2 óvulos em cada lóculo; estilete único com 2 estigmas ovoides e achatados dorsiventralmente, (assemelhando-se à uma língua); cápsulas geralmente abrindo-se por 8 valvas, e sementes glabras que na maioria das vezes são estreitamente aladas ao longo das duas margens laterais. O gênero tem sido considerado taxonomicamente complexo, com espécies que são difíceis de delimitar devido à sobreposição de caracteres (Robertson 1971). ...
Synopsis of Jacquemontia Choisy (Convolvulaceae) in the States of Goiás and Tocantins, Brazil). Jacquemontia is the fourth largest genus of Convolvulaceae in relation to species richness. This genus includes approximately 130 species, mostly concentrated in tropical America, of which 67 occur in Brazil. The fl oristic survey of Jacquemontia for the Brazilian States of Goiás and Tocantins revealed the occurrence of 17 species, of which 15 occur in Goiás and seven in Tocantins. We provide an identification key, data on geographical distribution, habitat, and images for all species of Jacquemontia occurring in the area.
... The Brazilian cerrado and caatinga vegetation includes a great part of Convolvulaceae biodiversity, and includes several endemic species including the one described here. According to Buril et al. (2012) nearly 30% of the species of Jacquemontia grow in the Brazilian Semi-arid region. ...
Jacquemontia aequisepala (Convolvulaceae) is native to semi-arid areas of Bahia and Minas Gerais, Brazil. This species is morphologically similar to six species of the genus. Key characteristics are indumentum type, trichome type, form and size of the sepals, pairs of secondary veins on leaves, and pollen grain type. Photographs in the field, a pollen image, line drawing, and identification key to J. aequisepala are provided. © 2016, The Board of Trustees of the Royal Botanic Gardens, Kew.
... During the taxonomic revision of the Brazilian species of Jacquemontia (Buril & alves 2011, 2012a, 2012b, 2013, Buril et al. 2012, Buril 2013, two species, namely J. montana (Moric.) Meisn. ...
Austinia, a new genus of Convolvulaceae is described and its relationship with other genera is discussed. Two species previously placed in Jacquemontia are referable to the genus. However, a revision of species delimitation demonstrates that the two are conspecific. Austinia therefore comprises a single species, endemic to Brazil.
A new species from the Atlantic Forest of northeastern Brazil, Jacquemontia atlantica, is described and illustrated. A distribution map, karyological characters, and an identification key for the species of that genus found in the Atlantic Forest are also provided, and its informal conservation status is assessed according to IUCN criteria. Its relationships with Jacquemontia glaucescens and other morphologically close species are discussed.
Resumo Convolvulaceae inclui cerca de 2.000 espécies distribuídas predominantemente na região tropical. No Brasil, são reconhecidas aproximadamente 400 espécies associadas a todos os domínios fitogeográficos, mas, predominantes na vegetação aberta como o Cerrado e a Caatinga. Este trabalho consiste no estudo florístico-taxonômico de Convolvulaceae no Parque Ecológico Engenheiro Ávidos (PECEA), Unidade de Conservação estadual situada no semiárido paraibano, na Região Nordeste do Brasil. Coletas foram realizadas entre Agosto/2014 e Março/2016 e os espécimes identificados através da literatura especializada. Na área de estudo foram encontradas 20 espécies distribuídas em cinco gêneros: Ipomoea (10 espécies), Jacquemontia (quatro), Evolvulus (três), Distimake (duas) e Cuscuta (uma). São apresentadas descrições morfológicas e uma chave para separação das espécies, bem como dados fenológicos, de distribuição geográfica baseados na literatura e no Herbário Virtual Reflora e dos ambientes preferenciais através de observações em campo das espécies registradas. Três espécies de Ipomoea constituem novos registros para a Paraíba: I. amnicola, I. incarnata e I. ramosissima, e Evolvulus flavus foi recentemente descrita como endêmica do Estado.
As a part of a taxonomic update of the family Convolvulaceae Juss. for Guayana Shield, the species Jacquemontia austiniana J.R.Grande sp. nov., is described and illustrated as new to science. This species is characterized by its linear-subulate bract, ovate-lanceolate external sepals, conspicuously acuminate, villose, with the margins ciliate, and a relatively large and infundibuliform corolla. To date, this is the only species of Jacquemontia Choisy endemic to the Guayana Shield; its relationships within the genus are still to be elucidated.
