Haseltonia最新文献_第8页

Areole Changes during Bark Formation on Saguaro Cacti 仙人掌树皮形成过程中微孔的变化

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0109

L. Evans, Ryan L'Abbat

{"title":"Areole Changes during Bark Formation on Saguaro Cacti","authors":"L. Evans, Ryan L'Abbat","doi":"10.2985/026.024.0109","DOIUrl":"https://doi.org/10.2985/026.024.0109","url":null,"abstract":"Abstract: Spines are an important component of cactus species. Besides providing protection from predation, they reduce heat loading, reduce transpiration, and aid dispersal of stem segments for vegetative propagation among others. Bark formation occurs on surfaces of more than twenty species of columnar cacti in the Americas. For all species tested, bark formation is related to direct sunlight exposure. Extensive bark coverage leads to premature death for saguaro cacti (Carnegiea gigantea). Preliminary evidence indicates that changes in areoles with spines occurred during the bark formation on C. gigantea. Four hundred, sixty-one paired photographic images of areoles of north- and south-facing surfaces of shoots with bark percentages on adjacent troughs in 2017 were analyzed to determine differences between north- and south-facing surfaces. As in past studies, south-facing surfaces had higher bark percentages (mean bark coverage 62%) than north-facing surfaces (mean bark coverage 19%). For north and south areoles, mean numbers of central spines were 2.70/1.55; radial spines 3.20/1.50; and apex spines 1.81/1.13, respectively. When data were pooled to compare numbers of central, radial and apex spines as well as spine color and spine thickness, all were significantly related with bark percentages. Decreases in numbers and characteristics of spines precede bark formation on adjacent troughs. Overall, the results show that crests deteriorate faster than adjacent troughs. To our knowledge, this is the first report to document changes in spine numbers and characteristics with bark coverage on a cactus species.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"197 1","pages":"55 - 62"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76955417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

The Taxonomy of Kalanchoe hirta Harv. and K. crenata (Andrews) Haw. (Crassulaceae), and Reinstatement of K. hirta as a Distinctive, Endemic Species from Southern and South-Tropical Africa kalanchane hirta Harv的分类。和K. crenata (Andrews) Haw。(天竺葵科)，以及作为南部和南热带非洲特有物种的hirta的恢复

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0107

Gideon F. Smith, E. Figueiredo, N. Crouch

引用次数: 3

Anthropic Pressure on the Diversity of Cactaceae in a Region of Atlantic Forest in Eastern Brazil 巴西东部大西洋森林地区仙人掌科生物多样性的人为压力

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0105

W. C. Cardoso, Alice Calvente, V. F. Dutra, C. M. Sakuragui

{"title":"Anthropic Pressure on the Diversity of Cactaceae in a Region of Atlantic Forest in Eastern Brazil","authors":"W. C. Cardoso, Alice Calvente, V. F. Dutra, C. M. Sakuragui","doi":"10.2985/026.024.0105","DOIUrl":"https://doi.org/10.2985/026.024.0105","url":null,"abstract":"Abstract: Cactaceae are a highly endangered plant family with economical and ornamental potential. One of its centers of diversity and endemism is in Eastern Brazil, including the Atlantic Forest in the state of Espírito Santo. The latest Brazilian global floristic inventory recorded 41 cactus species for this state, however an exclusive study about Cactaceae is still necessary to survey and describe the actual diversity of the family in the region and current threats acting upon the cacti. The aim of this study was to survey the species of Cactaceae in Espírito Santo state and analyze the threats suffered by them. A database produced from fieldwork, herbarium and literature research resulted in 908 georeferenced records which served for the production of distribution maps and to analyze sampling efforts and species richness. The richest grid cells were positively correlated to the best sampled cells. In total 38 native species of Cactaceae were found, including epiphytic, rupicolous, and terricolous life-forms. Several threats to the conservation of cacti in the region are acting to reduce the habitat of native populations. Our results indicate the need to include an effective sampling of cactus specimens in order to understand the real conservation of the species of this highly endangered family.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"141 1","pages":"28 - 35"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88549913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Historical Note about Rooting Succulent Leaf Cuttings 多肉插条生根的历史记录

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0110

Root Gorelick

引用次数: 0

Drosanthemum decumbens (Aizoaceae), a New Status for an Obligatory Cremnophyte from the Western Cape, South Africa 南非西开普省一种专性砂生植物的新定位

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0102

E. Jaarsveld

引用次数: 2

Natural History Notes for the Columnar, Globular and Semi-Epiphytic Cactus Species of the Island of Puerto Rico 波多黎各岛柱状、球状和半附生仙人掌的自然历史记录

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0104

Roberto CARRERA-MARTÍNEZ, Jorge Ruiz-Arocho, Laura A. Aponte-Díaz, D. Jenkins

引用次数: 6

Notes on the Typification and Nomenclature of Agave dissimulans Trelease, Agave convallis Trelease, and Agave kerchovei Lem. (Asparagaceae: Agavoideae / Agavaceae) 龙舌兰(Agave dissimulans)、龙舌兰(Agave convallis)和龙舌兰(Agave kerchovei Lem)的类型学和命名注释。(天冬科:龙舌兰科/龙舌兰科)

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0106

Gideon F. Smith, Estrela Figuereido, G. Starr

{"title":"Notes on the Typification and Nomenclature of Agave dissimulans Trelease, Agave convallis Trelease, and Agave kerchovei Lem. (Asparagaceae: Agavoideae / Agavaceae)","authors":"Gideon F. Smith, Estrela Figuereido, G. Starr","doi":"10.2985/026.024.0106","DOIUrl":"https://doi.org/10.2985/026.024.0106","url":null,"abstract":"Abstract: The typification of the names Agave convallis Trelease and A. dissimulans Trelease is discussed and clarified. We show that the two Trelease 4 specimens associated with the name A. convallis are not duplicates (they have different collecting dates). The Trelease 4 specimen dated 5 February 1905 (barcode MO-1128755; MO specimen number 3346866) is the lectotype of the name A. convallis, while the other Trelease 4 specimen dated 12 February 1905 (barcode MO-1256267; MO specimen number 3346867) is a syntype. We confirm the lectotypification of the name A. dissimulans, with one of the two Trelease 81 specimens dated 11 February 1905 (barcode MO-1128757; MO specimen number 3346870). The other Trelease 81 specimen, which is also dated 11 February 1905 (barcode MO-1128758; MO specimen number 3346869), is an isolectotype. The typification status of Trelease 82, which is also dated 11 February 1905 [barcode MO-1256273; MO specimen number 3346871], is that of syntype. All the Trelease specimens mentioned here are held in the Herbarium of the Missouri Botanical Garden (MO). For the sake of completeness we also refer to the typification, and clarify the etymology, of the name Agave kerchovei Lem. This species is a close relative of A. convallis and A. dissimulans.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"45 1","pages":"36 - 39"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81883005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A Putative Intercladal Echinopsis s.l. (Cactaceae) Hybrid from Andean Chile 来自智利安第斯山脉的一个假定的枝间棘藓(仙人掌科)杂交种

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0103

U. Eggli, Mario Giorgetta

引用次数: 1

A New Species of Ceropegia Sect. Rhytidocaulon (Apocynaceae) from Southern Yemen 标题也门南部麻麻科麻麻属一新种

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-08-01 DOI: 10.2985/026.024.0108

P. Hanáček, P. Bruyns

引用次数: 0

Chromosome Numbers in Some Cacti of Western North America — IX 北美西部一些仙人掌的染色体数目- 9

IF 1.5 4区生物学

Haseltonia Pub Date : 2018-01-01 DOI: 10.2985/026.025.0103

M. Baker, D. Pinkava

{"title":"Chromosome Numbers in Some Cacti of Western North America — IX","authors":"M. Baker, D. Pinkava","doi":"10.2985/026.025.0103","DOIUrl":"https://doi.org/10.2985/026.025.0103","url":null,"abstract":"Abstract: Chromosome numbers are determined for 524 individuals belonging to 107 taxa, including nothotaxa, within Cactaceae. Chromosome morphology was uniform within and among species. Nine unnamed nothotaxa and one previously named nothotaxon, Cylindropuntia ×vivipara, have chromosome numbers reported for the first time, and new chromosome numbers are reported for three taxa. Five putative Cylindropuntia hybrids are reported here for the first time: C. alcahes var. gigantensis × C. lindsayi, C. bernardina × C. echinocarpa, C. leptocaulis × C. ramosissima, C. echinocarpa × C. ramosissima, and C. echinocarpa × C. ganderi var. ganderi. Two putative Opuntia hybrids of less-certain origin are reported here: O. azurea var. discolor × O. rufida, and O. chlorotica × O. engelmannii. Two putative hybrids are reported for Echinocereus: E. arizonicus subsp. arizonicus × E. bonkerae subsp. bonkerae and E. coccineus subsp. coccineus × E. yavapaiensis. All chromosome number determinations reported to date are tabulated for Cylindropuntia, Grusonia, and selected taxa within Echinocereus. The significance of these data is discussed, including apparent correlations among polyploidy, subdioecy, sexual reproduction, and apomixis. We introduce six new combinations, one nothospecies designation, and a lectotypification for one taxon.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"41 1","pages":"29 - 5"},"PeriodicalIF":1.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77995362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8