Your search for articles mentioning the genus Arum has found 17 articles.

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Michael Madison Protection of developing seeds in neotropical Araceae (Buy)
 ABSTRACT: In flowering plants with animal pollination and seed dispersal the reproductive cycle can be considered to consist of four stages, representing alternating phases of protection and display. In the protective phases immature flowers and fruits are safeguarded from predation and parasitism, while in the display phases pollinators and dispersal vectors are attracted. This alternation of protection and display is accomplished by a variety of mechanisms.
Harald Riedl The importance of ecology for generic and specific differentiation in the Araceae-Aroideae (Buy)
 ABSTRACT: It is Meusel's (1951) merit to have pointed out the significance of growth-habit for interpreting the evolution of a particular group of plants. In his paper he chose Araceae and Lemnaceae as striking examples to prove his point. While it is rather difficult to translate the German terminology he used for those plants which produce persistent parts above the ground, the term "geophytes" fits well for all those which persist with their subterranean parts alone. Among Araceae, rhizomatous and tuberous geophytes are known. Subfamily Aroideae is composed almost entirely of members of the latter group with the exception of plants growing in water or at least swampy ground, like Lagenandra. While, according to Meusel, intermediates between rhizomatous and tuberous geophytes are found in Colocasioideae, geophytes are rare or absent in the rest of the family.
Dan H. Nicholson Translation of Engler's classification of Araceae with updating (Buy)
 ABSTRACT: When Hooker (1883) was preparing the treatment of Araceae (Aroideae) for the monumental 'Genera Plantarum,' he basically followed the Schottian system, incorporating Engler's (1879) reduction in the number of genera. The first system was "popularized" by Hutchinson (1959) who, with a reversal of the sequence (bisexual genera first), published essentially an English translation of Hooker's latin. Engler (1905-1920), in his monumental 'Das Pflanzenreich', produced his final treatment of the family, including all then known species in nine volumes. This work remains the standard reference for the family as a whole.
Peter C. Boyce A new species of Arum L. from Crete
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 ABSTRACT: Arum purpureospathum Boyce sp. nov. is described.
Josef Bogner Morphological variation in aroids (Buy)
 ABSTRACT: The Araceae or aroid., are a large family of about 2400 species, grouped in 107 genera and these again in nine subfamilies. The aroids are mainly a tropical family and are distributed world-wide. They show great variation in their morphological characters, which will be described in this paper along with some other data.
Thomas B. Croat Ecology and life forms of Araceae (Buy Back Issue)
 ABSTRACT: The most interesting aspect of the family's ecology is the diversity of adaptive life forms. These range from submerged to free-floating, and emergent aquatics to terrestrial plants and to epilithic or epiphytic forms which may be true epiphytes or hemiepiphytic (growing on trees but rooted in soil). Hemiepiphytism is diverse itself, with some species beginning their lives as terrestrial seedlings, then growing skototropically (toward darkness) until they arrive at the nearest suitable tree ( usually a relatively large one which casts a darker shadow) where a physiological change takes place allowing them to grow toward light (Strong & Ray, 1975). They grow as appressed epiphytes on trees or as vines in the canopy. Others begin their lives as true epiphytes, some reconverting to hemiepiphytes by producing long, dangling roots contacting the forest floor below.
William T. Drysdale Cultural companions of Zantedeschia
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 ABSTRACT: There are several aroids that superficially resemble Zantedeschia and may be grown in the Mediterranean-like climates of southern California in the ground year round.
Gitte Peterson Chromosome numbers of the genera Araceae (Buy)
 ABSTRACT: An overview of the chromosome numbers of the genera of Araceae is given.
Dorothy C. Bay Thermogenesis in aroids (Buy)
 ABSTRACT: Thermogenesis, as it occurs in the plant inflorescence has been observed and studied for over two centuries. At least seven thermogenic families of plants are known including Annonaceae, Araceae, Arecaceae, Aristolochiaceae, Cycadaceae, Cyclanthaceae, and Nymphaeaceae. The sequence of thermogenic events is very precise and highly synchronized in each species. The physiology is not well understood, but the recent identification of salicylic acid as the triggering hormone for thermogenesis has opened the door for further research, especially in the areas of plant signal transduction pathways and systemically acquired resistances. Thermogenesis has proven to be an advantageous process to plants for maximizing pollination and limiting hybridization. Beetle pollinators also benefit from the phenomenon.
Thomas B. Croat History and current status of systemic research with Araceae (Buy Back Issue)
 ABSTRACT: This paper will cover all systematic and floristic work that deals with Araceae which is known to me. It will not, in general, deal with agronomic papers on Araceae such as the rich literature on taro and its cultivation, nor will it deal with smaller papers of a technical nature or those dealing with pollination biology. It will include review papers on technical subjects and all works, regardless of their nature, of current aroid researchers. It is hoped that other reviews will be forthcoming which will cover separately the technical papers dealing with anatomy, cytology, physiology, palenology, and other similar areas and that still another review will be published on the subject of pollination biology of Araceae and the rich literature dealing with thermogenesis.
Marc Gibernau, D. Macquart, A. Diaz Pollen viability and longevity in two species of Arum (Buy)
 ABSTRACT: Pollen-loaded insects are not obligatorily captured rapidly by odoriferous inflorescences after their escape from a 'pollen-donor' inflorescence, but may be caught two or three days later. In such a situation, can these insects be considered as pollinators (Le., pollen vectors) or just visitors? Our results confirm that pollen grains in both species Arum italicum and A. maculatum quickly lose their viability. In natural conditions, pollen must then be dispersed quickly between male phase and female phase inflorescences in order for the pollination to be efficient. In fact, it should happen during the first hours after female psychoda are liberated by male phase inflorescences. This is because pollinators captured on subsequent days would most probably carry non-viable pollen and thus would not pollinate the inflorescence they visit. In natural conditions, pollen grains were viable for two days. By contrast, refrigerated pollen was viable for a longer time (4-5 days). Thus refrigeration at 8 or 15°C appears to be a good method to store pollen and prolong its viability.
Marc Gibernau, C. Favre, Thierry Talou, C. Raynaud Floral odor of Arum italicum (Buy)
 ABSTRACT: Volatile compounds emitted by the appendix of Arum italicum Mill. in the South of France were analysed. Three chemotypes were found. The first was rich in fatty acid derivatives (about 75%) but was found in only one individual and needs to be confirmed. A second profile (4 individuals) showed a high proportion (57-84% of the blend) of monoterpenes (~-citronellene and 3,7-dimethyl-1-octene, its reduced chemical form). The third profile (2 individuals sampled twice) was rich 09- 85% of the blend) in sesquiterpenes, particularly two isomers ('Y and ~) of caryophyllene. Moreover p-cresol and 2-heptanone were also present in the blend. Further work is needed to resolve whether these odor differences are different chemotypes of Arum italicum, temporal variation during the flowering season or analytical and experimental biases.
Marc Gibernau, D. Macquart, G. Przetak Pollination in the genus Arum - A review (Buy)
 ABSTRACT: The 28 species of the genus Arum (Araceae) attract and temporarily trap insects (mainly flies, and beetles in a few cases) during a complex pollination process. At anthesis, the appendix of the inflorescence produces heat and emits a specific odor which attracts insects. The lured insects are trapped within the floral chamber when stigmas are receptive. They will be released about 24h later after pollen emission, ensuring pollen dissemination. Studies on the reproductive biology of the genus have shown some degree of variability in the pollination strategies: morphological variations, flowering and heating periods, odor types and the type of pollinating insects. Most species of Arum have never been studied in depth but data available from the literature indicate quite a high diversity of pollination strategy within this genus. Consequently, a general pollination model is not valid at the level of the whole genus. The origin of this diversity certainly results from the biogeographic history of the genus. The plants (Le. species) have developed adaptations in response to different climatic, ecological and biotic (i.e. entomofauna) constraints (Le. selective pressures) according to the various habitats occupied in the different regions of Europe and the Middle East. However, in the absence of phylogenetic data, it is actually impossible to determine how these different reproductive strategies have developed and evolved during the history of this genus.
M. Bedalov, P. Küpfer A study on the genus Arum (Araceae) (Buy)
 ABSTRACT: On the base of literature data, field investigations, studies of herbarium collections and plants in culture, the authors summarize the taxonomic, phytogeographical, karyological and palynological knowledge of certain species of the genus Arum. Special attention is addressed to Arum cylindraceum s.l. (that is with A. alpinum, A. lucanum, A. intermedium and A. maculatum subsp. danicum included). Some comments are also given about A. apulum and A. idaeum. The misinterpretation of many species were mostly caused by old and incomplete first diagnoses, lack of type specimens and locus classiCUS, complicated by a large variability which is linked partly with hybridization.
Peter C. Boyce Arum -- a decade of change (Buy)
 ABSTRACT: When published in 1993 The Genus Arum (Boyce, 1993) presented for the first time in 70 years, and ever in English, a tool to identify with some degree of confidence all of the 25 Arum species and their subordinate taxa then recognized. Inevitably since publication there have been changes in species delimitation as well as new discoveries, such that the species tally for Arum now stands at 28. Changes of note since 1993 include the recognition of two species treated then at subspecific rank within A. orientale Bieb. [A. longispathum Reich. & A. sintenisii (Eng!.) P. C. Boyce] while a further species [A. alpinariae (K. Alpinar & R. R. Mill) P. C. Boyce], treated then as a subspecies of A. elongatum Steven, is formally raised to the level of species in this paper. Additional study has resolved a number of issues including application of names for the species hitherto called A. alpinum Schott & Kotschy and the status of subordinal taxa in A. italicum Miller. These are all detailed below together with sundry other observations. While much work remains to be done on Arum it seems a worthwhile exercise to present an overview of these changes wrought in the past decade and to cast some pointers for work that still remains to be tackled.
Marc Gibernau, J. Albre Size variations of flowering characters in Arum italicum (Araceae) (Buy)
 ABSTRACT: In Arum, bigger individuals should proportionally invest more in the female function (number or weight of female flowers) than the male. The aim of this paper is to quantify variations in reproductive characters (size of the spadix parts, number of inflorescences) in relation to plant and inflorescence sizes. The appendix represents 44% of the spadix length. The female zone length represents 16.5% of the spadix length and is much longer than the male zone (6%). Moreover these three spadix zones increase with plant vigour indicating an increasing investment into reproduction and pollinator attraction. It appears that the length of appendix increased proportionally more than the lengths of the fertile zones. On average an inflorescence counts 156 male flowers and 61 female flowers which result in a male-biased floral ratio in A. italicum. The numbers of male and female flowers increased significantly with the spadix size but differently according to the gender, the number of female flowers increasing faster than male: on the other hand this effect was marginally significantly (p = .08). This relative gender difference of flower number increase is visualised by a significant decrease of the maleness floral ratio with spadix size.
M. Chartier, Marc Gibernau Size variation of flowering characters in Arum maculatum (Araceae) (Buy)