Dracaena, gli indigeni delle Canarie lo consideravano un albero sacro

Mario Pria
/
28 gennaio 2018
/
Views 565

Gli esploratori spagnoli si trovarono di fronte ad un esemplare di un altezza di 24 metri senza la chioma, e con un tronco la cui circonferenza non poteva essere abbracciata da meno di dieci uomini

La sua caratteristica principale è la suddivisione del tronco, che avviene dicotomicamente

Durante le vacanze natalizie, sul lungomare di Sanremo, mi sono imbattuto in questo bell'esemplare di Dracaena draco, con lo stesso stupore che probabilmente provarono gli spagnoli, nel 1462, quando sbarcarono a Tenerife e la notarono alle pendici del vulcano Orotava. Gli indigeni delle Canarie lo consideravano un albero sacro, forse perché la resina che fuoriesce dalle ferite inferte alla corteccia si ossida all'aria assumendo una colorazione rossastra. Per questo motivo è chiamata anche "albero del Drago", da cui la denominazione latina della specie. Anche il nome del genere, d'altra parte, deriva dal greco "drakaina", cioè femmina del drago.
Alle Canarie attualmente ne sopravvivono alcune centinaia di esemplari, alcuni dei quali di dimensioni notevoli, probabilmente molto vecchi. Pensate che gli esploratori spagnoli si trovarono di fronte ad un esemplare descritto di un altezza di 24 metri senza la chioma, e con un tronco la cui circonferenza non poteva essere abbracciata da meno di dieci uomini! Un uragano lo abbatté nel 1867, ma, essendo questa una monocotiledone, non fu possibile individuare l'età della pianta dal numero degli anelli di accrescimento del tronco. Il clima favorevole (inverni a freddo moderato) della bella località ligure permette la sopravvivenza di questa specie arborea, qui fotografata (foto sotto) con i suoi frutti, delle bacche che a maturità assumono colorazione rossastra. Ma la sua caratteristica principale è la suddivisione del tronco, che avviene dicotomicamente (vuol dire che si divide in due parti ciascuna delle quali si suddivide in altre due, e cosi via). Ecco quindi un "drago" amico, che non sputa fuoco, ma ci dà ossigeno per la sopravvivenza!
Mario Pria

Dr.agr. Mario Emanuele Pria - Manutenzione giardini e terrazzi - Corsi online di giardinaggio - www.marioemmepi.it - marioemmepi@gmail.com - 3356032955

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**Una dracaena sul lungomar di Sanremo**

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FreeMarker template error (HTML_DEBUG mode; use RETHROW in production!)

Category passione-natura not found
----
FTL stack trace ("~" means nesting-related):
- Failed at: @get_category name=cat_name var="cate... [in template "dev.sevendaysweb.com/layouts/macro/utils.ftl" in macro "set_primary_category_color" at line 600, column 7]
- Reached through: @set_primary_category_color c [in template "dev.sevendaysweb.com/layouts/macro/content_suggested.ftl" in macro "hs_contents" at line 970, column 25]
- Reached through: @hs_contents ca, contents_preview, co... [in template "dev.sevendaysweb.com/layouts/macro/content_suggested.ftl" in macro "suggested_category_content" at line 461, column 17]
- Reached through: @suggested_category_content ca, last_... [in template "dev.sevendaysweb.com/layouts/macro/content_suggested.ftl" in macro "suggested_contents" at line 223, column 25]
- Reached through: @query name=name cache=false start=st... [in template "dev.sevendaysweb.com/layouts/macro/content_suggested.ftl" in macro "suggested_contents" at line 221, column 9]
- Reached through: @suggested_contents name=(mpName + "i... [in template "dev.sevendaysweb.com/layouts/macro/content_suggested.ftl" in macro "content_suggested" at line 81, column 41]
- Reached through: @query name="categories_area_sect" ca... [in template "dev.sevendaysweb.com/layouts/macro/content_suggested.ftl" in macro "content_suggested" at line 8, column 9]
- Reached through: @content_suggested bundle.OCDetail, "... [in template "dev.sevendaysweb.com/layouts/macro/content_details.ftl" in macro "content_details" at line 357, column 25]
- Reached through: @content var="c" show_last_content=ca... [in template "dev.sevendaysweb.com/layouts/macro/content_details.ftl" in macro "content_details" at line 118, column 9]
- Reached through: @content_details img_full_width=img_f... [in template "dev.sevendaysweb.com/layouts/default.ftl" in macro "contents_column" at line 9, column 13]
- Reached through: @contents_column [in template "dev.sevendaysweb.com/layouts/macro/skeleton.ftl" in macro "container" at line 412, column 49]
- Reached through: @query name="count_areas" cache=false... [in template "dev.sevendaysweb.com/layouts/macro/skeleton.ftl" in macro "container" at line 254, column 5]
- Reached through: @container context, "[left-mid-", "[c... [in template "dev.sevendaysweb.com/layouts/macro/skeleton.ftl" in macro "html" at line 111, column 33]
- Reached through: @cache sv=search_val [in template "dev.sevendaysweb.com/layouts/macro/skeleton.ftl" in macro "html" at line 66, column 9]
- Reached through: @html cat_layout="home" cat_title=tru... [in template "dev.sevendaysweb.com/layouts/default.ftl" at line 24, column 1]
----
Java stack trace (for programmers):
----
freemarker.template.TemplateException: [... Exception message was already printed; see it above ...]
at it.treis.utils.freemarker.BasicHeadingCategoryDirective.getCategoryByName(BasicHeadingCategoryDirective.java:63)
at it.treis.utils.freemarker.CategoryDirective.execute(CategoryDirective.java:65)
at freemarker.core.Environment.visit(Environment.java:377)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:104)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.IfBlock.accept(IfBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:148)
at freemarker.core.Environment.visitIteratorBlock(Environment.java:559)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:67)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.IfBlock.accept(IfBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Environment$NestedElementTemplateDirectiveBody.render(Environment.java:2255)
at it.treis.utils.freemarker.CategoryCachedQueryResultDirective.execute(CategoryCachedQueryResultDirective.java:202)
at freemarker.core.Environment.visit(Environment.java:377)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:104)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.IfBlock.accept(IfBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:148)
at freemarker.core.Environment.visitIteratorBlock(Environment.java:559)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:67)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Environment$NestedElementTemplateDirectiveBody.render(Environment.java:2255)
at it.treis.utils.freemarker.CategoryCachedQueryResultDirective.execute(CategoryCachedQueryResultDirective.java:202)
at freemarker.core.Environment.visit(Environment.java:377)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:104)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.IfBlock.accept(IfBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Environment$NestedElementTemplateDirectiveBody.render(Environment.java:2255)
at it.treis.utils.freemarker.ContentCachedResultDirective.render(ContentCachedResultDirective.java:201)
at it.treis.utils.freemarker.ContentCachedResultDirective.execute(ContentCachedResultDirective.java:181)
at freemarker.core.Environment.visit(Environment.java:377)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:104)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.IfBlock.accept(IfBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.IfBlock.accept(IfBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Environment$NestedElementTemplateDirectiveBody.render(Environment.java:2255)
at it.treis.utils.freemarker.CategoryCachedQueryResultDirective.execute(CategoryCachedQueryResultDirective.java:202)
at freemarker.core.Environment.visit(Environment.java:377)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:104)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.Environment.visitAndTransform(Environment.java:413)
at freemarker.core.CompressedBlock.accept(CompressedBlock.java:37)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Environment$NestedElementTemplateDirectiveBody.render(Environment.java:2255)
at it.treis.utils.freemarker.CacheDirective.execute(CacheDirective.java:71)
at freemarker.core.Environment.visit(Environment.java:377)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:104)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Macro$Context.runMacro(Macro.java:178)
at freemarker.core.Environment.invoke(Environment.java:700)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Environment.process(Environment.java:290)
at freemarker.template.Template.process(Template.java:312)
at org.apache.struts2.views.freemarker.FreemarkerResult.doExecute(FreemarkerResult.java:223)
at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:372)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:276)
at it.treis.smartmedia.navigation.interceptors.PrepareParametersInterceptor.intercept(PrepareParametersInterceptor.java:183)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at it.treis.smartmedia.navigation.interceptors.SubscriptionTokenMatcherInterceptor.intercept(SubscriptionTokenMatcherInterceptor.java:52)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:140)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:575)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:209)
at com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:244)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:190)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:317)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)