<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1409-3871</journal-id>
<journal-title><![CDATA[Lankesteriana]]></journal-title>
<abbrev-journal-title><![CDATA[Lankesteriana]]></abbrev-journal-title>
<issn>1409-3871</issn>
<publisher>
<publisher-name><![CDATA[Lankester Botanical Garden, University of Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1409-38712017000200193</article-id>
<article-id pub-id-type="doi">10.15517/lank.v17i2.29928</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Novelties in Costa Rican Stelis (Orchidaceae: Pleurothallidinae): two new species and a new record in the &#8220;Dracontia Group&#8221;]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Karremans]]></surname>
<given-names><![CDATA[Adam P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Morales]]></surname>
<given-names><![CDATA[Melissa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Jardín Botánico Lankester ]]></institution>
<addr-line><![CDATA[Cartago ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Leiden University Naturalis Biodiversity Center ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Netherlands</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>17</volume>
<numero>2</numero>
<fpage>193</fpage>
<lpage>202</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1409-38712017000200193&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1409-38712017000200193&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1409-38712017000200193&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Stelis dies-natalis and Stelis aenigma, belonging to a group of mostly Middle American species alternatively placed in genus Dracontia, are described and illustrated based on living material. They were both found in oak forests at high elevations on diverse peaks of the Talamanca mountain range in Costa Rica. The first, S. dies-natalis, was found on Cerro Buena Vista and Cerro Urán, and is somewhat similar to S. hydra but can be distinguished by the relatively short inflorescence, the dark purple flowers with a yellow lip covered by dark purple warts, the apiculate apex of the petals and the lip with a shortly acuminate apicule. The second, S. aenigma, was initially believed to be a specimen of S. dies-natalis when it was collected on Cerro Utyum, but it can be easily distinguished by the few-flowered inflorescence that barely exceeds the leaf, the reddish flowers, the sigmoid lip and the cucullate, obtuse anther. Stelis platystylis, a species previously known from Mexico to Nicaragua is illustrated based on living material from Costa Rica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Stelis dies-natalis y Stelis aenigma, pertenecientes a un grupo de especies en su mayoría Centroamericanas colocadas alternativamente en el género Dracontia, son descritas e ilustradas basadas en material vivo. Ambas se encontraron en robledales de altura en diferentes picos de la Cordillera de Talamanca en Costa Rica. La primera, S. dies-natalis, se encontró en los Cerros Buena Vista y Urán, es similar a S. hydra pero se puede distinguir por la inflorescencia relativamente corta, las flores morado oscuro con un labelo amarillo cubierto por verrugas morado oscuro, los pétalos apiculados y el labelo con un apículo brevemente acuminado. La segunda, S. aenigma, que se pensaba inicialmente que se trataría de un espécimen de S. diesnatalis cuando se colectó en el Cerro Utyum, pero se puede distinguir fácilmente por las inflorescencias con pocas flores que apenas supera el tamaño de la hoja, las flores rojizas, el labelo sigmoideo y la antera obtusa y cuculada. Stelis platystylis, una especie previamente conocida de México a Nicaragua, es ilustraba basada en material vivo de Costa Rica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Dracontia]]></kwd>
<kwd lng="en"><![CDATA[Stelis]]></kwd>
<kwd lng="en"><![CDATA[S. aenigma]]></kwd>
<kwd lng="en"><![CDATA[S. dies-natalis]]></kwd>
<kwd lng="en"><![CDATA[S. hydra]]></kwd>
<kwd lng="en"><![CDATA[S. platystylis.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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