Abstract
During studies on the flora of Moquegua (Southern Peru), some interesting Arenaria populations (subgen. Dicranilla, Caryophyllaceae) were found. The morphology of the plants does not resemble any other neotropical Arenaria species. The most similar species known so far is Arenaria boliviana (from Bolivia and Peru) from which it differs in having a shorter stem length, ciliate (not glabrous) short branches; ovate rather than oblong-lanceolate leaves always covered with dense, long trichomes, never glabrous; pedicels shorter than or equal to the size of the calyx (not twice as long), sepals broadly ovate (not ovate-oblong) and with glabrous surface, as well as in the petals. Hence, a new species—A. acaulis—is here described and illustrated.
Highlights
Arenaria Linnaeus (1753: 423) is a genus of about 200 species distributed in Eurasia, America, and northern Africa (Williams 1898, Zhou 1996, Hartman et al 2005)
The species of Arenaria are annual or perennial, with leaves ovate to lanceolate, petals usually with margins entire, stamens 10, disk more or less developed, (2–)3 styles and capsules opening with twice as many teeth as there are styles (Macbride 1937, McNeill 1962, Volponi 1985, Hartman 2005) Based on molecular data Arenaria was shown to be polyphyletic by Fior (2006, 2007) a result that was further corroborated by Harbaugh et al (2010) and by Greenberg et al (2011)
A recent taxonomic review is lacking for both these South American subgenera, Accepted by Duilio Iamonico: 29 Jun. 2015; published: 16 Jul. 2015
Summary
Arenaria Linnaeus (1753: 423) is a genus of about 200 species distributed in Eurasia, America, and northern Africa (Williams 1898, Zhou 1996, Hartman et al 2005). Como parte de los estudios de la flora del departamento de Moquegua (Sur de Perú), unas poblaciones interesantes de Arenaria The species of Arenaria are annual or perennial (often caespitose), with leaves ovate to lanceolate, petals usually with margins entire, stamens 10, disk more or less developed, (2–)3 styles and capsules opening with twice as many teeth as there are styles (Macbride 1937, McNeill 1962, Volponi 1985, Hartman 2005) Based on molecular data Arenaria was shown to be polyphyletic by Fior (2006, 2007) a result that was further corroborated by Harbaugh et al (2010) and by Greenberg et al (2011).
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