View source for Arida riparia

{{Treatment/ID
|accepted_name=Arida riparia
|accepted_authority=(Kunth) D. R. Morgan & R. L. Hartman
|publications={{Treatment/Publication
|title=Sida
|place=20: 1414. 2003
|year=2003
}}
|common_names=Chiricahua mountain tansy-aster;alkali aster
|basionyms={{Treatment/ID/Basionym
|name=Aster riparius
|authority=Kunth
|rank=species
|publication_title=in A. von Humboldt et al., Nov. Gen. Sp.
|publication_place=4(fol.): 72. 1818;  4(qto): 92. 1820
}}
|synonyms={{Treatment/ID/Synonym
|name=Machaeranthera riparia
|authority=(Kunth) A. G. Jones
|rank=species
}} {{Treatment/ID/Synonym
|name=Machaeranthera sonorae
|authority=(A. Gray) Stucky
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Arida;Arida riparia
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Astereae]]</div><div class="higher-taxon"><small>genus</small>[[Arida]]</div><div class="higher-taxon"><small>species</small>[[Arida riparia]]</div></div>
|volume=Volume 20
|mention_page=page 402, 403
|treatment_page=page 405
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 25–60 cm; taproots slender to thick. <b>Stems</b> 1–12+, erect or ascending, straight and rigid, sometimes sprawling from base, branching from base and distally, glabrous, glaucous. <b>Leaves</b> mostly cauline; sessile (± appressed); blades oblanceolate, 20–30 × 3–5 mm, reduced distally, (thick, succulent) bases broadened, margins entire (incised to dentate in hybrids with <i>A. parviflora</i>) eciliate or with 1–8 cilia per side, apices linear, spiny-mucronate, glabrous; distal subulate, entire. <b>Heads</b> borne singly (terminal), often in loose, leafy, cymiform arrays. <b>Involucres</b> hemispheric, 10–12 × 10–16 mm (fresh). <b>Phyllaries</b> in 4–5 series, appressed, linear-lanceolate, 2–8 mm, bases whitish to tan, margins entire to laciniate, apices green, acute to acuminate, glabrous. <b>Ray</b> florets 50–80+; laminae bluish purple to lavender, 10–12 mm, coiled after flowering. <b>Disc</b> florets 45–100+; corollas yellow, 3.5–5 mm. <b>Cypselae</b> oblanceoloid, 2.5–3 mm, 11–13-nerved per face, faces sparsely sericeous; pappi: white, setose; ray 3–3.5 mm; disc 3–4 mm. <b>2n</b> = 10.</span><!--

-->{{Treatment/Body
|phenology=Flowering Apr–Sep.
|habitat=Low valleys, saline soils on mudflats, edges of playas
|elevation=1300–1400 m
|distribution=Ariz.;N.Mex.;Mexico (Chihuahua;Coahuila;Durango;Zacatecas).
|discussion=<p><i>Arida riparia</i> is a distinctive species recognized by its V-shaped branching, narrow, succulent, somewhat appressed, spiny-tipped leaves, and relatively large heads. It is known to hybridize with <i>A. parviflora</i> in southeastern Arizona and adjacent New Mexico. Specimens with dentate leaf margins usually represent hybrids.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Arida riparia
|authority=(Kunth) D. R. Morgan & R. L. Hartman
|rank=species
|parent rank=genus
|synonyms=Machaeranthera riparia;Machaeranthera sonorae
|basionyms=Aster riparius
|family=Asteraceae
|phenology=Flowering Apr–Sep.
|habitat=Low valleys, saline soils on mudflats, edges of playas
|elevation=1300–1400 m
|distribution=Ariz.;N.Mex.;Mexico (Chihuahua;Coahuila;Durango;Zacatecas).
|reference=None
|publication title=Sida
|publication year=2003
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V20_926.xml
|tribe=Asteraceae tribe Astereae
|genus=Arida
|species=Arida riparia
}}<!--

-->[[Category:Treatment]][[Category:Arida]]