View source for Arenaria lanuginosa

{{Treatment/ID
|accepted_name=Arenaria lanuginosa
|accepted_authority=(Michaux) Rohrbach in C. F. P. von Martius et al.
|publications={{Treatment/Publication
|title=in C. F. P. von Martius et al., Fl. Bras.
|place=14(2): 274. 1872
|year=1872
}}
|common_names=Spreading sandwort
|basionyms={{Treatment/ID/Basionym
|name=Spergulastrum lanuginosum
|authority=Michaux
|rank=species
|publication_title=Fl. Bor.-Amer.
|publication_place=1: 275. 1803
}}
|synonyms=
|hierarchy=Caryophyllaceae;Caryophyllaceae subfam. Alsinoideae;Arenaria;Arenaria lanuginosa
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Caryophyllaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Caryophyllaceae subfam. Alsinoideae]]</div><div class="higher-taxon"><small>genus</small>[[Arenaria]]</div><div class="higher-taxon"><small>species</small>[[Arenaria lanuginosa]]</div></div>
|volume=Volume 5
|mention_page=page 52, 54, 55
|treatment_page=page 53
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>± strongly perennial, possibly blooming first year, not matted. <b>Taproots</b> filiform to moderately thickened; rhizomes often present, slender, 2–15+ cm. <b>Stems</b> 1–80+, erect or ascending to procumbent or prostrate to trailing, green, 5–60 cm; internodes terete to angular, 1/3–8+ times as long as leaves, dull, retrorsely pubescent throughout or in lines, hairs minute. <b>Leaves</b> usually connate basally, with scarious sheath 0.1–0.5 mm, occasionally petiolate (proximal leaves) or sessile; petiole 2–5 mm; blade 1-veined, vein prominent abaxially, linear-lanceolate to narrowly elliptic or oblanceolate, 3–35 × 2–14 mm, herbaceous, margins thickened, scarious, shiny, ciliate proximally or throughout, apex obtuse or acute to apiculate, often minutely pustulate, ciliate on margins and adaxial midrib; axillary leaf clusters absent. <b>Inflorescences</b> axillary, solitary flowers or in proliferating, mostly terminal, leafy, 1–80+-flowered cymes. <b>Pedicels</b> erect to ascending (often arcuately so), or straight to widely divergent, often hooked distally in fruit, 2–40 mm, retrorsely pubescent. <b>Flowers</b>: sepals green, 1–3-veined, 2 lateral veins 1/4–3/4 times as long as midvein, often appearing prominently keeled proximally, lanceolate to ovate (herbaceous portion oblong or lanceolate to ovate), 2–5 mm, to 5.5 mm in fruit, apex acute to acuminate, not pustulate, glabrous; petals narrowly spatulate to obovate, 1.5–6 mm, 1/2–12/5 times as long as sepals or absent, apex obtuse to rounded, petals sometimes absent. <b>Capsules</b> ± loosely to tightly enclosed by calyx, ovoid, 3–6 mm, 4/5–11/2 times as long as sepals. <b>Seeds</b> 8–35, black, suborbicular, slightly compressed, 0.7–0.8 mm, shiny, smooth. <b>2n</b> = 40, 44.</span><!--

-->{{Treatment/Body
|distribution=North America (including Mexico);Central America;South America.
|discussion=<p>Varieties 4+ (2 in the flora).</p><!--
--><p><i>Arenaria lanuginosa</i> is morphologically diverse, both in our area and southward into northern South America, and is in serious need of comprehensive study. Other species in subg. Leiosperma (e.g., A. gypsostrata B. L. Turner) that occur in Mexico resemble <i>A. lanuginosa</i>; the nature of those relationships also requires study. We have taken the “conservative approach” of treating the two taxa that occur in the flora area as varieties.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Stems often 1-10, prostrate to trailing; inflorescences of solitary, axillary flowers; petals absent or 1/ 3/ 4 times as long as sepals
|[[Arenaria lanuginosa var. lanuginosa|Arenaria lanuginosa var. lanuginosa]]
|-id=key-0-1
|1
|Stems 1-80+, erect or ascending to procumbent; inflorescences of proliferating, leafy, 1-80+-flowered cymes; petals 3/ 2/ 5 times as long as sepals
|[[Arenaria lanuginosa var. saxosa|Arenaria lanuginosa var. saxosa]]
|}
</div></div><!--

-->{{#Taxon:
name=Arenaria lanuginosa
|authority=(Michaux) Rohrbach in C. F. P. von Martius et al.
|rank=species
|parent rank=genus
|synonyms=
|basionyms=Spergulastrum lanuginosum
|family=Caryophyllaceae
|distribution=North America (including Mexico);Central America;South America.
|reference=None
|publication title=in C. F. P. von Martius et al., Fl. Bras.
|publication year=1872
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V5/V5_103.xml
|subfamily=Caryophyllaceae subfam. Alsinoideae
|genus=Arenaria
|species=Arenaria lanuginosa
}}<!--

-->[[Category:Treatment]][[Category:Arenaria]]