View source for Urtica

{{Treatment/ID
|accepted_name=Urtica
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 983. 175
}}, {{Treatment/Publication
|title=Gen. Pl. ed.
|place=5, 423. 1754
|year=1754
}}
|common_names=Nettle;ortie
|basionyms=
|synonyms=
|hierarchy=Urticaceae;Urtica
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Urticaceae]]</div><div class="higher-taxon"><small>genus</small>[[Urtica]]</div></div>
|etymology=Latin urtica, nettle; derived from Latin uro, to burn
|volume=Volume 3
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual or perennial, with stinging and nonstinging hairs on same plant. <b>Stems</b> simple or branched, erect, ascending, or sprawling. <b>Leaves</b> opposite; stipules present. <b>Leaf</b> blades elliptic, lanceolate, ovate, or orbiculate, margins dentate to serrate; cystoliths rounded or ± elongate. <b>Inflorescences</b> axillary, lax, of cymes arranged in racemes or panicles. <b>Flowers</b> unisexual, staminate and pistillate flowers in loose to tight clusters in separate inflorescences or intermixed in same inflorescence on same or different plants; bracts narrowly triangular to lanceolate, lacking hooked hairs. <b>Staminate</b> flowers: tepals 4, distinct, equal; stamens 4; pistillode cuplike. <b>Pistillate</b> flowers: tepals 4, distinct, inner 2 equal to achene, outer 2 smaller, without hooked hairs; staminodes absent; style absent; stigma tufted, persistent or deciduous. <b>Achenes</b> sessile, laterally compressed, ovoid or deltoid, loosely enclosed by inner tepals. <b>x</b> = 12, 13.</span><!--

-->{{Treatment/Body
|distribution=Nearly worldwide.
|discussion=<p>Species 45 (4 in the flora).</p>
|tables=
|references={{Treatment/Reference
|id=woodland1976a
|text=Woodland, D. W., I. J. Bassett, and C. W. Crompton. 1976. The annual species of stinging nettle (Hesperocnide and Urtica) in North America. Canad. J. Bot. 54: 374-383.
}}{{Treatment/Reference
|id=woodland1982a
|text=Woodland, D. W. 1982. Biosystematics of the perennial North American taxa of Urtica. II. Taxonomy. Syst. Bot. 7: 282-290.
}}{{Treatment/Reference
|id=woodland1982b
|text=Woodland, D. W., I. J. Bassett, L. Crompton, and S. Forget. 1982. Biosystematics of the perennial North American taxa of Urtica. I. Chromosome number, hybridization, and palynology. Syst. Bot. 7: 269-281.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Plants perennial, rhizomatous; inflorescences either staminate or pistillate.
|[[Urtica dioica|Urtica dioica]]
|-id=key-0-1
|1
|Plants annual, with taproot; inflorescences with both staminate and pistillate flowers (or staminate and pistillate flowers in separate inflorescences in Urtica gracilenta).
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Leaf blades elliptic to broadly elliptic, widest near middle, base cuneate; achenes 1.5–1.8mm.
|[[Urtica urens|Urtica urens]]
|-id=key-0-2
|2
|Leaf blades narrowly ovate to orbiculate, usually widest below middle or near base or occasionally cuneate at base, base ± cordate to truncate or rounded, sometimes distal leaves ovate-lanceolate to lanceolate; achenes 1.2–1.6mm.
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Inflorescences ±globose; staminate and pistillate flowers intermixed in same inflorescence.
|[[Urtica chamaedryoides|Urtica chamaedryoides]]
|-id=key-0-3
|3
|Inflorescences elongate; staminate and pistillate flowers in separate inflorescences, or a few pistillate flowers at apex of staminate inflorescences.
|[[Urtica gracilenta|Urtica gracilenta]]
|}
</div></div><!--

-->{{#Taxon:
name=Urtica
|authority=Linnaeus
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Urticaceae
|distribution=Nearly worldwide.
|reference=woodland1976a;woodland1982a;woodland1982b
|publication title=Sp. Pl.;Gen. Pl. ed.
|publication year=;1754
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V3/V3_329.xml
|genus=Urtica
}}<!--

-->[[Category:Treatment]][[Category:Urticaceae]]