View source for Ephemerum

{{Treatment/ID
|accepted_name=Ephemerum
|accepted_authority=Hampe
|publications={{Treatment/Publication
|title=Flora
|place=20: 285. 1837,
}}
|basionyms=
|synonyms=
|hierarchy=Ephemeraceae;Ephemerum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Ephemeraceae]]</div><div class="higher-taxon"><small>genus</small>[[Ephemerum]]</div></div>
|etymology=Greek ephemeros, of short duration
|volume=Volume 27
|mention_page=page 647, 648, 649, 653
|treatment_page=page 650
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>absent. <b>Leaves</b> scarcely contorted when dry; costa well-developed, except generally absent or weak in <i>E. serratum</i>; laminal cells lax in the proximal half of the leaf, in the distal half firmer, smaller, and usually papillose. <b>Sexual</b> condition dioicous or autoicous, commonly rhizautoicous. <b>Capsule</b> cleistocarpous, ovoid and distinctly apiculate, more than 0.5 mm from base to apex; exothecium of 2 cell layers; columella present in maturing capsules of <i>E. cohaerens</i>, but in other species visible only as pigmented areas at base and tip of the spore sac. <b>Calyptra</b> fugacious, cucullate, sometimes lobed or torn at the base, covering the distal 2/3 of the capsule, mostly more than 0.2 mm.</span><!--

-->{{Treatment/Body
|distribution=Nearly worldwide in temperate and tropical regions.
|discussion=<p>Species ca. 28 (4 in the flora).</p><!--
--><p>All <i>Ephemerum</i> taxa in the flora have the same chromosome number, n = 27. Mixed colonies are common, although hybrid forms are not evident. To a large extent, the species occupy similar ranges.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaves ecostate or in the distal two-thirds very weakly costate.
|[[Ephemerum serratum|Ephemerum serratum]]
|-id=key-0-1
|1
|Leaves distinctly costate, at least distal to the middle
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Distal laminal cells spinulose or spinose.
|[[Ephemerum spinulosum|Ephemerum spinulosum]]
|-id=key-0-2
|2
|Distal laminal cells smooth or papillose
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Distal laminal cells smooth, in ± diagonal rows.
|[[Ephemerum cohaerens|Ephemerum cohaerens]]
|-id=key-0-3
|3
|Distal laminal cells papillose in ± vertical rows.
|[[Ephemerum crassinervium|Ephemerum crassinervium]]
|}
</div></div><!--

-->{{#Taxon:
name=Ephemerum
|authority=Hampe
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Ephemeraceae
|distribution=Nearly worldwide in temperate and tropical regions.
|reference=None
|publication title=Flora
|publication year=
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V27/V27_958.xml
|genus=Ephemerum
}}<!--

-->[[Category:Treatment]][[Category:Ephemeraceae]]