View source for Diaperia

{{Treatment/ID
|accepted_name=Diaperia
|accepted_authority=Nuttall
|publications={{Treatment/Publication
|title=Trans. Amer. Philos. Soc., n. s.
|place=7: 337. 1840
|year=1840
}}
|common_names=Rabbit-tobacco;dwarf cudweed
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Evax sect. Diaperia
|authority=(Nuttall) A. Gray
}}
|hierarchy=Asteraceae;Asteraceae tribe Gnaphalieae;Diaperia
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Gnaphalieae]]</div><div class="higher-taxon"><small>genus</small>[[Diaperia]]</div></div>
|etymology=Greek diapero, to pass through, alluding to pseudo-polytomous branching pattern (“proliferous inflorescence”) of type species
|volume=Volume 19
|mention_page=page 26, 388, 461
|treatment_page=page 460
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 3–25 cm. <b>Stems</b> 1, erect, or 2–10, ascending to ± prostrate. <b>Leaves</b> basal and cauline; alternate; blades oblanceolate to obovate. <b>Heads</b> borne singly or in glomerules of 2–40+ in ± dichasiform, pseudo-polytomous, spiciform, or racemiform arrays. <b>Involucres</b> inconspicuous. <b>Phyllaries</b> (2–)4–6, ± equal (similar to paleae). <b>Receptacles</b> pulvinate to conic (heights 0.2–2.4 times diams.), glabrous. <b>Pistillate</b> paleae readily falling (all or inner together, ± coherent distally by tangled indument) or outermost sometimes persistent, erect to ascending; bodies with 5+ nerves (nerves ± parallel, obscure), oblanceolate to oblong, flat to concave most of lengths (not enclosing florets); wings 0. <b>Staminate</b> or bisexual paleae readily falling (coherent with pistillate), (1–)3–5, erect to apically somewhat spreading or incurved (scarcely enlarged) in fruit, slightly surpassing pistillate paleae; bodies ± spatulate (apices entire, sometimes involute and ± gibbous). <b>Pistillate</b> florets 13–35+. <b>Functionally</b> staminate or bisexual florets 2–5; corolla lobes mostly 4, equal or unequal. <b>Cypselae</b> light to dark brown, monomorphic: terete to obcompressed, ± obovoid, ± straight, not gibbous, faces glabrous, minutely papillate, dull or ± shiny; corolla scars apical; pappi 0. <b>x</b> = 7.</span><!--

-->{{Treatment/Body
|distribution=c United States;n Mexico.
|discussion=<p>Species 3 (3 in the flora).</p><!--
--><p>See discussion of Filagininae following the tribal description (p. 385).</p><!--
--><p><i>Diaperia</i> occurs in open, moist or dry habitats of humid to semiarid, temperate to subtropical climates. Though apparently not aggressively invasive in their native range, the species are competitive in disturbed habitats (vacant lots, fallow fields, lawns, cemeteries, and roadsides). <i>Diaperia verna </i>var.<i> verna</i>, in particular, is widely regarded as a weed; the species are potentially invasive outside the flora.</p><!--
--><p><i>Diaperia</i> appears to be monophyletic, with ancestors near Evax sect. Filaginoides Smoljaninova of the Mediterranean basin and central Asia (particularly E. eriosphaera Boissier & Heldreich; J. D. Morefield 1992). It is separated from Evax by stems well-developed, leafy, usually branched, paleae falling together (coherent distally by tangled indument), and staminate paleae somewhat enlarged, apices obtuse, ± herbaceous, uniformly hairy (Morefield 2004). Species of <i>Diaperia</i> are sharply distinct by size, shape, and arrangement of branches, glomerules, heads, and capitular leaves.</p><!--
--><p><i>Diaperia candida</i> is aberrant by its inner florets bisexual, bisexual paleae distally gibbous, and reported chromosome complement of 2n = 14 (D. J. Keil and D. J. Pinkava 1976). These traits might eventually justify resurrection of the monotypic Calymmandra Torrey & A. Gray, after further study and confirmation of the chromosome number. While 2n = 14 is common elsewhere in Gnaphalieae, all other 25 counted species of Filagininae have 2n = 28 (species of Evax, <i>Filago</i>, <i>Logfia</i>, <i>Micropus</i>, <i>Psilocarphus</i>, and <i>Stylocline</i>) or 2n = 26 (<i>Diaperia</i> and Evax). The implication that <i>D. candida</i> retains an ancestral diploid condition has no phylogenetic support (J. D. Morefield 1992).</p>
|tables=
|references={{Treatment/Reference
|id=shinners1951a
|text=Shinners, L. H. 1951. The Texas species of Evax (Compositae). Field & Lab. 19: 125–126.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Heads in racemiform or spiciform arrays, 1.5–2 mm; branches proximal or none; longest pistillate paleae 0.9–1.3 mm; bisexual florets 3–5 (corollas 0.5–0.9 mm, protruding from heads); functionally staminate florets usually 0
|[[Diaperia candida|Diaperia candida]]
|-id=key-0-1
|1
|Heads in ± dichasiform or pseudo-polytomous arrays, 2–4.5 mm; branches proximal and distal, rarely none; longest pistillate paleae 1.9–4 mm; bisexual florets 0; functionally staminate florets 2–5 (corollas 1.4–2.5 mm, hidden in heads)
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Heads in subdichasiform arrays, ± campanulate to spheric, 2–3.3 mm, heights ± equal to diams.; capitular leaves ± hidden between and surpassed by heads; pistillate paleae scarcely imbricate; cypselae mostly 0.7–0.9 mm
|[[Diaperia verna|Diaperia verna]]
|-id=key-0-2
|2
|Heads in strictly dichasiform or pseudo-polytomous arrays (sometimes appearing monochasiform), ellipsoid to ± cylindric, 3.5–4.5 mm, heights 2–3 times diams.; capitular leaves visible between and surpassing heads; pistillate paleae imbricate; cypselae mostly 0.9–1.2 mm
|[[Diaperia prolifera|Diaperia prolifera]]
|}
</div></div><!--

-->{{#Taxon:
name=Diaperia
|author=James D. Morefield
|authority=Nuttall
|rank=genus
|parent rank=tribe
|synonyms=Evax sect. Diaperia
|basionyms=
|family=Asteraceae
|illustrator=Linny Heagy
|distribution=c United States;n Mexico.
|reference=shinners1951a
|publication title=Trans. Amer. Philos. Soc., n. s.
|publication year=1840
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V19_766.xml
|tribe=Asteraceae tribe Gnaphalieae
|genus=Diaperia
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae tribe Gnaphalieae]]