View source for Luetkea ← Luetkea You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{Treatment/ID |accepted_name=Luetkea |accepted_authority=Bongard |publications={{Treatment/Publication |title=Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. |place=6, Sci. Math. 2: 130, plate 2. 1832 |year=1832 }} |special_status={{Treatment/ID/Special_status |code=E |label=Endemic }} |basionyms= |synonyms= |hierarchy=Rosaceae;Rosaceae subfam. Amygdaloideae;Rosaceae tribe Spiraeeae;Luetkea |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Rosaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Rosaceae subfam. Amygdaloideae]]</div><div class="higher-taxon"><small>tribe</small>[[Rosaceae tribe Spiraeeae]]</div><div class="higher-taxon"><small>genus</small>[[Luetkea]]</div></div> |etymology=For Friedrich Benjamin Lütke (later russified to Count Fyodor Petrovich Litke), 1797 – 1882 Russian sea captain and Arctic explorer |volume=Volume 9 |mention_page=page 398, 422 |treatment_page=page 421 }}<!-- --><span class="statement" id="st-undefined" data-properties=""><b>Subshrubs,</b> mat-forming, 1–1.5(–3) dm; rhizomatous, stoloniferous. <b>Stems</b> 1–5(–12), prostrate, glabrous. <b>Leaves</b> persistent, often marcescent, cauline, alternate (internodes elongating apically), primarily crowded basally, simple; petiole present, narrowly winged; blade obtrullate, 0.5–1.5 cm, pergamentaceous, 2–3(–5)-ternately lobed, margins flat, venation suprabasal, actinodromous, surfaces glabrous. <b>Inflorescences</b> terminal, 5–20(–30)-flowered, racemes, glabrescent to villous; peduncles present; bracts reducing acropetally from 2-ternate to simple, linear; bracteoles absent. <b>Pedicels</b> present. <b>Flowers</b> 3–6 mm diam.; epicalyx bractlets 0; hypanthium hemispheric, 0.5–1 mm, glabrous or villous; sepals 5, spreading to erect, deltate; petals 5, white, spatulate to obovate; stamens 20, shorter than petals, filaments basally connate; torus thickened, 10-lobed; carpels (4 or)5(or 6), free, adaxially sparsely villous, styles terminal; ovules 3–5. <b>Fruits</b> aggregated follicles, (4 or)5(or 6), falcate, truncated at proximal end, 2–3 mm, sericeous adaxially; hypanthium persistent; sepals persistent, spreading to erect; styles deciduous. <b>Seeds</b> 1–4, elongate-fusiform. <b>x</b> = 9.</span><!-- -->{{Treatment/Body |distribution=nw North America. |discussion=<p>Species 1.</p><!-- --><p>D. Potter et al. (2007b), using nucleotide sequence data, grouped <i>Aruncus</i> and <i>Luetkea</i> into a subclade that was a sister group to the <i>Holodiscus</i>-Xerospiraea subclade; these two subclades composed a clade with strong support. A cladistic and numerical taxonomic study of Amygdaloideae (J. Henrickson 1985) using morphologic characters ascertained that <i>Kelseya</i> and <i>Petrophytum</i> were sister groups on both phenogram and cladogram; <i>Luetkea</i> and Xerospiraea exchanged positions depending upon the method used. In his evaluation of carpel anatomy in <i>Aruncus</i> (two species), <i>Holodiscus</i> (eight taxa), <i>L. pectinata</i>, and <i>Petrophytum</i> (four species), C. Sterling (1966) found that the combination of character states found in <i>Luetkea</i> was unlike those of any other of these taxa and similar only to those of some species of <i>Spiraea</i>. R. J. Hebda and C. C. Chinnappa (1990b) proposed two evolutionary lineages of <i>Rosaceae</i> based upon pollen perforation types, with <i>Luetkea</i> and 13 other genera in one lineage; <i>Aruncus</i> and four other genera formed the other. If the phylogeny proposed by Potter is correct (<i>Aruncus</i> and <i>Luetkea</i> are sister taxa), then their divergence is probably not an evolutionarily recent event; they are quite distinct in carpel anatomy and overall morphology.</p> |tables= |references= }}<!-- --><!-- -->{{#Taxon: name=Luetkea |author=Richard Lis |authority=Bongard |rank=genus |parent rank=tribe |synonyms= |basionyms= |family=Rosaceae |distribution=nw North America. |reference=None |publication title=Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. |publication year=1832 |special status=Endemic |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V9/V9_710.xml |subfamily=Rosaceae subfam. Amygdaloideae |tribe=Rosaceae tribe Spiraeeae |genus=Luetkea }}<!-- -->[[Category:Treatment]][[Category:Rosaceae tribe Spiraeeae]] Templates used on this page: Template:Rosaceae (view source) Template:Treatment/AuthorLink (view source) Template:Treatment/Body (view source) Template:Treatment/Body/Maps (view source) Template:Treatment/ID (view source) Template:Treatment/ID/Special status (view source) Template:Treatment/Publication (view source) Return to Luetkea.