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 Aruncus and Luetkea into a subclade that was a sister group to the Holodiscus-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 Kelseya and Petrophytum were sister groups on both phenogram and cladogram; Luetkea and Xerospiraea exchanged positions depending upon the method used. In his evaluation of carpel anatomy in Aruncus (two species), Holodiscus (eight taxa), L. pectinata, and Petrophytum (four species), C. Sterling (1966) found that the combination of character states found in Luetkea was unlike those of any other of these taxa and similar only to those of some species of Spiraea. R. J. Hebda and C. C. Chinnappa (1990b) proposed two evolutionary lineages of Rosaceae based upon pollen perforation types, with Luetkea and 13 other genera in one lineage; Aruncus and four other genera formed the other. If the phylogeny proposed by Potter is correct (Aruncus and Luetkea 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://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/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.