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-d0_s0" data-properties=""><b>Subshrubs,</b> mat-forming, 1–1.5 (–3) dm;</span> <span class="statement" id="st-d0_s1" data-properties="whole_organism growth form;whole_organism atypical some measurement;whole_organism some measurement;whole_organism architecture;whole_organism architecture;whole_organism growth form">rhizomatous, stoloniferous.</span> <span class="statement" id="st-d0_s2" data-properties="stem atypical quantity;stem quantity;stem growth form or orientation;stem pubescence"><b>Stems </b>1–5 (–12), prostrate, glabrous.</span> <span class="statement" id="st-d0_s3" data-properties="leaf duration;leaf condition;cauline leaf arrangement;cauline leaf arrangement;cauline leaf architecture"><b>Leaves </b>persistent, often marcescent, cauline, alternate (internodes elongating apically), primarily crowded basally, simple;</span> <span class="statement" id="st-d0_s4" data-properties="petiole presence;petiole architecture">petiole present, narrowly winged;</span> <span class="statement" id="st-d0_s5" data-properties="blade shape;blade some measurement;blade texture;blade shape;margin prominence or shape;margin position;margin architecture;surface pubescence">blade obtrullate, 0.5–1.5 cm, pergamentaceous, 2–3 (–5) -ternately lobed, margins flat, venation suprabasal, actinodromous, surfaces glabrous.</span> <span class="statement" id="st-d0_s6" data-properties="inflorescence position or structure subtype;inflorescence architecture;raceme pubescence"><b>Inflorescences </b>terminal, 5–20 (–30) -flowered, racemes, glabrescent to villous;</span> <span class="statement" id="st-d0_s7" data-properties="peduncle presence">peduncles present;</span> <span class="statement" id="st-d0_s8" data-properties="bract architecture;bract arrangement or course or shape">bracts reducing acropetally from 2-ternate to simple, linear;</span> <span class="statement" id="st-d0_s9" data-properties="bracteole presence">bracteoles absent.</span> <span class="statement" id="st-d0_s10" data-properties="pedicel presence"><b>Pedicels </b>present.</span> <span class="statement" id="st-d0_s11" data-properties="flower diameter"><b>Flowers </b>3–6 mm diam.;</span> <span class="statement" id="st-d0_s12" data-properties="epicalyx bractlet presence">epicalyx bractlets 0;</span> <span class="statement" id="st-d0_s13" data-properties="hypanthium shape;hypanthium some measurement;hypanthium pubescence;hypanthium pubescence">hypanthium hemispheric, 0.5–1 mm, glabrous or villous;</span> <span class="statement" id="st-d0_s14" data-properties="sepal quantity;sepal orientation;sepal shape">sepals 5, spreading to erect, deltate;</span> <span class="statement" id="st-d0_s15" data-properties="petal quantity;petal coloration;petal shape">petals 5, white, spatulate to obovate;</span> <span class="statement" id="st-d0_s16" data-properties="stamen quantity;stamen height or length or size;filament fusion">stamens 20, shorter than petals, filaments basally connate;</span> <span class="statement" id="st-d0_s17" data-properties="torus size or width;torus shape">torus thickened, 10-lobed;</span> <span class="statement" id="st-d0_s18" data-properties="carpel quantity;carpel fusion;carpel pubescence;style position or structure subtype">carpels (4 or) 5 (or 6), free, adaxially sparsely villous, styles terminal;</span> <span class="statement" id="st-d0_s19" data-properties="ovule quantity">ovules 3–5.</span> <span class="statement" id="st-d0_s20" data-properties="fruit shape;fruit shape;fruit some measurement;fruit pubescence;follicle arrangement;follicle quantity"><b>Fruits </b>aggregated follicles, (4 or) 5 (or 6), falcate, truncated at proximal end, 2–3 mm, sericeous adaxially;</span> <span class="statement" id="st-d0_s21" data-properties="hypanthium duration">hypanthium persistent;</span> <span class="statement" id="st-d0_s22" data-properties="sepal duration;sepal orientation">sepals persistent, spreading to erect;</span> <span class="statement" id="st-d0_s23" data-properties="style duration">styles deciduous.</span> <span class="statement" id="st-d0_s24" data-properties=""><b>Seeds </b>1–4, elongate-fusiform.</span> <span class="statement" id="st-d0_s25" data-properties="seed quantity;seed shape;x chromosome quantity">x = 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://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V9/V9_710.xml |subfamily=Rosaceae subfam. Amygdaloideae |tribe=Rosaceae tribe Spiraeeae |genus=Luetkea |blade shape=lobed;obtrullate |blade some measurement=0.5cm;1.5cm |blade texture=pergamentaceous |bract architecture=2-ternate;simple |bract arrangement or course or shape=linear |bracteole presence=absent |carpel fusion=free |carpel pubescence=villous |carpel quantity=5 |cauline leaf architecture=simple |cauline leaf arrangement=crowded;alternate |epicalyx bractlet presence=absent |filament fusion=connate |flower diameter=3mm;6mm |follicle arrangement=aggregated |follicle quantity=5 |fruit pubescence=sericeous |fruit shape=truncated;falcate |fruit some measurement=2mm;3mm |hypanthium duration=persistent |hypanthium pubescence=villous;glabrous |hypanthium shape=hemispheric |hypanthium some measurement=0.5mm;1mm |inflorescence architecture=5-20(-30)-flowered |inflorescence position or structure subtype=terminal |leaf condition=marcescent |leaf duration=persistent |margin architecture=actinodromous |margin position=suprabasal |margin prominence or shape=flat |ovule quantity=3;5 |pedicel presence=absent |peduncle presence=absent |petal coloration=white |petal quantity=5 |petal shape=spatulate;obovate |petiole architecture=winged |petiole presence=absent |raceme pubescence=glabrescent;villous |seed quantity=1;4 |seed shape=elongate-fusiform |sepal duration=persistent |sepal orientation=spreading;erect |sepal quantity=5 |sepal shape=deltate |stamen height or length or size=shorter |stamen quantity=20 |stem atypical quantity=5;12 |stem growth form or orientation=prostrate |stem pubescence=glabrous |stem quantity=1;5 |style duration=deciduous |style position or structure subtype=terminal |surface pubescence=glabrous |torus shape=10-lobed |torus size or width=thickened |whole_organism architecture=stoloniferous;rhizomatous |whole_organism atypical some measurement=1.5dm;3dm |whole_organism growth form=subshrub;mat-forming |whole_organism some measurement=1dm;1.5dm |x chromosome quantity=9 }}<!-- -->[[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.