View source for Amelanchier nantucketensis

{{Treatment/ID
|accepted_name=Amelanchier nantucketensis
|accepted_authority=E. P. Bicknell
|publications={{Treatment/Publication
|title=Bull. Torrey Bot. Club
|place=38: 453. 1911
|year=1911
}}
|common_names=Nantucket shadbush
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=F
|label=Selected by author to be illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Amelanchier oblongifolia var. micropetala
|authority=B. L. Robinson
}}
|hierarchy=Rosaceae;Rosaceae subfam. Amygdaloideae;Rosaceae tribe Gillenieae;Amelanchier;Amelanchier nantucketensis
|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 Gillenieae]]</div><div class="higher-taxon"><small>genus</small>[[Amelanchier]]</div><div class="higher-taxon"><small>species</small>[[Amelanchier nantucketensis]]</div></div>
|volume=Volume 9
|mention_page=page 649, 656, 661
|treatment_page=page 657
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> 0.3–2.5 m. <b>Stems</b> 1–70, rhizomatous, suckering and forming colonies. <b>Leaves</b> less than half-unfolded; petiole (6–)9–15(–22) mm; blade elliptic to oblanceolate or oblong-elliptic, (11–)29–41(–55) × (13–)19–29(–42) mm, base rounded to cuneate, each margin with 0–4(–10) teeth on proximal 1/2 and (0–)3–8(–12) teeth in distalmost cm, largest teeth less than 1 mm, apex subacute to rounded and mucronate, abaxial surface densely (moderately) hairy by flowering, surfaces sparsely hairy (or glabrous) later. <b>Inflorescences</b> (4–)6–8(–11)-flowered, (12–)24–36(–53) mm. <b>Pedicels</b>: (0 or)1(or 2) subtended by a leaf, proximalmost (4–)7–14(–38) mm. <b>Flowers</b>: sepals irregularly spreading or recurved after flowering, (1.3–)2–3(–3.9) mm; petals spatulate to oblong, (2.2–)3–4.5(–6.8) × (0.6–)1–2(–3) mm, sometimes bearing 1 or 2 tiny pollen sacs near margins on adaxial surfaces; stamens (12–)18–20; styles (4 or)5, (1.7–)2.6–3.7(–4.3) mm; ovary apex glabrous or sparsely to densely hairy. <b>Pomes</b> dark purple-blue, 7.5–10 mm diam. <b>2n</b> = 4x.</span><!--

-->{{Treatment/Body
|phenology=Flowering Mar–May; fruiting Jun–Jul.
|habitat=Fields, sand-plain grasslands, heaths, glacial outwash plains, forest openings, disturbed sites, stream shores, among rocks or sand, dry habitats, ditches, swales
|elevation=0–400 m
|distribution=N.S.;Conn.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;R.I.;S.C.;Va.
|discussion=<p>In the absence of flowering material, identification of Amelanchier nantucketensis is tentative; it is easily confused with A. spicata. K. M. Wiegand (1912) thought that A. nantucketensis originated as a hybrid between A. spicata (which he called A. stolonifera) and A. canadensis (as A. oblongifolia).</p><!--
--><p>Amelanchier nantucketensis can reach 2.5 m but is usually much shorter, with spindly, straight, pale gray stems. Some petals of A. nantucketensis bear 1 or 2 tiny pollen sacs near margins on adaxial surfaces. Petal-borne pollen, which is highly unusual within the plant kingdom, is viable in A. nantucketensis and associated with a unique pollinator guild of native bees (A. C. Dibble et al. 1997). Conservation challenges for this apomictic tetraploid were discussed by Dibble and C. S. Campbell (1995).</p><!--
--><p>Amelanchier nantucketensis has been documented to be self-compatible and able to produce seed asexually (C. S. Campbell et al. 1987).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Amelanchier nantucketensis
|author=
|authority=E. P. Bicknell
|rank=species
|parent rank=genus
|synonyms=Amelanchier oblongifolia var. micropetala
|basionyms=
|family=Rosaceae
|phenology=Flowering Mar–May; fruiting Jun–Jul.
|habitat=Fields, sand-plain grasslands, heaths, glacial outwash plains, forest openings, disturbed sites, stream shores, among rocks or sand, dry habitats, ditches, swales
|elevation=0–400 m
|distribution=N.S.;Conn.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;R.I.;S.C.;Va.
|reference=None
|publication title=Bull. Torrey Bot. Club
|publication year=1911
|special status=Endemic;Selected by author to be illustrated
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V9/V9_1129.xml
|subfamily=Rosaceae subfam. Amygdaloideae
|tribe=Rosaceae tribe Gillenieae
|genus=Amelanchier
|species=Amelanchier nantucketensis
}}<!--

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