View source for Hypericum gymnanthum

{{Treatment/ID
|accepted_name=Hypericum gymnanthum
|accepted_authority=Engelmann & A. Gray
|publications={{Treatment/Publication
|title=Boston J. Nat. Hist.
|place=5: 212. 1845
|year=1845
}}
|common_names=Small-flowered St. John’s wort
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Hypericum canadense var. cardiophyllum
|authority=R. Keller
}}{{Treatment/ID/Synonym
|name=H. mutilum var. gymnanthum
|authority=(Engelmann & A. Gray) A. Gray
}}{{Treatment/ID/Synonym
|name=Sarothra gymnantha
|authority=(Engelmann & A. Gray) Y. Kimura
}}
|hierarchy=Hypericaceae;Hypericum;Hypericum sect. Brathys;Hypericum gymnanthum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Hypericaceae]]</div><div class="higher-taxon"><small>genus</small>[[Hypericum]]</div><div class="higher-taxon"><small>section</small>[[Hypericum sect. Brathys]]</div><div class="higher-taxon"><small>species</small>[[Hypericum gymnanthum]]</div></div>
|volume=Volume 6
|mention_page=page 89
|treatment_page=page 93
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs </b>annual, usually erect, sometimes shortly decumbent and rooting, basal branches none, rarely with 1–3(–6) pairs of narrowly ascending branches distally, 0.6–7 dm. <b>Stems</b>: internodes 4-angled. <b>Leaves</b> spreading, sessile or amplexicaul; blade usually ovate-triangular to broadly ovate, rarely oblong (mid and distal blades lanceolate-deltate), 5–25 × 3–12 mm, papery to membranous, margins plane, apex usually subacute, basal veins (3–)5, midrib usually with 1–2 pairs of branches. <b>Inflorescences</b> laxly corymbiform to cylindric, (1–)5–65-flowered, branching mostly dichasial. <b>Flowers</b> 4.5–7 mm diam.; sepals lanceolate to narrowly ovate, equal, 3–5 × 0.8–1.2 mm, margins sometimes ciliate, not setulose-ciliate, apex acute to acuminate; petals bright yellow, oblanceolate, 2–4 mm; stamens 10–14, scarcely grouped; styles 0.5–0.7 mm; stigmas broadly capitate. <b>Capsules</b> narrowly conic-ellipsoid, 3–5 × 1.5–2 mm, usually broadest at or near middle. <b>Seeds</b> 0.5–0.6 mm; testa finely linear-scalariform. <b>2n</b> = 16.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer (Jun–Sep).
|habitat=Bogs, ditches, open and cleared woods, damp habitats
|elevation=0–400 m
|distribution=Ala.;Ark.;Del.;Fla.;Ga.;Ill.;Ind.;La.;Md.;Miss.;Mo.;N.J.;N.C.;Ohio;Pa.;S.C.;Tenn.;Tex.;Va.;Central America (Guatemala);introduced Atlantic Islands (Azores).
|discussion=<p>Hypericum gymnanthum was introduced into Poland; it is now extinct there. It is closely related to H. mutilum; it differs from that species in the broader, usually deltate leaves; fewer, stricter branches; no condensed apical stem internode; and larger flowers with lanceolate to ovate sepals.</p><!--
--><p>Hybrids of Hypericum gymnanthum with H. mutilum have been reported from Maryland, Mississippi, North Carolina, Tennessee, and West Virginia, and, perhaps erroneously, with H. canadense from Virginia.</p><!--
--><p>Hypericum gymnanthum has clearly been introduced (recently?) into the Azores, not necessarily by man. Seeds may well have been carried there by birds.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Hypericum gymnanthum
|author=
|authority=Engelmann & A. Gray
|rank=species
|parent rank=section
|synonyms=Hypericum canadense var. cardiophyllum;H. mutilum var. gymnanthum;Sarothra gymnantha
|basionyms=
|family=Hypericaceae
|phenology=Flowering summer (Jun–Sep).
|habitat=Bogs, ditches, open and cleared woods, damp habitats
|elevation=0–400 m
|distribution=Ala.;Ark.;Del.;Fla.;Ga.;Ill.;Ind.;La.;Md.;Miss.;Mo.;N.J.;N.C.;Ohio;Pa.;S.C.;Tenn.;Tex.;Va.;Central America (Guatemala);introduced Atlantic Islands (Azores).
|reference=None
|publication title=Boston J. Nat. Hist.
|publication year=1845
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V6/V6_157.xml
|genus=Hypericum
|section=Hypericum sect. Brathys
|species=Hypericum gymnanthum
}}<!--

-->[[Category:Treatment]][[Category:Hypericum sect. Brathys]]