View source for Triadenum

{{Treatment/ID
|accepted_name=Triadenum
|accepted_authority=Rafinesque
|publications={{Treatment/Publication
|title=Fl. Tellur.
|place=3: 78. 1837
|year=1837
}}
|common_names=Marsh St. John’s wort
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Gardenia
|authority=Colden
|rank=genus
}} {{Treatment/ID/Synonym
|name=Hypericum sect. Elodea
|authority=Choisy
|rank=section
}}
|hierarchy=Hypericaceae;Triadenum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Hypericaceae]]</div><div class="higher-taxon"><small>genus</small>[[Triadenum]]</div></div>
|etymology=Greek tri- , three-, and aden, gland, alluding to staminodal glands alternating with sets of stamens
|volume=Volume 6
|mention_page=page 71, 72, 103, 105
|treatment_page=page 102
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial, rhizomatous, glabrous, with glandular canals, lacunae, or dots containing essential oils (pale) in various parts and, sometimes, reddish to purplish gland dots containing hypericin on stems and leaves. <b>Stems</b>: internodes with 2 or 4 raised lines at first, then terete (not lined). <b>Leaves</b> sessile, subsessile, or petiolate; blade relatively broad, venation pinnate, tertiary veins densely reticulate, glands punctiform, pale (records of black gland dots are probably all due to fungal attack), intramarginal and laminar. <b>Inflorescences</b> terminal, sometimes also axillary, cymose, 2–15-flowered, or solitary flower, branching dichasial; bracts and bracteoles relatively small. <b>Flowers</b> tubular or campanulate at first, expanding to stellate for short time each day; sepals persistent, 5, distinct or almost so, margins not glandular-ciliate; petals deciduous, 5, partly imbricate or contorted, pink or flesh-colored, sometimes green-tinged; stamens persistent, 9, in 3 fascicles, each with 3 stamens; filaments of each fascicle 1/5–1/2+ connate; anthers yellow, isodiametric to oblate or shortly oblong, with amber gland on connective; staminode fascicles 3, alternating with stamen fascicles; ovary 3-merous; placentation axile; ovules relatively numerous on each placenta; styles distinct, spreading. <b>Capsules</b> 3-valved, with glandular vittae. <b>Seeds</b> narrowly cylindric, carinate; testa reticulate-foveolate. <b>x</b> = 19.</span><!--

-->{{Treatment/Body
|distribution=e North America;Asia (e China;India [Assam];Japan;Korea;e Siberia;Taiwan).
|discussion=<p>Nomenclatural complexities and confusions associated with <i>Triadenum</i> were reviewed by N. K. B. Robson (1977). B. R. Ruhfel et al. (2011) concluded from molecular studies that <i>Triadenum</i> is part of <i>Hypericum</i>. Robson (2012) gave reasons why <i>Triadenum</i> is generically distinct.</p><!--
--><p>Species 6 (4 in the flora).</p>
|tables=
|references={{Treatment/Reference
|id=gleason1947a
|text=Gleason, H. A. 1947. Notes on some American plants: Triadenum. Phytologia 2: 288–291.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaves petiolate.
|[[Triadenum walteri|Triadenum walteri]]
|-id=key-0-1
|1
|Leaves sessile or (distal) subsessile
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Leaves: gland dots intramarginal.
|[[Triadenum tubulosum|Triadenum tubulosum]]
|-id=key-0-2
|2
|Leaves: gland dots laminar and intramarginal
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Sepals 4–7(–8) mm, apex acute to acuminate; styles 2–3.5 mm.
|[[Triadenum virginicum|Triadenum virginicum]]
|-id=key-0-3
|3
|Sepals 2.5–5 mm, apex usually obtuse to rounded, rarely acute; styles 0.5–1.5 mm.
|[[Triadenum fraseri|Triadenum fraseri]]
|}
</div></div><!--

-->{{#Taxon:
name=Triadenum
|authority=Rafinesque
|rank=genus
|parent rank=family
|synonyms=Gardenia;Hypericum sect. Elodea
|basionyms=
|family=Hypericaceae
|distribution=e North America;Asia (e China;India [Assam];Japan;Korea;e Siberia;Taiwan).
|reference=gleason1947a
|publication title=Fl. Tellur.
|publication year=1837
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V6/V6_181.xml
|genus=Triadenum
}}<!--

-->[[Category:Treatment]][[Category:Hypericaceae]]