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
}}{{Treatment/ID/Synonym
|name=Hypericum sect. Elodea
|authority=Choisy
}}
|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 Triadenum were reviewed by N. K. B. Robson (1977). B. R. Ruhfel et al. (2011) concluded from molecular studies that Triadenum is part of Hypericum. Robson (2012) gave reasons why Triadenum 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
|author=
|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://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V6/V6_181.xml
|genus=Triadenum
}}<!--

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