View source for Ammannia

{{Treatment/ID
|accepted_name=Ammannia
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=1: 119. 1753
|year=1753
}}
|common_names=Toothcup;redstem
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Hionanthera
|authority=A. Fernandes & Diniz
|rank=genus
}} {{Treatment/ID/Synonym
|name=Nesaea
|authority=Commerson ex Kunth
|rank=genus
}}
|hierarchy=Lythraceae;Ammannia
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Lythraceae]]</div><div class="higher-taxon"><small>genus</small>[[Ammannia]]</div></div>
|etymology=For Paul Ammann, 1634–1691, Professor of Botany at Leipzig
|volume=Volume 10
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual or perennial, terrestrial or amphibious [aquatic], 1–10 dm, glabrous [puberulent]. <b>Stems</b> erect or trailing, glaucous or not throughout, branched or unbranched, anthocyanic in age, submerged stems sometimes thickened by aerenchymatous spongy tissue. <b>Leaves</b> opposite [subopposite or whorled]; sessile; blade linear, linear-lanceolate, oblong, linear-oblong, lanceolate, elliptic, or spatulate [ovate], base cordate or auriculate [attenuate]. <b>Inflorescences</b> indeterminate, axillary, simple or compound cymes or solitary flowers [racemes or capitula]. <b>Flowers</b> sessile, subsessile, or pedicellate, actinomorphic, monostylous [di- or tristylous]; floral tube perigynous, campanulate or urceolate, semiglobose to globose in fruit, often 8–12[–16]-ribbed; epicalyx segments shorter than or as long as sepals [longer than or absent]; sepals 4–6[–8], to 1/4 floral tube length; petals caducous [persistent], (0–)4–8, deep rose purple, pale pink, white, or pale lavender, sometimes with rose purple midvein or basal spot, obovate to suborbiculate; nectariferous tissue present at ovary-floral tube junction; stamens 4–12(–14)[–27]; ovary incompletely (1 or)2–5-locular; placenta globose [elongate]; style slender and well-exserted or stout and included; stigma capitate or punctiform. <b>Fruits</b> capsules, walls thin and dry, indehiscent, splitting irregularly at maturity or initially circumscissile then splitting irregularly. <b>Seeds</b> [2–]100+, obovoid to semiglobose, concave-convex, 0.3–0.4 × 0.3–0.5 mm; cotyledons ± complanate.</span><!--

-->{{Treatment/Body
|distribution=North America;Mexico;West Indies;Central America;South America;Europe;Asia;Africa;Pacific Islands;Australia;worldwide in temperate to subtropical and tropical areas.
|discussion=<p>Species ca. 80 (5 in the flora).</p><!--
--><p>Ammannia was expanded from ca. 25 species to ca. 80 with the inclusion of Hionanthera and Nesaea following multi-gene molecular phylogenetic evidence that the genera form a monophyly (S. A. Graham et al. 2011). Africa is the center of diversity for the genus.</p><!--
--><p>Ammannia frequently grows with the closely similar Rotala ramosior. In the flora area, the auriculate leaf bases of Ammannia expediently separate it from Rotala; leaf bases are tapered in R. ramosior.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Styles stout, 0.5 mm, included; petals 0–4(–6).
|[[Ammannia latifolia|Ammannia latifolia]]
|-id=key-0-1
|1
|Styles slender, 1.5–9 mm, exserted; petals 4–6(–8).
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Inflorescences solitary flowers; peduncles 7–19 mm; petals 6, 4–7 mm; stigmas punctiform.
|[[Ammannia grayi|Ammannia grayi]]
|-id=key-0-2
|2
|Inflorescences simple or compound cymes (flowers sometimes solitary at proximalmost and distalmost nodes); peduncles 0–9 mm; petals 4(–8), 1.5–3 mm; stigmas capitate.
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Cymes 1–3(–5)-flowered mid stem; petals pale lavender, sometimes with rose purple midvein or rose purple basal spot; anthers light yellow.
|[[Ammannia robusta|Ammannia robusta]]
|-id=key-0-3
|3
|Cymes (1–)3–15-flowered mid stem; petals deep rose purple, sometimes with darker rose purple basal spot; anthers deep yellow.
|[[#key-0-4| > 4]]
|-id=key-0-4
|4
|Peduncles slender (nearly filiform); cymes (3–)7–15-flowered mid stem; capsules (1–)1.5–2.5(–3.5) mm diam.
|[[Ammannia auriculata|Ammannia auriculata]]
|-id=key-0-4
|4
|Peduncles stout; cymes (1–)3–7(–15)-flowered mid stem; capsules 3.5–5 mm diam.
|[[Ammannia coccinea|Ammannia coccinea]]
|}
</div></div><!--

-->{{#Taxon:
name=Ammannia
|author=Shirley A. Graham
|authority=Linnaeus
|rank=genus
|parent rank=family
|synonyms=Hionanthera;Nesaea
|basionyms=
|family=Lythraceae
|distribution=North America;Mexico;West Indies;Central America;South America;Europe;Asia;Africa;Pacific Islands;Australia;worldwide in temperate to subtropical and tropical areas.
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=
|source xml=https://xjsachs2@bitbucket.org/aafc-mbb/fna-data-curation.git/src/1f4bf54ae2f7dbd5376c45b4fe1b388e15b53086/coarse_grained_fna_xml/V10/V10_516.xml
|genus=Ammannia
}}<!--

-->[[Category:Treatment]][[Category:Lythraceae]]