View source for Tetracoccus

{{Treatment/ID
|accepted_name=Tetracoccus
|accepted_authority=Engelmann ex Parry
|publications={{Treatment/Publication
|title=W. Amer. Sci.
|place=1: 13. 1885
|year=1885
}}
|common_names=Four-pod spurge
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Halliophytum
|authority=I. M. Johnston
|rank=genus
}}
|hierarchy=Picrodendraceae;Tetracoccus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Picrodendraceae]]</div><div class="higher-taxon"><small>genus</small>[[Tetracoccus]]</div></div>
|etymology=Greek tetra, four, and kokkos, kernel or berry, alluding to 4-lobed capsule in T. dioicus
|volume=Volume 12
|mention_page=
|treatment_page=page 326
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> usually dioecious, sparingly hairy to glabrescent, hairs simple. <b>Leaves</b> often clustered on axillary short shoots; blade glabrescent. <b>Inflorescences</b>: staminate paniclelike or racemelike thyrses, or fascicles on short shoots; pistillate fascicles on short shoots or flowers solitary. <b>Pedicels</b> present or absent. <b>Staminate</b> flowers: sepals 4–10, sometimes weakly differentiated in 2 whorls; nectary intrastaminal, lobed; stamens 4–10. <b>Pistillate</b> flowers: sepals 5–13, sometimes differentiated in 2 whorls; nectary lobed. <b>Fruits</b> capsules. <b>Seeds</b> oblong, ovoid, or pyriform, with one flattened radial surface if 2 seeds develop per locule, otherwise both radial surfaces rounded, seed coat dry, smooth or wrinkled near hilum. <b>x</b> = 12.</span><!--

-->{{Treatment/Body
|distribution=sw United States;n Mexico.
|discussion=<p>Species 5 (3 in the flora).</p><!--
--><p>In addition to the three species treated for the flora area, <i>Tetracoccus</i> includes two Mexican species, T. capensis (I. M. Johnston) Croizat from the extreme tip of Baja California Sur and T. fasciculatus (S. Watson) Croizat from the Chihuahuan Desert.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaves alternate and clustered on short shoots, blades 2–12 mm; staminate flowers in fascicles on short shoots; filaments glabrous; pistillate pedicels 1–3 mm; pistils usually 3-carpellate; seeds 1(–2) per locule, both radial surfaces usually rounded.
|[[Tetracoccus hallii|Tetracoccus hallii]]
|-id=key-0-1
|1
|Leaves whorled, opposite, or subopposite, not clustered on short shoots, blades 15–30 mm; staminate flowers in paniclelike or racemelike thyrses; filaments villous basally; pistillate pedicels 6–15 mm; pistils usually 4-carpellate; seeds (1–)2 per locule, usually with one flattened radial surface.
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Leaf blades ovate to broadly elliptic, margins prominently serrate-dentate; staminate inflorescences congested paniclelike thyrses; pistillate sepals 8, in 2 series, greenish.
|[[Tetracoccus ilicifolius|Tetracoccus ilicifolius]]
|-id=key-0-2
|2
|Leaf blades oblong or oblanceolate to linear, margins entire or remotely serrulate; staminate inflorescences sparingly branched racemelike thyrses; pistillate sepals 7–13, in 1 series, red.
|[[Tetracoccus dioicus|Tetracoccus dioicus]]
|}
</div></div><!--

-->{{#Taxon:
name=Tetracoccus
|author=W. John Hayden
|authority=Engelmann ex Parry
|rank=genus
|parent rank=family
|synonyms=Halliophytum
|basionyms=
|family=Picrodendraceae
|distribution=sw United States;n Mexico.
|reference=None
|publication title=W. Amer. Sci.
|publication year=1885
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V12/V12_211.xml
|genus=Tetracoccus
}}<!--

-->[[Category:Treatment]][[Category:Picrodendraceae]]