Difference between revisions of "Echinochloa oplismenoides"

(E. Fourn.) Hitchc.
Common names: Chihuahuan barnyard grass
Treatment appears in FNA Volume 25. Treatment on page 398.
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|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V25/V25_1117.xml
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|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/200273ad09963decb8fc72550212de541d86569d/coarse_grained_fna_xml/V25/V25_1117.xml
 
|subfamily=Poaceae subfam. Panicoideae
 
|subfamily=Poaceae subfam. Panicoideae
 
|tribe=Poaceae tribe Paniceae
 
|tribe=Poaceae tribe Paniceae

Latest revision as of 17:55, 11 May 2021

Plants annual. Culms to 100 cm, erect, succulent, glabrous, branching from the lower nodes. Sheaths glabrous or hispid with papillose-based hairs; ligules absent or the ligule region pubescent; blades 10-35 cm long, 5-10 mm wide. Panicles 15-30 cm, narrow; primary branches appressed to ascending, with papillose-based hairs at the base of the spikelets. Spikelets 4-5 mm, disarticulating at maturity. Glumes with hairs over the veins, glabrous, scabrous, or hispid between the veins; upper glumes about equal to the spikelets, muticous or awned, awns to 1 mm; lower florets sterile; lower lemmas unawned or awned, awns 8-16(50) mm; lower paleas absent or hyaline and subequal to the lemmas; upper lemmas 4-4.5 mm long, 1.7-1.9 mm wide, elliptic; anthers 0.5-0.7 mm, purple. Caryopses 2.7-2.9 mm long, 1.7-1.8 mm wide, elliptic in outline, mucronate; embryos about 75% as long as the caryopses; hila obovate. 2n = unknown.

Discussion

Echinochloa oplismenoides was first found in the United States, in southern Arizona, in 1993 (Fishbein 1995). It was previously known only from Mexico, with a range that extends from northwestern Mexico to Guatemala. The southern Arizonan plants were found near a cattle tank in wet grasslands. Fishbein stated that it was impossible to tell whether they represented a previously overlooked native species or an introduction.

Selected References

None.

Lower Taxa

None.