Difference between revisions of "Pennisetum polystachion"

(L.) Schult.
Common names: Mission grass
Introduced
Treatment appears in FNA Volume 25.
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|publications=
 
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|common_names=Mission grass
 
|common_names=Mission grass
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|special_status={{Treatment/ID/Special_status
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|code=I
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}}
 
|basionyms=
 
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|distribution=Puerto Rico;Tex.;Fla.;Pacific Islands (Hawaii)
 
|distribution=Puerto Rico;Tex.;Fla.;Pacific Islands (Hawaii)
|discussion=<p>Pennisetum polystachion is a polymorphic, weedy African species that has become established in the tropics and subtropics, including Florida. The U.S. Department of Agriculture considers it a noxious weed. Only Pennisetum polystachion subsp. setosum (Sw.) Brunken has been found in the Flora region. It differs from P. polystachion (L.) Schutt. subsp. polystachion as indicated:</p>
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|discussion=<p><i>Pennisetum polystachion</i> is a polymorphic, weedy African species that has become established in the tropics and subtropics, including Florida. The U.S. Department of Agriculture considers it a noxious weed. Only <i>Pennisetum polystachion</i> subsp. setosum (Sw.) Brunken has been found in the Flora region. It differs from <i>P. polystachion</i> (L.) Schutt. subsp. polystachion as indicated:</p>
 
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name=Pennisetum polystachion
 
name=Pennisetum polystachion
|author=
 
 
|authority=(L.) Schult.
 
|authority=(L.) Schult.
 
|rank=species
 
|rank=species
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|basionyms=
 
|basionyms=
 
|family=Poaceae
 
|family=Poaceae
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|illustrator=Linda A. Vorobik
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|illustration copyright=Utah State University
 
|distribution=Puerto Rico;Tex.;Fla.;Pacific Islands (Hawaii)
 
|distribution=Puerto Rico;Tex.;Fla.;Pacific Islands (Hawaii)
 
|reference=None
 
|reference=None
 
|publication title=
 
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|publication year=
 
|publication year=
|special status=
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|special status=Introduced
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V25/V25_1360.xml
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|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/200273ad09963decb8fc72550212de541d86569d/coarse_grained_fna_xml/V25/V25_1360.xml
 
|subfamily=Poaceae subfam. Panicoideae
 
|subfamily=Poaceae subfam. Panicoideae
 
|tribe=Poaceae tribe Paniceae
 
|tribe=Poaceae tribe Paniceae

Latest revision as of 17:56, 11 May 2021

Plants annual or perennial; cespitose from a hard, knotty base. Culms 30-200 cm, erect, branching; nodes glabrous. Sheaths glabrous, margins ciliate; ligules 1.5-2.7 mm; blades 15-55 cm long, 4-18 mm wide, flat, glabrous or pubescent. Panicles terminal, 10-25 cm long, 15-30 mm wide, fully exerted from the sheaths, erect to drooping, white, yellow, light brown, or pink to deep purple; rachises terete, scabrous. Fascicles 33-45 per cm, disarticulating at maturity; fascicles axes 0.2-0.5 mm, with 1 spikelet; outer bristles 13-30, 1.3-5 mm, scabrous; inner bristles 6-14, 4.3-11.5 mm, long ciliate; primary bristles 14-25 mm, long-ciliate, noticeably longer than the other bristles. Spikelets 3-4.5 mm, sessile; lower glumes absent or to 2 mm, veinless; upper glumes 3-4.5 mm, glabrous, 5-7-veined, 3-lobed; lower florets sterile or staminate; lower lemmas 3-3.9 mm, 5-7-veined, apices lobed; lower paleas 2.9-3.7 mm; anthers absent or 1.7-2 mm; upper florets disarticulating at maturity; upper lemmas 1.7-3 mm, coriaceous, shiny, 5-veined, apices ciliate; anthers 1.3-2.1 mm. Caryopses about 1.7 mm, concealed by the lemma and palea at maturity. 2n = 18, 36, 45, 48, 52, 53, 54, 56, 78.

Distribution

Puerto Rico, Tex., Fla., Pacific Islands (Hawaii)

Discussion

Pennisetum polystachion is a polymorphic, weedy African species that has become established in the tropics and subtropics, including Florida. The U.S. Department of Agriculture considers it a noxious weed. Only Pennisetum polystachion subsp. setosum (Sw.) Brunken has been found in the Flora region. It differs from P. polystachion (L.) Schutt. subsp. polystachion as indicated:

Selected References

None.

Lower Taxa

None.

Key

1 Plants annual, usually profusely branching; fascicles white, pink, red, or deep purple Pennisetum polystachion subsp. polystachion
1 Plants perennial, usually sparingly branched; fascicles yellow, light brown, or purplish Pennisetum polystachion subsp. setosum