Amphibromus scabrivalvis

(Trin.) Swallen
Common names: Rough amphibromus
Treatment appears in FNA Volume 24. Treatment on page 704.
Please click on the illustration for a higher resolution version.
Illustrator: Bee F. Gunn

Copyright: Utah State University

Plants perennial; rhizomatous. Culms 30-100+ cm, terete, erect or decumbent; nodes up to 10, lowest 3 or 4 nodes often underground, aerial nodes usually producing cleistogamous panicles; lowest internodes usually swollen. Leaves mostly cauline; sheaths usually longer than the internodes, smooth; ligules 6-15 mm; lower blades 5-25 (40) cm long, 2-6 mm wide, flat, rather lax; upper blades reduced, sometimes to 1 cm. Cleistogamous panicles with 6-10 mm spikelets bearing 1-3 florets, lemmas unawned, sometimes mucronate, anthers about 0.7 mm. Terminal panicles 6-27 cm, often partially enclosed in the uppermost sheaths; branches 2-8 cm, ascending to drooping, often sinuous; pedicels absent or to 10 mm. Spikelets 12-25 mm, with 3-9 florets. Glumes 1/2 - 2/3 the length of the adjacent lemmas; lower glumes 3.5-6.7 mm, 1-3-veined; upper glumes 5-8 mm, 3-5-veined; lemmas 5-11 mm, 7-9-veined, hispid or tuberculate, deeply bilobed, awned, awns 8-17 mm, arising near midlength; paleas 4-6 mm, chartaceous, margins scabrous to ciliolate distally; anthers 0.7-2 mm. 2n = unknown.

Discussion

Amphibromus scabrivalvis is native to open grasslands of South America. It was discovered growing in strawberry patches in Tangipahoa Parish, Louisiana, in the late 1950s. Despite efforts to eradicate it, the species persists there; it is not known to have spread elsewhere. North American plants belong to Amphibromus scabrivalvis (Trin.) Swallen var. scabrivalvis.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Amphibromus scabrivalvis"
membranous +  and scarious +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
midlength +
Surrey W.L. Jacobs +
(Trin.) Swallen +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
geniculate +
0.8 cm8 mm <br />0.008 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
inrolled +  and flat +
ascending;drooping +
spikelike +
Rough amphibromus +
not branching +
decumbent +  and erect +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
not woody +
pistillate +  and staminate +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
3 +  and 9 +
chasmogamous +  and cleistogamous +
compressed +
reduced +
shorter or longer +
subtending +
1/2 +  and 2/3 +
acute +  and obtuse +
subequal +  and unequal +
uncinate +
0 +  and 1/2 +
awned +  and bilobed +
tuberculate +
mucronate +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
lacerate +  and elongate +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
membranous +
2 (?) +  and ? (?) +
aristate +  and obtuse +
inconspicuous +
not lobed +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
2mm +  and 6mm +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.67 cm6.7 mm <br />0.0067 m <br />) +
shorter and narrower +
scabrous +  and ciliolate +
aerial +  and underground +
concealed +  and prominent +
3 +, 0 +  and 10 +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
cleistogamous +
spikelike +
dry +  and fleshy +
terminating in a reduced floret +  and empty +
usually longer +
1 +  and 60 +
compressed +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Amphibromus scabrivalvis +
Amphibromus +
species +
6 cm60 mm <br />0.06 m <br /> (27 cm270 mm <br />0.27 m <br />) +
membranous +
2 +  and 4 +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
parallel +  and converging +
5 +  and 9 +
aquatic +  and terrestrial +