Tragus heptaneuron

Clayton
Common names: Seven-veined burgrass
Treatment appears in FNA Volume 25. Treatment on page 281.

Plants annual. Culms 15-41cm. Ligules 0.5-1 mm; blades 2.5-7 cm long, 3-5 mm wide, glabrous. Panicles 4-9.5 cm long, 7-9 mm wide; rachises pubescent; branches 0.5-1 mm, pubescent, with 2 (3) spikelets, axes not extending past the distal spikelets; proximal internodes 0.5-0.8 mm, longer than the second internodes. Spikelets bisexual; proximal spikelets 3-3.5 mm; second spikelets 2.9-3.3 mm. Lower glumes absent or to 0.4 mm, glabrous; upper glumes 3-3.5 mm, minutely pubescent, 7-veined; glume projections 6-9, in 7 rows, 0.1-0.6 (1) mm, uncinate; lemmas (2) 2.3-2.7 mm, sparsely pubescent on the back; paleas 2.1-2.3 mm; anthers 3, 0.3-0.6 mm, yellow. Caryopses (1.2) 1.4-1.6 mm long, 0.6 mm wide. 2n = unknown.

Distribution

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S.C.

Discussion

Tragus heptaneuron is native to tropical Africa, but it has been collected in Florence County, South Carolina.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Tragus heptaneuron"
0.03 cm0.3 mm <br />3.0e-4 m <br /> - 0.06 cm0.6 mm <br />6.0e-4 m <br /> +
J.K. Wipff +
Clayton +
1 - ? +  and 3 - ? +
multiple +, , +  and single +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
2.5 cm25 mm <br />0.025 m <br /> - 7 cm70 mm <br />0.07 m <br /> +
usually linear +  and lanceolate occasionally ovate +
0.3 cm3 mm <br />0.003 m <br /> - 0.5 cm5 mm <br />0.005 m <br /> +
spikelike +
0.05 cm0.5 mm <br />5.0e-4 m <br /> - 0.1 cm1 mm <br />0.001 m <br /> +
0.14 cm1.4 mm <br />0.0014 m <br /> - 0.16 cm1.6 mm <br />0.0016 m <br /> +
0.6 cm6 mm <br />0.006 m <br /> - ? +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Seven-veined burgrass +
ascending +  and erect +
15 cm150 mm <br />0.15 m <br /> - 41 cm410 mm <br />0.41 m <br /> +
not woody +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
bisexual +  and fertile +
round +  and compressed +
reduced +
shorter or longer +
subtending +
0.01 cm0.1 mm <br />1.0e-4 m <br /> - 0.06 cm0.6 mm <br />6.0e-4 m <br /> +
unequal +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
not absent +
0.23 cm2.3 mm <br />0.0023 m <br /> - 0.27 cm2.7 mm <br />0.0027 m <br /> +
sometimes longer +
0.05 cm0.5 mm <br />5.0e-4 m <br /> - 0.1 cm1 mm <br />0.001 m <br /> +
membranous +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
0.21 cm2.1 mm <br />0.0021 m <br /> - 0.23 cm2.3 mm <br />0.0023 m <br /> +
membranous +
4cm +  and 9.5cm +
cylindrical +
0.7 cm7 mm <br />0.007 m <br /> - 0.9 cm9 mm <br />0.009 m <br /> +
dry +  and fleshy +
spinelike +  and uncinate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> - 0.08 cm0.8 mm <br />8.0e-4 m <br /> +
0.3 cm3 mm <br />0.003 m <br /> - 0.35 cm3.5 mm <br />0.0035 m <br /> +
spikelike +
compressed +
0.29 cm2.9 mm <br />0.0029 m <br /> - 0.33 cm3.3 mm <br />0.0033 m <br /> +
1 +  and 3 +
compound +  and simple +
2 - ? +  and 3 - ? +
Gramineae +
Tragus heptaneuron +
species +
membranous +
0.3 cm3 mm <br />0.003 m <br /> - 0.35 cm3.5 mm <br />0.0035 m <br /> +
7 - ? +  and 13 - ? +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +