Tragus berteronianus
spike bur grass, spike burr grass
(2)3.5-45 cm.
(1)2-13 cm long, (3)4-8 mm wide;
rachises pubescent;
branches (0.5)0.7-2.7 mm, pubescent, with 2(3) spikelets, axes occasionally extending past the distal spikelets;
proximal internodes 0.2-0.6(0.7) mm, shorter than the second internodes.
(0.9)1.2-2 mm long, 0.4-0.8 mm wide.
0.5-1 mm;
blades (0.5)0.7-8.5 cm long, 1.2-5 mm wide, glabrous.
spikelets (1.8)2^.3 mm;
second spikelets (0.8)1-3.9 mm, sometimes sterile.
glumes 0.1-0.6 mm, membranous, minutely pubescent;
upper glumes 1.8-4.3 mm, minutely pubescent, 5-veined, rarely with 1-2 additional veins adjacent to the midvein;
glume projections (4)6-14, in 5 rows, (0.2)0.3-1 mm, uncinate;
lemmas (1.5)1.8-3.1 mm, sparsely pubescent on the back, midveins occasionally excurrent to 0.6 mm;
paleas (1.3)1.5-2.4 mm;
anthers 3, 0.4-0.6 mm, yellow, occasionally purple-or green-tinged.
= 20.
Tragus berteronianus
Tragus berteronianus is native to Africa and Asia, and is now established in Arizona, New Mexico, and Texas. It was collected in Maine, Massachusetts, New York, and Virginia in the nineteenth century, and Virginia in 1959.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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