Cenchrus spinifex
Cenchrus myosuroides
coastal sandbur, common sandbur
big sandbur
30-100 cm, geniculate.
5-200 cm, stout, glaucous.
compressed, glabrous or sparsely pilose;
ligules 0.5-1.4 mm;
blades 3-28 cm long, (1)3-7.2 mm wide, glabrous or sparsely long-pilose adaxially.
from shorter than to equaling the internodes;
ligules 1.5-2(3.4) mm;
blades 12-40 cm long, 4-13 mm wide, glabrous or sparsely pilose adaxially.
3-5(8.5) cm;
fascicles 5.5-10.2 mm long, 2.5-5 mm wide, imbricate, ovoid to globose, glabrous or sparesely to moderately pubescent;
outer bristles, when present, mostly flattened;
inner bristles 8-40 (rarely more), 2-5.8 mm long, 1-2 mm wide, fused at least 1/2 their length, forming a distinct cupule, the distal portions usually diverging from the cupule at multiple, irregular intervals, sometimes diverging at more or less the same level, ciliate at the base, pubescent, stramineous to mauve or purple, flattened.
4-23 cm;
fascicles 3.8-8 mm long, 1.2-2.6 mm wide, composed of several whorls of bristles, not burlike;
bristles 3-5.8 mm long, 0.2-0.6 mm wide, fused only at the base, not forming a cupule, terete, increasing in size inwards, inner bristles pubescent on the lower 1/2 - 2/3.
2-4 per fascicle, 3.5-5.9 mm, glabrous.
1(2-3) per fascicle, 3.8-4.8(5.6) mm.
about 2.5 mm long, 1-2 mm wide, ovoid.
1.5-2.6 mm long, 1-1.5 mm wide, ovoid.
glumes 1-3.3 mm;
upper glumes (2.8)3.5-5 mm, 5-7-veined;
lower florets sometimes staminate;
lower lemmas 3-5(5.9) mm, 5-7-veined;
lower paleas sometimes reduced or absent;
anthers 1.3-1.6 mm;
upper lemmas 3.5-5(5.8) mm;
anthers 0.5-1.2 mm.
glumes 1.5-3 mm;
upper glumes 3-5 mm, 3-5-veined;
lower lemmas 3-5.5 mm;
upper lemmas 3.8-5.4 mm;
anthers 0.8-2.2 mm.
= 34 (32).
= (54), 70.
Cenchrus spinifex
Cenchrus myosuroides
Cenchrus spinifex is common in sandy woods, fields, and waste places throughout the southern United States and southwards into South America. It may be more widespread than shown in the northern portion of the contiguous United States because it has often been confused with C. tribuloides. Cenchrus spinifex differs from C. tribuloides in its glabrous or less densely pubescent fascicles, narrower inner bristles, and larger number of bristles. It has also been confused with C. longispinus but differs in having shorter spikelets, fewer bristles overall, wider inner bristles, and outer bristles that are usually flattened rather than usually terete.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Cenchrus myosuroides is a native species that grows mostly along roadsides and in other waste places. Its native range extends through the Caribbean and Central America to northern South America.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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