Cenchrus echinatus
Cenchrus brownii
burgrass, common sandbur, field sandbur, konpeito-gusa, sandburr, se mbulabula, southern sandbur, vao tui tui
green sandbur, slimbristle sandbur
20-100 cm, ascending from a geniculate base.
25-100 cm, erect or decumbent.
from shorter than to equaling the internodes, compressed;
ligules 0.7-1.7 mm;
blades 4-18(35) cm long, 2-10(14.2) mm wide, adaxial surfaces sparsely pilose, hairs papillose-based.
slightly compressed;
ligules 0.6-1.3 mm;
blades 6-30 cm long, 0.4-1.1 cm wide, adaxial surfaces glabrous or sparsely pilose.
2.5-12 cm;
rachis internodes 2-4 mm;
fascicles 5-10 mm long, 3.5-6(6.3) mm wide, imbricate;
outer bristles 10-20, terete, the majority no more than 1/2 as long as the inner bristles;
inner bristles 2-5 mm long, 0.6-1.5 mm wide, flattened, not grooved, mostly erect, fused for at least 1/2 their length into a globose cupule, sometimes interlocking at maturity, shortly pubescent, often purple at maturity.
4-15 cm;
rachis internodes 0.8-1.7 mm;
fascicles 5-8 mm long, 2-A.5 mm wide, imbricate, globose, villous at the base, tawny;
outer bristles 5-25, the majority equaling or slightly exceeding the inner bristles but narrower and terete, arising in a whorl at the base of the fascicles;
inner bristles 4-10, 2-4 mm long, 0.6-1.8 mm wide at the base, flattened, not grooved, erect or interlocking at maturity, fused for 1/3 their length or more, forming a globose cupule.
2-3(4) per fascicle, 4.8-7 mm.
2-3 per fascicle, 3-6 mm.
ovoid, 1.2-3.2 mm long, 1.3-2.2 mm wide.
1.9-2.6 mm long, 0.8-1.9 mm wide, ovoid.
glumes 1.3-3.4 mm;
upper glumes 3.8-5.7 mm, 3-7-veined;
lower lemmas 4.5-6.5 mm;
upper florets 4.7-7 mm;
anthers 0.8-2.4 mm.
glumes 0.5-2.5 mm;
upper glumes 2.2-4.9 mm, 3-5-veined;
lower lemmas 3-5.5 mm;
upper florets 3.6-5.4 mm;
anthers 0.8-2.3 mm.
= (34), 68.
= 34.
Cenchrus echinatus
Cenchrus brownii
Cenchrus echinatus grows in disturbed areas throughout the coastal plain and piedmont of the southern United States, Mexico, Central and South America, and, as an unwelcome introduction, elsewhere.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Cenchrus brownii is native to sandy waste places and forest borders. It occurs infrequently on the coastal plain of the southeastern United States, but is common through the Caribbean, Central America, and the northern coast of South America. It has also been introduced to other parts of the world. The record from Texas may represent an introduction; only one specimen is known from the state.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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