Cenchrus brownii Roem. & Schult.

CENCHRUS Linnaeus
Cenchrus hexaflorus Blanco FI. Filip. (1837) 36 (sp. nov.) ; ed. 2 (1845)
X 24; ed. 3, 1 (1877) 46=CENCHRUS ECHINATUS Linn.
This species was reduced by Fernandez-Villar to Pennisetum
resl) MiPennisetum compressufn Rl Br*, while
in my .previous consideration of Blanco’s species I considered it
as certainly the same as Pennisetum macrostacbyum Trin., chiefly
on account of the known distribution of the two species of Pen-
nisetum in the Philippines. However, Blanco’s, description does
not at all apply to Pennisetum, but manifestly does apply to
Cenchrus echinatus Linn.,* a species of wide distribution and
abundant in and about towns in the Philippines. The state-
ment “Los involucros son membranáceos, y muy tiesos, y doblán-
dose algunos hacia dentro, forman una cosa algo semejante a
los abrojes” (abrojes=caltrop) leaves absolutely no doubt as
to the spéciés intended, yet it is difficult to conceive just why*
Blanco described the involucres as membranaceous and at the'
same time as very hard or solid. The species was certainly
introduced into the Philippines from Mexico.
Illustrative specimen from Manila, Luzon, February, 1915
{Merrill: Species Blancocmae No. 811)+
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MJETJÎJÎ ILLI
SPECIES 13LANCOANAE
811* Ce m hr us eoMnatus I, inn.
Qencfrrus liexaflorui Blaaoo
HERBARIUM OF IOWA STATE UNIVERSITY
REVISION OF THE GENUS CENCHRUS
Cenchrus brownii R* & S«
DETERMINED by d.g. delisle
04310830