Panicum trichoides Sw.

• Region

  South America

• Country

  Brazil

• State/Province

  Maranhão

• County/Municipio

  Lorêto Mun.

• Locality

  "Ilha de Balsas" region, between the Rivers Balsas & Parnaíba. Ca. 5 km north of main house of Fazenda "Morros", about 30 km south of Lorêto. One of a series of steepsided peaks about 50 m. tall from base, called "Morros do Caldeirao"

• Elevation

  Alt. 350 m. (1148 ft.)

• Coordinates

  -7.33, -45.07

• Distribution

  Map all specimens of this taxon

FLORA OF BRAZIL
STATE OF MARANHÀO
Panicum trichoides Swartz
(det* J. H.Swallen, 1964)
Municipio de Loreto:	“Ilha de Balsas” region, between the Rios
Balsas and Parnaiba.	Ca. 5 1® N of main house of Fazenda
“Morros”, about 30km.	south of LORfiTO. Alt. ca. SSBO&K 350 m.
ca.7° 20’s., 45% ’W. 2 May 1962
Main vegetation types of region: (1) “chapada”, a semi-closed tree woodland (or
“cerrad&o") on flat tops & steep sides of plateaus, »» »taay MBy iaad, and on
some areas of rolling or flat dry land; (2) “tabulelro”, a seml-closed’ woodland,
or "cerrad&o”, of different physiognomy & species composition, on tops of hilly
or gently rolling land; (3) “mata”, a closed tropical forest of many tree species,
usually with palms, in flat stream valleys and in or alongside of brook ravines &
courses; (4) “caatinga”, a serai-open forest of few forest tree species on low
moist flat land and In narrow valleys between “tabulelro”-covered hills; (5) "var-
j&o”, low moist flat land with scattered forest trees of one or a few species;
(6) “cocal”, thick groves of babacu palm on flat river plain of Rio Parnaiba and
some of Its tributary streams. MJHOvegetatlon types completely deciduous during
dry season. All brooks intermittent. Annual ground fires and cattle grazing in
all areas. Part of “tabulelro” cut over, forming treeless grassy areas; most
“mata” and much "caatinga” & “varjao” cultivated or abandoned, forming dense
secondary vegetation of low trees & tall shrubs ("capoelra”); some areas of
“chapada” with dense secondary vegetation ("carrasco”). Upland soUs grayish
tan, or light reddish brown silt or silty clay, very stony on slopes; lowland soils
mostly reddish brown to black slit loam, silty clay loam or clay loam, without
stones. Country rock horizontal light brown sandstone, exposed only on tops
of morros and on cliffs along the Rio Parnaiba.
This habitat: one of a series of steep-sides peaks
about 50 m. tall from base, called "Morros do
Galdeirao" j this one about 1/2 km n of southernmost
morro of the series. In shade of shrubs among out-
cropping sandstone rocks just below top of morro.
Grass j the separate paints forming a pseudo-clump.
leg. George Eiten and Liene T. Eiten, no. 4494
__(plant 2)
Distributed by the Institute de Bot&nlca, Sao Paulo	—
00864616