Panicum rudgei Roem. & Schult.

• Region

  South America

• Country

  Brazil

• State/Province

  Mato Grosso

• County/Municipio

  Barra do Garças Mun.

• Locality

  Serra do Roncador. 255 km along new road NNE of village of Xavantina. (3.5 km due S of Royal Society- Royal Geographic Society Base Camp. At "airstrip campo"

• Elevation

  Alt. 450 m. (1476 ft.)

• Coordinates

  -12.85, -51.75

• Distribution

  Map all specimens of this taxon

Panicum
FLORA OF BRAZIL
STATE OF MATO GROSSO
SERRA DO RONCADOR
NEW YORK BOTANICAL GARDEN
00864460
UNITED STATES NATIONAL HERBARIUM
/"IS
• o.
Municipio de Barra do Garga?: 255 km along new road NNE of
village of XAVANTINA. (	fim due S of Royal Society-
Royal Geographic Society Base Camp. Base Camp is at 12°51’S. 51°45’W )
Alt. ca. 450 m. At "airstrip campo". 3 Sept 1968
(Area of 10 km radius around Base Camp Is situated on crest of the Serra do
Roncador, a gently-sloped divide between Xingu drainage (via Rio Suii mi™?
to west and AraguSia drainage (via Rio das Mortes) to east. The vet undis«pi.tort
few-km wide crest is flat or gently rolling with a few low lateritic scarns smS
ridges. Brook valleys with very gentle to moderately steep slopes Base S
area is exactly at climatic boundary between Amazonian forest region and central
Brazil “cerrado” region (savanna sens. lat.). North-western half of area is covS
with the outer edge of the continuous Amazonian forest, here a slie-ht.lv aemMZ
ciduous dry mesophytic forest 15-18 m tall on the upland, taller a Inn »tv,«
seasonally dry brooks. Southeastern half of area has, on the upland xeromnrnhin
semideciduous cerrado, in the form , of medium-tall open scrub or tree-anri srWK
woodland, with evergreen gallery forests 20-30 m tall along the permanent brooks
Usually a band of seasonally marshy grassy campo, a few meters to a few S
of meters wide, borders the gallery forests, separating them from the cerrado
but where the campo is lacking, the cerrado grades directly into eallerv
through a narrow band of its arboreal form, “cerradSo”. The camnos nlnX
have scattered circular groves of cerrado scrub several meters in diameter on
slightly raised soil, each with a termite mound. On the upland the cerrado rwrini!
grades into the continuous dry forest region through a few-km wide ecoton? n#
cerradSo. Underlying rock is various kinds of sandstone, giving rise to
clayey fine-sandy deep latosols, sterile and reddish or yellowish-tan with
no humus on upland under cerrado, and dark red with more clav imd«- niS
forest. In restricted areas under cerrado, small laterite blocks or quarto DebbEX
may form a thin permeable subsurface layer, or the upper son laver	hf
purely of laterite pebbles. Valley soils are deep light gray fine sand with Htt^
or no clay, sterile on drier upper slopes, black with humus in upper laver rm
moister or soaking lower slopes and floors. Shales underlie soils In a few vaL™
At this date the Base Camp region has not yet been settled; the forests
the cerrado and campo are uncut and ungrazed, but have been suhiontlrt Z. g
fires set by Indians every 3-5 yearsTln the ceralo? Xse^requenf«re«
temporarily reduce density of the lower shrubs but otherwise have no effpn?
on the physiognomy.)	.nave no effect
Habitat of this n.°:
grassy- campo*
This nfi: dense stand, 1 m tall clumps.
disturbad roadside throagh a natural
leg. George Eiten & Liene T. Eiten, n.° 8560
Distributed by the Instituto de Botanica, SSo Paulo
00864460