488 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
40. Panicum ichnanthoides Fourn. 
Panicum ichnanthoides Fourn. Mex. Pl. 2: 30. 1886; Contr. U. 8S. Nat. Herb. 15: 88. 
1910, as synonym under P. virgatum. The type specimen, Miiller 2002, in the her- 
barium of the Botanical Garden in St. Petersburg, was collected at Orizaba. 
Panicum buchingeri Fourn. Mex. Pl. 2: 30. 1886. ‘‘Orizaba (Thomas in herb. 
Buchinger).”’ Contr. U. 8, Nat. Herb. 15: 329: 1910. We have been unable to find 
the type. From the description it is evident that the species is allied to P. virgatum 
L., while the locality would indicate P. ichnanthoides. 
DESCRIPTION. 
Plants in large clumps with knotted crowns, without creeping rootstocks; culms 
1.5 to 2 meters high, erect or decumbent at base, smooth, firm, and hard, more or less 
glaucous about the nodes; sheaths shorter than the inter- 
nodes, pubescent on the overlapping margin toward the 
apex, otherwise glabrous; liguleabout 3 mm. long, mem- 
branaceous-ciliate; blades elongate, mostly 8 to 15 mm, 
wide, flat except at the narrowed and usually inrolled 
base, scabrous on the margins, villous on the upper 
surface near the base, otherwise glabrous; panicle 20 
to 40 cm. long, one-fourth to one-third as wide, the 
long slender branches ascending; spikelets 3.5 to 4.2 
mm. long, about 1.5 mm. wide, similar to those of 
P. virgatum. 
This species is closely allied to P. virgatum I., from 
which it differs in the absence of creeping rootstocks 
and in the narrow panicle. The patch of plants from 
which was collected Hitchcock’s no. 6364 is probably 
that from which Botteri, Miller, and Thomas obtained their specimens. This patch 
lies along a trail leading up a prominent hill at the western edge of the city of 
Orizaba, a locality likely to be visited by all botanists collecting in that region. 
Fia, 55.—P. ichnanthoides. 
From type specimen. 
DISTRIBUTION. 
Open rocky hillsides, southern Mex- 
ico, British Honduras, and Nicaragua. 
Puesia: Tehuacdn, Endlich 1938. 
Veracruz: Orizaba, Botteri 648, 
Hitchcock 6364, Miiller 2002. 
British Honpuras: Manatee La- 
goon, Peck 73 (Gray Herb.). 
Nicaraaua: Jinotepe, Hitchcock 
8685. Fic. 56.—Distribution of P. ichnanthoides. 
‘41. Panicum altum sp. nov. 
DESCRIPTION. 
Plants perennial, in tangled masses, the culms decumbent and straggling at base 
stout, reedlike, as much as 6 mm. in diameter, ascending to a height of 2 to 4 meters, 
smooth and glaucous, simple or with extravaginal, mostly erect, sterile branches from 
the swollen nodes; sheaths smooth; ligule a short membrane less than 1 mm. long, the 
ciliate fringe once or twice as long; blades flat, firm, not greatly elongated, mostly 30 
to 45 cm. long, 8 to 15 mm. wide, smooth except the scabrous margins, panicles rather 
more densely flowered than in P. virgatum, 20 to 30 cm. long, narrowly ovoid in out- 
