76 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
panicles rather long-exserted, those of the branches short-exserted or slightly included 
at base, 7 to 20cm. long, usually scarcely half as wide, the fiexuous branches ascending, 
bearing short, rather spreading branchlets with 1 to 3 spikelets toward their ends, the 
whole forming a more evenly flowered panicle than in P. hallii; spikelets 4 to 4.2 mm. 
long, about 1.5 mm. wide, narrowly ovate, 
turgid, acuminate; first glume about half 
the length of the spikelet, acuminate, 5- 
nerved, the midnerve scabrous toward the 
apex; second glume and_ sterile lemma 
strongly 7 to 9-nerved, the midnerves scab- 
rous toward the apex; fruit 2.3 to 2.5 mm. 
long, 1.3 to 1.5 mm. wide, oval, turgid, 
obtuse. 
Type U. S. National Herbarium no. 
155168, collected September 22, 1885, by 
streams, rocky hills near Chihuahua, State 
of Chihuahua, Mexico, by C. G. Pringle 
(no. 497), and distributed as P. diffusum 
Swartz. 
This species is distinguished from P. 
hallii by the more evenly flowered, narrower panicle of larger spikelets, and by the 
greater amount of pubescence, The plants average taller than P. hailii, though Pal- 
mer 533 is a depauperate specimen only 15 em. high. 
A specimen from Santa Catalina Mountains, Arizona, Grifiths 7063, with spikelets 
only 3.8 mm. long, is doubtfully referred here. 
Fig. 64.—P.lepidulum. From type specimen. 
DISTRIBUTION. 
Moist places in the mountains, Chihuahua to the City of Mexico. 
Mexico: Chihuahua, Pringle 497; Durango, Palmer 525 in 1896, 533 in 1906; City 
of Mexico, Hitchcock 5958. 
37. Panicum ghiesbreghtii Iourn. 
Panicum gliesbreghtii Fourn. Mex. Pl. 2: 29. 1886. This name was earlier listed 
by Hemsley@ without description. Fournier cites three specimens, the first being 
“Absque loco (GurestreGHT),’’ which, since the species is named for this collector, 
is taken as the type. This isin the Paris Herbarium. It was collected in Mexico in 
1845. A specimen collected by Ghiesbreght in Mexico 
and labeled P. ghiesbreghtti in the herbarium of the 
Botanical Garden in St. Petersburg, is P. filipes. 
Panicum hirtivaginum Hitche. Contr. Nat. Herb. 12: 
223. 1909. ‘‘Type specimen Wright 758, Cuba, U. S. 
National Herbarium no. 559958.’ The label on this 
specimen gives no locality in Cuba, 
DESCRIPTION. 
Plants in small tufts, rather robust; culms erect, pa- 
pillose, ascending-hirsute, 60 to 80 cm. high, the nodes 
densely hirsute; sheaths mostly longer than the inter- 
. , : Fig. 65.—P. ghiesbreghtii. From 
nodes, hirsute like the culms; ligules about 2 mm. type specimen. 
long; blades erect or ascending, as much as 60 cm. 
long and 12 mm, wide, flat, not narrowed to the rounded base, papillose-hirsute 
on both surfaces or glabrescent; panicle short-exserted, nearly equaled by the 
@ Biol. Centr. Amer. Bot. 8: 489. 1885. 
