HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 41 
plants with papillose-hispid sheaths and blades and contracted panicles; the spikelets 
are 2.8 mm. long. 
Panteumfasciculatumc[hjarthaginense Doell in Mart. Fl. Bras. 22: 205.1877. Based 
on P.chartaginense- Swartz. 
Panicum fasciculatum reticulatum Beal, Grasses N. Amer. 2: 117. 1896. Based on 
P. reticulatum Torr. 
Panicum fuscum reticulatum Scribn. & Merr- 
U.S. Dept. Agr. Div. Agrost. Cire. 32: 4.1901. 
Based on P. reticulatum Torr. The specimen 
here referred to P. chartaginense is P. ramo- 
sum L.@ of Asia. 
DESCRIPTION. 
Differing from P. fasciculatum in having 
smaller, more compact panicles, the branches 
ascending or appressed, narrower blades, 
usually pubescent on both surfaces, and 
spikelets 2.6 to 3 mm. long. 
_ There are many intermediate specimens. The well-marked form is usually smaller, — 
with appressed branches and blades. It occurs in the drier regions of the Mexican 
Plateau. Some specimens, such as Griffiths 1545 and 1616, cited under P. fuscum 
reticulatum by Scribner and Merrill,® are nearly glabrous. 
The following specimens from Texas seem to be intermediate between the species 
and subspecies. They are mostly large plants with rather open panicles and spikelets 
about 3mm. long: Fort Worth, Tracy 8171; Dona, Tracy 8890; College Station, Price 
in 1895; Abilene, Bentley in 1899; Victoria, Plank 74; San Antonio, Havard, Heller 
1698, Jermy 202; Dallas, Reverchon 94; Houston, Thurow 16. 
A closely allied species, P. multiculmum Anders.,¢ from the Galapagos Islands, has 
been referred to P. chartaginense Swartz by Grisebach.@ 
DISTRIBUTION. Coe 
Prairies, fields, and waste ground, Texas and Arizona to Mexico; also in Venezuela 
(Swartz). 
Texas: Uvalde, ebvenolion 1086; Dallas, Bush 1157; Taylor, Ballin 1901; Abi- 
lene, Bentley in 1899; wuaen, Plank 11; Big Sjoritnee, Tracy 8289; Columbia, 
Bush 270; Manor, Hall 825; 
San Antonio, Havard in 1882, 
EMitchcock 162, Jermy 203, Plank 
47; Bexar County, Jermy 22; 
Laredo, Sauvignet in 1892; 
without locality, Nealley in 
1887, Wright 797. 
New Mexico: Socorro, Plank 38. 
Arizona: Tucson, -Giriffiths 1545; 
—T616, 3362, Hitchcock 3495; Prin- 
gle in 1881; Papayo-Reserva- 
tion, Grifiiths 1654; Santa Rita Fig. 22.—Distribution of P, fiseculaige, Pa 
Mountains, Griffiths 7297, 7299. ¢ Nyepl 
Mexico: Gabuetnc: eee 379, 380; San Dieguito, Patnver 162 in 1904: Vic- - 
toria, Palmer 412 in 1907; Guaymas, Hitchcock 3561, Palmer 159 in 1887 in 
part. 
Fic. 21.—P. fasciculatum chartaginense. From 
type specimen. 
a See page 44. ¢ Vet. Akad. Handl. Stockh. 1853: 133. 1855. 
5 Loc. cit. d Fl. Brit. W. Ind. 546. 1864. 
