HITCHCOCK AND CHASE—-NORTH AMERICAN PANICUM. 83 
rowly ovate, more finely transversely rugose than in P. maximum, the bluntly pointed 
apex puberulent. 
The type specimen of P. bulbosum represents the medium form of this species, 
which varies much in height, width of blades, and size of spikelets. Numerous 
specimens intermediate between this and the subspecies sciaphilum occur; that is, 
with the larger spikelets and narrower blades or smaller spikelets and wider blades. 
DISTRIBUTION. 
Moist places in canyons and valleys of the Rocky and Sierra Madre mountains, New 
Mexico and Arizona to southern Mexico, 
New Mexico: Animas Valley, Mearns 2501; Black Range, Metcalfe 1422; Mangas, 
Metcalfe 80 in part; Burro Mountains, Rusby 445b; Las Vegas, Vasey in 1881; 
White Mounains, Wooton 368; 
Organ Mountains, Standley in 
1906. 
Arizona: Chiricahui Mountains, 
Toumey in 1896; Rincon Moun- 
tains, Nealley in 1891; Hua- 
chuca Mountains, //olzner 1966, 
2079, 2163, Lemmon 2912, 2914, 
2916; Santa Catalina Moun- 
tains, Griffiths 7083; Walnut 
Canyon, MacDougal 336; Bar- 
foot Park, Blumer 1341; with- Fig. 72.—Distribution of P. bulbosum. 
out locality, Rusby in 1883. 
Mexico: Chihuahua, Hartman 790, Pringle 377, Nelson 6187, 6301; Sierra Madres, 
Townsend & Barber 221; San Luis Potosi, Parry & Palmer 958; Durango, 
Palmer 525a in 1896; Otinapa, Palmer 340 in 1906; Tejamen, Palmer 469 in 
1906 in part; Rio Blanco, Palmer 207 in part and 207a in 1886; Puebla, Purpus 
2908; Eslava, Holway 12, Pringle 9575; Valley of Toluca, Pringle 5207 (Hitch- 
cock Herb.); State of Jalisco, Rose 2609; Valley of Mexico, Bourgeau 235, 
Pringle 6418; Territorio de Tepic, Rose 1999, 3361; Chinantla, Liebmann 441, 
442; Mount Orizaba, Bourgeau 2794, Seaton 317; Oaxaca, Conzattt & Gonzales 
243, Nelson 1374. 
41a. Panicum bulbosum sciaphilum (Rupr.). 
Panicum sciaphilum Rupr.; Fourn. Mex. Pl. 2:19, 1886. This name was listed with- 
Fic. 73.—P. bulbosum sciaphilum. 
From type specimen. 
out description by Ruprecht,¢ “Col. H. Galfeotti] 
no. 5759 * * * Yavezia’’ being cited, and 
also by Hemsley. Fournier cites ‘‘Sierra de 
Yavesia, 7,000’ (Gat[gorri] n. 5759 in herb. Brux. 
et Mus. Par.)”’ The type specimen is in the Brus- 
sels Herbarium. 
. Panicum bulbosum minor[us] Vasey, U. 8. Dept. 
Aer. Div. Bot. Bull. 8: 38. 1889. ‘‘(P. maximum, 
var. bulbosum, Munro)” is cited and range is given 
as ‘‘Texas, New Mexico, and Arizona.’’ Wright’s 
no. 2086 of the Mexican Boundary Survey in the 
National Herbarium marked ‘‘Panicum maximum 
Jacq. var. bulbosum Trin. (fide Munro)” is taken 
as the type, since this is doubtless the basis of Vasey’s 
understanding of Munro’s use of the name cited. This combination was earlier¢ 
listed without description by Vasey. 
a Bull. Acad. Roy. Belg. 92: 240. 1842. eGrasses U.S. 11. 1883. 
b Biol, Centr. Amer, Bot, 3: 496, 1885, 
