HITCHCOCK AND CHASE — NORTH AMERICAN PANICUM. 



83 



Fig. 72.— Distribution of P. bulbosum. 



rowly ovate, more finely transversely rugose than in P. maximum, the bluntly pointed 

 apex puberulent. 



The type specimen o1 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, Wboton 368; 

 Organ Mountains, Standley in 

 1906. 



Arizona: Chiricahui Mountains, 

 Tourney in 1896; Rincon Moun- 

 tains, Nealley in 1891; Hua- 

 chuca Mountains, Holzner 1966, 

 2079, 2163, Lemmon 2912, 2914, 

 2916; Santa Catalina Moun- 

 tains, Griffiths 7083; Walnut 

 Canyon, MacDougal 336; Bar- 

 foot Park, Blumer 1341; with- 

 out locality, Rusby in 1883. 



Mexico: Chihuahua, Eartman 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, Pur pus 

 2908; Eslava, Eolway 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, Conzatti & Gonzales 

 243, Nelson 1374. 



41a. Panicum bulbosum sciaphilum (Rupr.). 



Panicum sciaphilum, Rupr. ; Fourn. Mex. PI. 2 : 19. 1886. This name was listed with- 

 out description by Ruprecht,« "Col. H. Galfeotti] 

 no. 5759 * * * Yavezia" being cited, and 

 also by Hemsley.^ Fournier cites "Sierra de 

 Yavesia, 7,000 / (Gal[eotti] n. 5759 in herb. Brux. 

 et Mus. Par.)" The type specimen is in the Brus- 

 sels Herbarium. 



Panicum bulbosum minor[us] Vasey, U. S. Dept. 

 Agr. Div. Bot. Bull. 8: 38. 1889. "(P. maximum, 

 var. bulbosum, Munro) " is cited and range is given 

 as "Texas, New Mexico, and Arizona." Weight'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 c 



listed without description by Vasey. 



Fig. 73.— P. bulbosum sciaphilum. 

 From type specimen. 



a Bull. Acad. Roy. Belg. 9 2 : 240. 1842. 

 b Biol. Centr. Amer. Bot. 3 : 496. 1885. 



c Grasses U. S. 11. 1883. 



