174 Contributions from the Gray Herbarium 
near city of Durango, 1890 m., 1896, Palmer 664 (B. M., G., Mo., 
U.S.: in some specimens approaching f. latiorifolia), 665 (B. M., 
G., K., Mo., U. 8.), 748 (B. M., G., K., Mo., U. 8.), 917 (B. M., 
G., K., Mo., U. S.); between Cerro Prieto and La Providencia, 
1898, E. W. Nelson 4980 (U. S.); Zacatecas: Plateado, 1897, 
Rose 2768 (U. S.: toward var. acutior); San Luis Porost: 1830- 
2440 m., 1878, Parry & Palmer 454 (G., K., Mo.), 455 (B. M., G., 
Mo., U. 8.); sandy mountains near Morales, 1876, Schaffner 339 
(G., U.S.); Bagre, Minas de San Rafael, 1911, Purpus 5154 (B. M., 
Mo., U. S.); Hipaueo: rocky soil near Pachuca, 1905, Purpus | 
1540 (B. M., G., Mo., U.S.); mesas near Metepec Station, 2530 m., 
1904, Pringle 13090 (G., U. 8.); Micnoacan: Patzcuaro, 1895, 
C. & E. Seler 1213 (G.); Morelia, 1909 and 1910, Arséne (G., U.5.); 
Srats or Mexico: San Angelo, Berlandier 924 (B. M., Mo.); 
near Tacubaja, 1854, Schaffner (G., K.); Chapultepec, 1865, Bili- 
mek 535 (G., K., U. 8.); Pedregal, 1865-66, Bourgeau 849 (K.); 
Valley of Tolucca, Berlandier 1203 (B. M.); hills of Santa Fe, 
1865, Bourgeau 847 (G., U. 8.); Valley of Mexico, Schaffner 187 
(K.), 291 (G.); Guadalupe, 1903, Rose & Painter 7294 (U. 8.); 
GuanasuatTo: Alaman (Prod.), Bonpland (trpE of H. squarrosus: 
Par.); Queretaro: Née (Prod.); Pursia: near San Luis Tultit- 
lanapa, 1908, Purpus 2592 (B. M., G., Mo., U. 8.). Mexico 
without definite locality: Regla, C. Ehrenberg 461 (G.); plains 
near Hacienda d’Ysapia, Ghiesbreght 370 (G.); 1846, Baztes (G.); 
Schiede 1565 (U. 8.). — Flowering July-Nov. —T. 2. Fic. 33. 
Forma latiorifolia: foliis anguste oblongis vel ovali-oblongis vix 
revolutis manifeste 3-nerviis 2.5-5.7 em. longis 6-12 mm. latis; 
eeterum ut apud formam typicam.— MEXICO: CurnuaHva: 
hills and plains near Chihuahua, 25 Sept. 1886, Pringle 756 (TYPE 
couu.: B. M.,G., K., Mo., U.S.); Durango: near Durango, 1896, 
Palmer 480 (B. M., G., K., Mo., U.S.), 666 (B. M., G., K., Mo. 
U.S8.). 
Var. acutior: involucri phyllariis apice appendicibus herbacels 
lanceolatis vel oblongo-lanceolatis acutis vel acuminatis praeditis; 
ceterum ut apud formam typicam. — MEXICO: QUuERETARO: 
stony hillside, near San Juan del Rio, 1905, Rose, Painter, & Rose 
9545 (G.); Hacienda Ciervo, near Cadereyta, 1905, Rose, Painter; 
& Rose 9657 (G.); Svate or Mexico: Rio Hondo Canyon, 1900, 
Pringle 9086 (G., Mo., U.S.; toward f. typica); Guadalupe, 1865, 
