HITCHCOCK—-MEXICAN GRASSES. 379 
Type locality,e‘‘Mexico (Chihuahua),”’ the type specimen collected by Pringle 
(no. 1438). 
RANGE: Mountains of Chihuahua and Durango. 
HERBARIUM SPECIMENS: 
CHIHUAHUA: Sierra Madre, moist canyons, Pringle 1438. 
Duranco: Durango, Rose 2358. 
6a. Festuca ovina callosa Piper, subsp. nov. 
Densely tufted, the 2 or 3-jointed culms 50 to 70cm. long, much exceeding the leaves, 
the persistent sheaths of the latter becoming explanate; blades filiform, pale green, 
minutely scaberulous but nearly smooth to the touch, closely involute, 12 to 20 cm. 
long, much longer than the sheaths, bearing on each side at the junction of the sheath 
a prominent callosity; ligule short; panicle narrow, 8 to 12 cm. long, the short slender 
rays in 2’s; spikelets ovate-oblong, purplish, glaucous, 5 or 6-flowered, 7 to 12 mm. 
long; lemma acute, not awned; palea bidentate. 
Type in U.S. National Herbarium, no. 691783, collected on a rocky hill at 2,500 
meters altitude, Esperanza, Puebla, Mexico, August 28, 1910, by A. 8. Hitchcock 
(no. 6490). 
In bearing callosities at the base of the leaf blades this plant resembles Festuca ovina 
calligera Piper and in its explanate leaf sheaths, F. ovina arizonica (Vasey) Hack., but 
in other characters it is quite distinct from either. 
Range: Known only from the type locality, a second specimen, Hitchcock no. 6472, 
having been collected at the same place. 
7. Festuca hephaestophila Nees in Steud. Syn. Pl. Glum. 1: 310. 1854. 
Type locality, ‘‘In cratero montis ignivomi: Volcan de Agua Mexico.” 
Rance: High mountains of southern Mexico. 
HERBARIUM SPECIMENS: 
México: Nevado de Toluca, bottom of crater, Pringle 4221. Ixtaccihuatl, rocky 
soil, Purpus 228. Cima, Orcutt 3775. 
Puesia: Mount Orizaba, Rose & Hay 5768; rocky slopes, alpine region, Purpus 
3015; Liebmann 509; Ross 1272, 1283; Pringle 8588; bald hills, Hitchcock 6255; 
bunches in open ground, Hitchcock 6260; Rose & Hay 5774. Santa Barbara, 
Nicolas in 1910. 
8. Festuca tolucensis H. B. K. Nov. Gen. & Sp. 1: 153. 1816. 
Type locality, ‘‘in montosis, scopulosis, apricis regni Mexicani, inter Islahuaca et 
Toluca.” 
RanGE: Mountains of Mexico. 
HERBARIUM SPECIMENS: 
CurauaHuA: Mount Mohinora, Nelson 4900. 
San Luis Potosi: San Luis Potosi, Parry & Palmer 924 in 1878. 
Jattsco: Nevado de Colima, pine woods, the dominant grass above timber line, 
Hitchcock 7158; above timber line, at its maximum development, Hitchcock 
7167; at summit, Hitchcock 71654; Ross 498. 
México: Popocatepetl, Rose & Hay 5978a, 6297; overhanging bank, open ground, . 
Hitchcock 6001. Tres Marias, Orcutt 3743, 3748. Nevado de Toluca, Rose & 
Painter 7983; Nelson 14. Cima, Oreutt 3773. 
Puesia: Mount Orizaba, open pine woods, Hitchcock 6256; large bunches, Hitch, 
cock 6267; Seaton 193; sandy plains, Seaton 228; Rose & Hay 5697, 5735; 
Liebmann 510, 511; alpine region, Ross 1276. 
9. Festuca rosei Piper, Contr. U. 8. Nat. Herb. 10: 45. 1906. 
Type locality, ‘“‘near Cima, State of Mexico,’’ the type specimen collected by 
Rose & Painter (no. 7210). 
RanGeE: Known only from the type collection. 
