HITCHCOCK—MEXICAN GRASSES. 3538 
97. OPIZIA Presl, Rel. Haenk. 1: 293. pl. 41. f. 1. 1830. 
1. Opizia stolonifera Presl, Rel. Haenk. 1: 293. pl. 41. f. 1. 1830. 
Type locality, ‘“‘Acapulco.’’ 
RANGE: Southern Mexico and Cuba. 
HERBARIUM SPECIMENS FROM Mexico: 
Jatisco: Guadalajara, Palmer 615 in 1886. Tequila, thin, gravelly soil, Pringle 
4566. 
Cotima: Coquimatlan, along railway, Hitchcock 7052. 
PUEBLA: Atlixco, Nelson in 1893. 
MoreELos: Yautepec, roadside, Pringle 11237. Cuernavaca, open ground, 
Hitchcock 6817; roadside, where trodden, Hitchcock 6842. 
GUERRERO: Acapulco, Palmer 42 in 1894. Balsas, along railway, Hitchcock 6783, 
6804. Apipilulco, prairie, Hitchcock 6771. 
Oaxaca: Oaxaca, base of hill, Hitchcock 6097. Tomellin, Rose, Painter & Rose, 
10051, 10052; open ground along track, Hitchcock 6239. 
98. PRINGLEOCHLOA Scribn. Bot. Gaz, 21: 137. pl. 13. 1896. 
1. Pringleochloa stolonifera Scribn. Bot. Gaz. 21: 138. pl. 13. 1896. 
Type locality, ‘“‘calcareous plains around Tehuacan in eastern Puebla,’’ the type 
specimen collected by Pringle (no. 6280). 
RaneeE: Known only from the type locality. 
HERBARIUM SPECIMENS: 
Puesia: Tehuacan, dry plains, Pringle 6280; calcareous soil, Pringle 9560; Rose & 
Rose 11440; old field, Hitchcock 6036; open sterile soil among cactus, Hitch- 
cock 6071. 
99. PAPPOPHORUM Schreb. Gen. Pl. 2: 787. 1791. 
KEY TO THE SPECIES. 
Nodes bearded; culms decumbent, spreading; panicle spike-like, 
lead-colored.... 22.22.22. 22.22 e cece cece eee eee L. P. wrightii. 
Nodes glabrous; culm erect, panicle tawny. 
Body of lemma | to 2 mm. long, the longer awns as much as 
lcm. long; panicle rather loose, 30 to 50 cm. long. ..... 3. P. laguroideum. 
Body of lemma 3 to 4 mm. long, the longer awn about 5 mm. 
1) 0 2. P. vaginatum. 
1. Pappophorum wrightii 8. Wats. Proc. Amer. Acad. 18: 178. 1883. 
Type locality, ‘‘Llano Estacado, in deep ravines,’’ Texas. 
RanGE: Southwestern United States to Bolivia. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower Cauirornia: Los Angeles Bay, Gulf of California, Palmer 511 in 1887. 
Calmallf, common on rocky slope, Orcutt in 1899. 
Sonora: Guaymas, Palmer 511 in 1887. Hermosillo, rocky cliff, Hitchcock 3608. 
CummuanHua: Chihuahua, mesa, Mitchcock 7801; rocky hills, Pringle 483. 
Duranco: Durango, rocky hill, Iron Mountain, Hitchcock 7638; Palmer 721 in 
1896. Torreén, rocky hill, Hitchcock 7542. 
CoaHUILA: Saltillo, among rocks on hillsides, Palmer 395 in 1898. Parras, Palmer 
1361 in 1880. 
Saw Luis Potosi: San Luis Potosf, Parry & Palmer 947 in 1878. 
QUERETARO: Querétaro, rocky hill, Hitchcock 5847. 
Hipatco: Tula, dry calcareous bluffs, Pringle 11238. 
Puesia: Tehuacan, sterile soil, among cactus, Hitchcock 6070. 
Oaxaca: Monte Alban, thin soil of limestone ledges, Pringle 4846. Oaxaca, 
rocky hill, Hitchcock 6144. 
