276 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
HERBARIUM SPECIMENS FROM Mexico—Continued. 
Cummuanua: Sanchez, rocky pine woods, Hitchcock 7671. Mifiaca, rocky hill, 
Mitchcock 7763. Santa Eulalia Mountains, Pringle 386; Wilkinson 4, 343. 
Sierra Madre, Nelson 6496a. 
Durango: Durango, rocky hill, Hitchcock 7588. 
ZACATECAS: Plateado; Rose 2793. 
Jautisco: Rfo Blanco, Palmer 769 and 769a in 1886. 
Hipat@o: Pachuca, rocky hill, Hitchcock 6752. 
MicnoacAn: Urudpan, prairie, Hitchcock 6975. 
México: Popo Park, edge of woods, Hitchcock 5971. Federal District, Orcutt 3732. 
Pursia: Esperanza, rocky hill, Hitchcock 6480. Cerro de Chicamole, Purpus 
4218. San Marcos, railway embankment, Hitchcock 6526, 6539. Chalchico- 
mula, rocky hill, Hitchcock 6273, 6299. . Without locality, Purpus 4221. 
MoreE.os: Alarcén, Orcutt 3863. 
Oaxaca: Sierra de San Felipe, Conzatti & Gonzdlez 439. Near Reyes, Nelson 
1807. 
3. Aristida purpusiana sp. nov. 
Perennial; culms erect, slender, rigid, glabrous, 50 to 60 cm. high, the branches 
stiffly ascending; sheaths glabrous, pilose at the throat; blades 1 to 2 mm. wide, 5 to 
10 cm. long, becoming involute; panicle narrowly pyramidal, 15 to 25 cm. long; 
branches few, short, few-flowered, finally spreading or reflexed, the lower 5 to 6 cm. 
long, the branchlets and pedicels stiffly ascending; glumes somewhat unequal, the 
lower about 6 mm., the upper 8 mm. long, smooth, 1-nerved, slightly notched at the 
apex; lemma conspicuously pilose at the base, about 1 cm. long to base of awns, 
straight, minutely scabrous on the short beak; lateral awns scarcely 1 mm. long; 
terminal awn about 8 mm. long, recurved by a semicircular bend. 
Type in the U. 8. National Herbarium, no. 470407, collected at San José del Cabo, 
Lower California, Mexico, in 1901, by C. A. Purpus (no. 394). 
The only other specimen observed was collected at the same place in 1890 by 
T. S. Brandegee. 
4. Aristida scabra (H. B. K.) Kunth, Rév. Gram. 1: 62. 1829. 
Streptachne scabra H. B. K. Nov. Gen. & Sp. 1: 124. pl. 40. 1816. 
Type locality, ‘‘in frigidis montanis regni Mexicani juxta Tolucca et Islahuaca.” 
RanGE: Southern United States, Mexico and West Indies to Panama. 
HERBARIUM SPECIMENS FROM MBxIco: 
Lower Ca.iFrorniA: Benorama (Cape Region), Brandegee in 1899. San José del 
Cabo, Brandegee in 1890 and 1899. San Francisquito Mountains, Brandegee 
in 1890. 
Sonora: Alamos, Palmer 702 in 1890. Hermosillo, dry soil, Hitchcock 3537; 
meadow near river, Hitchcock 3596; rocky cliff, Hitchcock 3603. Guaymas, 
Palmer 55 and 268 in 1887; rocky lava hill, Hitchcock 3545; dry hills, Rose, 
Standley & Russell 12607. 
CHIHUAHUA: Santa Eulalia Plains, Wilkinson in 1885. Southwestern Chihuahua, 
Palmer 115 and 161 in 1885. Rocky hills near Chihuahua, Pringle 387, 
Hitchcock 7789. 
Srnaoa: Culiacién, Rose, Standley & Russell 14986. Fuerte, dry hills, Rose, 
Standley & Russell 13511. Lodiego, common in mountains, Palmer 1653 in 
1891. 
DuraneGo: Santiago Papasquiaro, Palmer 472 in 1896. 
San Luis Porosi: Las Palmas, limestone hills, Pringle 3776. 
Jatisco: San Nicol4s, sterile clay hill, Hitchcock 7209; Bolafios, Rose 3694. 
Guanajuato: Irapuato, dry shrubby hill, Hitchcock 7428. 
