1904] BRIEFER ARTICLES 221 
**Involucral bracts greenish or stramineous below, conspicuously tipped with 
chestnut-brown, pectinate-fimbriate with 8-12 pairs of lateral rather slender teeth. 
C. Rothrockii Greenman, n. sp. Annual or biennial (?), 3-10™ 
high: stem erect, simple below, sparingly branched above, sulcate- 
Striate, glabrous or slightly hirtellous; leaves lanceolate to oblong- 
lanceolate, 3-12 long, 1-3.5™ broad, sessile and often semiamplex- 
icaul, acuminate, acute, sometimes terminated by a conspicuous mucro, 
entire to slightly sinuate-dentate, hirtellous-puberulent on both sur- 
faces, hispidulous on the margins, resiniferous-dotted ; the uppermost 
leaves much reduced and not infrequently subfimbriate near the tip: 
peduncles thickened above: heads large, 3-5°" high, including the 
rays 3-15 in diameter: involucre subcampanulate, in well-developed 
specitnens about 3™ high and 4™ broad; bracts of the involucre 
about 9-seriate, rather closely imbricated, lanceolate, pectinate-fimbriate 
in the upper third, bearing 8-12 pairs of brownish ciliated rather 
slender teeth: the neutral marginal flowers (rays) elongated, conspicu- 
ous, usually purple, much exceeding the lemon-yellow flowers of the 
disk: mature achenes oblong-obovate, 5™" long, black and smooth.— 
C. americana Rothrock in Wheeler’s Report 180. 1878, not Nutt.— 
Centaurea sp. Engelm. in Wislizenus Report 107. 1848, Reprint 23. 
Unitep Srates. Arizona: Chiricahua, Rothrock, no. 527 (type). 
Mexico. Chihuahua: near Colonia Garcia, altitude 2300”, August 9, 
1899, Zownsend & Barber, no. 247: August 1-20, 1899, £. W. Nelson, 
no. 6175; southeastern Chihuahua, August-November 1885, Dr. 
Ldward Palmer, no. 415; Llanos, Dr. Wislizenus. Durango: Sierra 
Madre, 18.5*" north of Guaucevi, altitude 2460-2770", August 18, 
1898, £. W. Nelson, no. 4774. Zacatecas: between Bolafios and Guad- 
alajara, September 20, 1897, Dr. J. NV. Rose, no. 3033. Oaxaca: La 
Mixteca, Huauclilla, District of Nochixtlan, altitude 2000”, June 26, 
1898, F. Lopez (Conzatti & Gonzdlez, no. 781). 
These two species are among the most attractive of the genus; 
both are well worthy of garden cultivation. C. Rothrockit is equal, if 
not superior, to its sister species C. americana, which has already found 
its way to many American gardens. The writer takes pleasure in dedi- 
cating the handsome species here described to Dr. Joseph Trimble 
Rothrock, now of the State Forestry Commission of Pennsylvania. 
II. ON THE GENUS ASPILIOPSIS, 
In the “Supplementary leaflet’”’ to the Contributions from the Gray 
Herbarium of Harvard University new series, no. xxv, issued September 
