50 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
@, incisely serrate and spinose; heads subglobose, about 12 mm. 
long, on very short peduncles or sessile; involucre of bracts resem. 
bling the leaves, longer than the head; bractlets lanceolate, entire, 
spinosely tipped; fruit clothed with imbricated pointed scales, less 
than 2mm. long, with ovate long-pointed calyx lobes twice as long, 
and long styles; oil tubes very large, more or less sunken in the some- 
what dorsally flattened seed; seed face plane. 
Type locality, **on the Canadian,” Arkansas; collected by /ames in 
1820; type in Herb. Columbia Uniy. 
Intust.: Marcy’s Report, pl. 
Sandy plains, Arkansas, Oklahoma, Indian Territory, and Texas. 
oblong 
Specimens examined : 
OKLAHOMA: Cheyenne County, Carleton 4o4, August, 1891. 
Inpran Territory: Near Cash Creek, Sheldon 169, July 17, 1891. 
Texas: Nueces River, Berlandier 2508, June, 1834; Baylor County, Reverchon 356, 
September, 1879; Colorado River, Havard, August, 1881; Baird, Letterman 
51, August, 1882; Nealley, in 1888; Gillespie Coun‘y, Jermy 643, 644. 
Eryngium wrightii Gray, Pl. Wright. 1:78. 1852. 
Glaucous; stem erect, branching, 6 to 6 dm. high; leaves rigid; 
basal and lower stem leaves oblanceolate, pectinate-dentate or pinnat- 
ifid with triangular teeth tipped with long bristles; stem leaves ses- 
sile, from laciniately toothed to pinnately cut into linear-lanceolate 
cuspidate segments; heads ovate to oblong, about 12 mm. lone; invo- 
lucre of numerous linear-lanceolate entire to remotely toothed spiny- 
tipped bracts, whitish within, green without, twice as long as the 
head; bractlets subulate, rigid, spiny-tipped, longer than the flowers, 
the terminal one or two very prominent and crowning the head; fr uit 
1mm. long, with short ovate mucronate calyx lobes, and long styles. 
Type locality, **bed of the Limpia or Wild Rose Creek,” Texas; 
collected by Wrght, no. 230, in 1849; type in Herb. Gray, duplicate 
in U. S. Nat. Herb. 
Hills and plains, Texas to Arizona, and extending into Mexico. 
Speciinens examined ; 
Texas: Wright 230, August, 1849; Mex. Bound. Surv. 412; near Dallas, Hall 243, 
June 30, 1872; western Texas, Havard, July, 1883; Chenates region, Nealley 
169, in 1889, 
ARIZONA: Sonoita Valley, altitude 1,950 meters, Hothrock 603, August, 1874; 
Apache Pass, Chirricahua Mountains, Lemmon, August, 1881; northern Ari- 
zona, Lemmon 18, in 1882; near Fort Pluachuca, Wilcow 865, August, 1894. 
16. Eryngium lemmoni C. & R. Bot. Gaz. 14: 279, 1889. 
Glaucous; stem erect, branching above, 3 to 9 dm. high; basal and 
lower stem leaves rigid, elongated oblanceolate, sharply dentate; upper- 
most leaves broadly ovate, more or less deeply cut, the lobes cuspidate- 
tipped; heads short-oblong (8 to 12 mm. long), much surpassed and 
enveloped by the conspicuous involucre of broadly cuneate leaf-like 
cuspidate-toothed and lobed bracts (becoming 8 to LO mm. broad); 
