CATALOGUE. 245 



recognized by its glaucous color and whitish stipules and white append- 

 ages. In Arizona it is called " Rattlesnake-weed ", as its acrid juice is con- 

 sidered an antidote against the venom of that reptile. In Mexico, to this, 

 as well as to other allied species, known under the name of Golondrina, 

 great medicinal virtues are ascribed. 



Euphorbia (Anisophyllum) flagelliformis, Engelm. in Hayden's 

 Bull. Geol. and Geog. Surv. Terr. 2, No. 3, 243. E. petaloidea, var. 

 flagelliformis, Engelm. in Bot. Mex. Bound. 185. E. zygophylloides, var. 

 flagelliformis, Engelm. in Boiss. 1. c. 29 — A glabrous annual, with prostrate 

 or ascending branches a span to a foot long ; linear or oblong-linear entire 

 leaves, acutish at both ends, 4-6" long, 1" wide ; conspicuous triangular 

 incised stipules and alternate loose-flowered leafy corymbs ; involucres 

 broadly campanulate, with 2-4 large, concave, narrow-margined or inap- 

 pendiculate glands ; broad triangular capsule; smooth gray seeds thick 

 and short, triangular, acute. — Camp Goodwin, Gila Valley, Arizona, Roth- 

 rock (339), 1874. Apparently a common plant in the sandy valleys of the 

 Rio Grande (Wright, Brandegee) and Gila, but very rarely collected. Dr. 

 Rothrock's specimens have a ligneous, very stout, tapering root 3" in diam- 

 eter, with many stems (1-1 £" thick) from the neck, just as we sometimes see 

 other annual Anisophylla, E. hypericifolia among them, so that they simulate 

 and actually become perennials ; real perennials, however, such as the 

 next species, have cylindric or tuberous roots, usually with slender and 

 even filiform bases to the stems, which are buried beneath the surface. 

 The slender leaves and the short, leafy, alternate flowering branchlets, much 

 shorter than the internodes of the elongated stems, characterize this species 

 at once. Like the Californian E. ocellata, it is distinguished by large cup- 

 shaped glands, usually less than four in number, and scarcely or not at 

 all margined. 



Euphorbia (Anisopyiillum) Fendleri, Torr. & Gray, Pacif. R. R. 

 Rep. 2, 175; Bot. Mex. Bound. 186; Boiss. I. c. 38; E. nqncola, Scheele, 

 not Boiss.— Glabrous; many suberect or ascending, short, rigid stems of a 

 finger's length from a perennial root ; thick leaves, obliquely triangular- 

 ovate to lanceolate, 1-2V' long, entire, often reddish ; stipules subulate or 

 somewhat lanceolate; involucres in terminal and lateral leafy cy mules; 



