OF ARTS AND SCIENCES. 253 



or coarsely few-toothed, 1 to 3 inches long : umbels naked, the rays 

 very unequal and somewhat scabrous: fruit small (about 1^ lines 

 long) ; dorsal ribs prominent ; oil-tubes solitary or the lateral in 

 pairs. — Rabbit Valley, S. Utah ; collected by L. F. Ward on Col. J. 

 W. Powell's Exploring Expedition. Distinguished from our only 

 other narrow-leaved species (A. lineariloha, Gray) by the very much 

 shorter fruit. 



MiRABiLis Greenei. Very stout, with the habit of M. multijlora, 

 somewhat glandular-puberulent : leaves rather thick, ovate, acute, 

 attenuate to a short stout petiole, 3 inches long: involucre 7— 10-flow- 

 ered, acutely lobed, 1 to 1^ inches long : perianth tubular-funnel form, 

 a half longer than the involucre, greenish purple : fruit ovate-oblong, 

 usually abruptly contracted near the base, rather strongly 5-angled, 

 the sides somewhat ridged longitudinally and more or less tuberculate, 

 3 lines long or more. — On mountain sides about Yreka, California; 

 in flower and fruit, June, 1876; Rev. E. L. Greene. The fruit ap- 

 proaches that of an Oxyhaphus. 



Abronia micrantha, Torrey, Frem. Rep. 96, and Marcy's Rep. 

 t. 18 (as A. cycloptera). Prostrate : peduncles shorter than the petioles : 

 flowers small and inconspicuous, 3 or 4 lines long, reddish green, the 

 limb scarcely 2 lines broad : fruit orbicular with three thin wings, 

 emarginate above and below, 8 to 10 lines wide, the body rather broad 

 and with a light spongy exterior. — Frequent on the plains from the 

 Saskatchewan to the Arkansas and S. W. Colorado, and well repre- 

 sented in the figure of Marcy's Report, excepting the limb of the 

 perianth. A. cycloptera, Gray (Am. Journ. Sci. 2 ser. xv. 319, excl. 

 syn.), with which it has been confounded, is a more southern species of 

 Western Texas, New Mexico, and S. Colorado, of stouter habit, and 

 with large showy flowers upon elongated peduncles. The fruit has a 

 firmer and more prominently veined wing, emarginate at neither end, 

 the firm smooth narrow body 7 to 12 lines long and usually 3-nerved 

 between the wings. The third species of the section, A. Crux-Maltce, 

 Kellogg (Proc. Calif. Acad. ii. 71, fig. 16), of Western Nevada, with 

 very showy flowers upon peduncles about equalling the leaves, has 

 a smaller orbicular-winged fruit (5 or 6 lines in diameter), the ovate 

 body pubescent and coarsely reticulate-pitted. 



RuMEX occiDENTALis. Tall and rather slender, often 3 to 6 feet 

 high : leaves oblong-lanceolate, the lowest sometimes ovate, usually 

 narrowing gradually upward from the truncate somewhat cordate base, 

 not decurrent on the slender often elongated petiole, acute, a foot long 

 or more, scarcely uudulate : panicle narrow, elongated, nearly leafless : 



