OP ARTS AND SCIENCES. 297 



very narrowly linear with a contracted base, acute, 6 to 10 lines long, 

 much shorter on the branches : fertile flowers very small, often solitary, 

 the deeply cleft calyx unappendaged : seed very small (^ of a line 

 broad), horizontal, not at all tuberculate under the microscope. — 

 Utah and Arizona; Dr. C. C. Parry (u. 218, S. Utah, 1874, and 

 n. 84, Central Utah, 1875) ; L. F. Ward, on Powell's Survey (n. 152 

 and 718, 1875) ; also Hooker & Gray, 1878. Somewhat resembling 

 S. suffrutescens, which is more shrubby and pubescent, with lax and 

 flexuous stems, stouter and obtuser leaves, calyx less deeply lobed, 

 and the usually vertical seed obscurely tuberculate. 



Celtis brbvipes. A small tree (becoming 20 feet high and 18 

 inches in diameter), sparingly pubescent: leaves small (1 to 1£ 

 inches long), entire, oblong-ovate, acuminate, rounded or cuneate at 

 base, rather thin, finely but conspicuously reticulated, roughish 

 above : fruit nearly 3 lines long, on slender pedicels about equalling 

 the very slender petioles (2 lines long). — Near Camp Grant, Ari- 

 zona; Dr. J. T. Rothrock (n. 367), on Lieut. Wheeler's Survey, 1874. 



Croton (Drepadeniuh) tenuis. Perennial, woody at base, with 

 slender decumbent stems a foot or two high : leaves narrowly oblong, 

 a half to one inch long, with short petioles (1 to 4 lines) : staminate 

 flowers small and in small racemes : capsule 2 lines long : caruncle of 

 the seed prominent, with a broad appressed lobed base. — S. Cali- 

 fornia; Potrero, S. Diego County, D. Cleveland; Soda Lake, near 

 Fort Mohave, Cooper. — C. Californicus, Muell., differs in its less 

 slender habit and broader leaves with longer petioles, and especially 

 in its larger flowers and much larger capsules and seeds, the latter 

 with a small appressed caruncle. It differs also both in habit and 

 fruit from the allied C. Neo-Mexicanus of S. Utah and New Mexico, 

 and the Mexican G. gracilis. 



Stillingia linearifolia. Perennial, branching from a woody 

 base, the herbaceous slender terete ascending stems a foot high or 

 more : leaves linear, entire or rarely slightly glandular-toothed, acute, 

 sessile, 6 to 12 lines long: spikes terminal, very slender and open, 

 1 to 1^ inches long, with very small ovate acute 1-flowered bracts, 

 minutely glandular on each side : staminate flowers with turbinate 

 calyx, diandrous : pistillate flowers 2 to 7, scattered, without calyx : 

 capsule 1\ lines long; horns of the gynophore rather thin, and cen- 

 tral column often persistent : seed broadly ovate, acute, a line long, 

 smooth, without caruncle. — S. California ; near Boundary Monu- 

 ment, San Diego, Dr. E. Palmer (n. 449, 1875) ; San Bernai'dino, 

 Parry & Lemmon (n. 376, 1876). Referable, with the following 



