OF ARTS AND SCIENCES. 121 



exceeding the involucre : achenes 3-3^ lines long, linear, angled, 

 minutely appressed-pubescent : pappus of the disk achenes of 2 palea- 

 ceous awns equalling the achenes, and 3 much shorter oblong slightly 

 fimbriate paleai ; of the ray short paleaceous. — Rocky hills near Es- 

 peranza, 8,000 ft., August (no. 355). Resembling T. 'pedunculata, 

 Lag., and T. tenuifolia, Cav., in the characters of the flowers, but 

 with narrower leaflets and more simple stems terminated by single 

 peduncles. 



Senecio Orizabensis, Sch. Bip. Specimens collected on sandy 

 plains, Mt. Orizaba, 13,500 ft., August (no. 219), accord in every way 

 with the description of this species (Hemsl. Biol. Cent. Am. Bot., II. 

 244), except in having runcinate radical leaves. 



Euphorbia ramosa. SufFrutescent, 2-5 inches high : stems 

 decumbent or erect, slender, much branched, pubescent with spreading 

 hairs : leaves short-petioled, oblique at the base, ovate or suborbicular, 

 acutish, crenulate or very entire, glabrous above, sparsely hairy be- 

 neath, 2-3 lines long : stipules minute, triangular, lacerate : involucres 

 solitary or somewhat corymbose at the ends of the branches, short- 

 pedicelled, campanulate, glabrous, h line long : glands purple : ap- 

 pendages small, white, entire : styles very short, deeply bifid : capsules 

 glabrous, the valves obtusely angled : seeds ovate, 4-angled, irregularly 

 and transversely rugose. — Rocky slopes, Mt. Orizaba, 10,000 ft., 

 August (no. 495). Coulter's no. 1447 from Real del Monte also 

 represents small specimens of this species. It is cited by Hemsley 

 (Biol. Cent. Am. Bot., III. 90) as E. adeiioptera, BertoL, but it is very 

 distinct from that species, which has unequal involucral appendages 

 and hirsute capsules. The specimens in the Gray Herbarium were 

 unnamed, but the following characters had been noted upon the sheet 

 by Dr. Engelmann : " Stem and lower side of oblique ovate or orbicu- 

 lar crenulate or entire leaves hairy : stipe 3-angular, ciliate : involucre 

 with small white and wide appendages : styles divided to the middle : 

 capsule obtuse-angled: seeds sharp-angled, dark, cross-grooved, 0.5 line." 

 The specimens were mounted on the same sheet with E. pilosida, 

 Engel., and the two are nearly related in their pubescence and flower 

 and fruit characters, but E. pilosida is a much smaller plant with dis- 

 tinctly serrate leaves. The specimens from Mt. Orizaba, varying from 

 2 to 5 inches in height, differ only from Dr. Coulter's plant in being 

 apparently more erect, and they somewhat resemble in habit E. Fend- 

 leri, Torr. & Gray, and smaller forms of E. villifera, Scheele. 



Arundinella Deppea:n^a, Nees in Bonplandia, III. 84 ; Steud. 

 Syn. Gram. 115; Fourn. Mex. PI. Enum., Gram. 54. — Hills near 



