GREENMAN. — CENTRAL AMERICAN SPERMATOPIIYTES. 35 



achenes 4 mm. long, pubescent. — ]\Ii:xico. State of Jalisco : Guad- 

 alajara, 22 September, 1903, E. W. D. Holwatj, no. 5022 (lib. Gr.). 



In general appearance this species resembles B. Coiilteri, and B. 

 brachiata. Gray. From the former it differs in having constantly larger 

 leaves and longer petioles, in the pubescence of peduncles, etc. ; from the 

 latter species it differs conspicuously in the lance-attenuate involucral 

 bracts, which are gradually narrowed to the tip, not abruptly contracted 

 at the apex and mucronate. 



Barroetea sessilifolia, n. sp. Annual : stem erect, about 8 dm. high, 

 usually much-branched, terete, hirsutish-pubesceut with spreading or 

 subappressed hairs; branches arcuate-ascending: leaves opposite, sessile, 

 ovate, 1.5 to 5 cm. long, 1 to 4 cm. broad, subulate-dentate, hirsute- 

 pubescent on both surfaces, especially on the midrib and veins beneath, 

 3-nerved from the base : inflorescence a loose panicle: heads about 1 cm. 

 high : involucre 4-o-seriate ; bracts of the involucre lanceolate, subulate- 

 acuminate, glabrous, conspicuously nerved, pale-green, scarious-margined : 

 mature achenes 3 to 3.5 mm. long, dorso-ventrally compressed, the outer 

 surface 3-4-nerved, the inner 1-2-nerved. dull brown, slightly pubescent 

 on the nerves. — Mexico. State of Morelos : limestone hills near 

 Yantepec, altitude 1220 m., 21 October, 1902, O. G. Pringle, no. 9863 

 (hb. Gr.), distributed as " Brickellia diffusa., Gray." State of Guerrero : 

 vicinity of Acapulco, October, 1894 to March, 1895, Di\ Edward Palmer, 

 no. 625 (hb. Gr.), originally determined as '■'Barroetea subuUgera, Gray." 



Barroetea subuligera, Gray, va,r. latisquama, n. var. Habit 

 and foliage of the species : heads 30-35-flowered ; involucral bracts lance- 

 olate to lance-oblong, mostly abruptly contracted at the apex and ter- 

 minated by a mucro, more or less tinged with purple : achenes 3 mm. 

 long, ciliate, sparingly pubescent on botli surfaces. — Mexico. State 

 of Jalisco : on dry rocky mountains near Etzatlan, 27 October, 1903, 

 C. G. Pringle, no. 8773 (hb. Gr.). 



Gutierrezia argyrocarpa, n.sp. Suffruticose: stem much-branched, 

 striate, hirtellous-puberulent : leaves linear to linear-spatulate. 1 to 1.5 

 cm. long, 1 to 2.5 mm. broad, obtusish, entire, glabrous on both surfaces : 

 heads numerous, 4 to 5 mm. high, sessile or pedunculate, terminating the 

 branches in cymose inflorescences : involucre campanulate, 3-seriate ; 

 bracts of the involucre narrowly oblong, appressed, herbaceous-tipped, 

 the outer shorter : receptacle convex, not elongated : ray-flowers mostly 

 6 ; pappus of the ray-flowers similar to that of the flowers of the disk 

 but shorter; rays pale yellow: disk-flowers about 12: achenes densely 

 appressed-sericeous ; pappus of 12 or more unequal somewhat lacerated 



