270 PROCEEDINGS OF THE AMERICAN ACADEMY. 



quently somewhat pubescent. The Durango collection adds another station 

 towards determining the geographical range of the species. 



Trixis megalophylla, n. sp. Shrub: stem covered with a grayish 

 brown bark, at first pubescent, later glabrate, somewhat winged from the 

 decurrent foliage: leaves short-petiolate or the uppermost subsessile, 

 oblong-lanceolate, 5 to 17 cm. long, 1.5 to 6 cm. broad, acute, entire or 

 denticulate, revolute-margined, mostly contracted at the base into a short 

 narrowly winged petiole, hirtellous-puberulent above, tomentulose be- 

 neath; midrib and lateral veins prominent on the under surface: inflo- 

 rescence a terminal leafy glandular-hirtellous paniculate cyme ; bracts of 

 the inflorescence ovate to ovate-lanceolate, foliaceous : heads 15 to 18 mm. 

 high, about 12-flowered: outer or accessory bracts of the involucre lan- 

 ceolate or slightly oblanceolate, nearly equalling or a little exceeding 

 the linear-oblong about 12 mm. long short-acuminate inner true involu- 

 cral-bracts ; mature achenes about 7 mm. long, hirtellous-pubescent with 

 a few glandular hairs intermixed. — Mexico. State of Guerrero: be- 

 tween Sochi and Tlalkinsala, altitude 1100 to 1465 m., 29 November, 

 1894, E. W. Nelson, no. 2038 (hb. Gr., and hb. U. S. Nat. Mus.). On 

 account of the large leaves and the glandular inflorescence the species is 

 very characteristic, and readily recognized among all the other species 

 of the genus. 



Trixis Nelsonii, n. sp. Shrub : stem covered with a brownish bark, 

 wingless ; ultimate branches tawny-pubescent : leaves petiolate, elliptic- 

 ovate to oblong-lanceolate, 3 to 7 cm. long, 1 to 3 cm. broad, abruptly 

 acuminate-apiculate, entire or denticulate, narrowed at the base into a 

 short petiole, rugulose and somewhat hirtellous on the upper surface, 

 densely and permanently tomentose beneath, revolute-margined ; petioles 

 5 to 8 mm. long : heads about 1.5 cm. high, rather crowded at the ends 

 of the branches : bracts of the outer involucre mostly oblanceolate, 5 to 

 8 mm. long, acute ; inner bracts of the true involucre 8, linear-oblong, 

 about 12 mm. long, short-acuminate, acutish, and as well as the outer 

 bracts and peduncles tawny-pubescent intermixed with glandular hairs or 

 glandular papillae : flowers about 16. — Mexico. State of Chiapas : be- 

 tween San Cristobal and Teopisca, altitude 2040 to 2590 m., 4 Decem- 

 ber, 1895, E. W. Nelson, no. 3459 (hb. Gr., and hb. U. S. Nat. Mus.). 

 Of the known species of this genus T. Nelsonii is nearest T. rugulosa, 

 Rob. & Greenm., but differs in having broader leaves, which are abruptly 

 contracted at the apex not gradually attenuated, and in being densely and 

 permanently tomentose beneath ; moreover, the outer involucral bracts 

 in T. Nelsonii are usually broader than in T. rugulosa. 



