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 em. long, 1.5 to 6 em. 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. — Mrxico. State of Guerrero: be- 
tween Sochi and Tlalkinsala, altitude 1100 to 1465 m., 29 November, 
1894, BE. 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 4 
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 em. 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 of 
glandular papillae: flowers about 16.— Mexico. State of Chiapas: be- 
tween San Cristobal and Teopisca, altitude 2040 to 2590 m., 4 Decem 
ber, 1895, Z. W. Nelson, no. 3459 (hb. Gr., and hb. U. S. Nat. Mus.)- 
Of the known species of this genus 7. Melsonii is nearest 7. 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 7. Nelsonii are usually broader than in 7. rugulosa. 
