4 PROCEEDINGS OF THE AMERICAN ACADEMY. 
Subgenus Eurripax. Scales of the involucre 2-several-seriate: 
achenes densely silky-villous or hirsute: pappus scales terminating in 
plumose awns. 
§ 1. Scales of the involucre very unequal, regularly imbricated in 
several to many series, gradually decreasing in size ; the outermost very 
short, mostly scarious and rounded at the summit, very rarely somewhat 
herbaceous or (in 7. angustifolia) subacute. 
* Heads discoid: pappus shorter than the achenes. 
1. T. brachylepis, Hemsl. “ Annual, erect,” with “slender gla- 
brescent branchlets” and “thickish ovate-lanceolate dentate or sometimes 
obscurely lobed leaves.” — Biol. Cent.-Am. Bot. ii. 207. — Cordillera of 
Oaxaca, altitude 7,000 feet, Galeotti. The only specimen, seen by the 
writers, closely approximating in its characters Mr. Hemsley’s descrip- 
tion is no. 1423 of #. W. Nelson, collected in the Valley of Oaxaca, 
altitude 5,500 to 7,500 feet, 20 September, 1894. But although only the 
_ upper portion of the root is at hand it is not unlikely perennial. 
\ 
T. tuberosa. Distinctly perennial; the elongated woody root 
at places tuberous-thickened: stem decumbent, subsimple, 3 feet im » 
height, leafy to the middle, hirsute: leaves hirsute upon both surfaces, 
3-nerved, 2 inches long, nearly half as broad, cuneate at the base and 
3-cleft with sharply toothed acute lobes: heads about 6, nearly 7 lines 
long and 6 lines in diameter: pappus only a third to half the length of 
the achene. — Collected by C. G. Pringle, on the Sierra de San Felipe, 
Oaxaca, altitude 7,000 to 8,500 feet, 17 November, 1894, no. 5644 a. 
3. T. Pringlei. Perennial, decumbent, much branched from neat 
the base, 2 feet high, pubescent throughout but less hirsute than the 
preceding: root woody, tuberous-thickened at intervals: leaves lanceo- 
late, dentate or subentire, obtusish, 1 to 1} inches long, scarcely a third 
as broad, 1-nerved: heads 2 to 4, very similar in all respects to those of 
the preceding. — Collected by ©. G. Pringle, on the Sierra de ap 
Felipe, Oaxaca, altitude 7,500 feet, 7 September, 1894, no. 5644. in 
technical characters very close to the preceding species, but with markedly 
* * Heads radiate : ligules evident. 
+ Mexican species. 
++ Rays yellow. 
= Pappus very short or none. 
t annual, a foot or two high, with lance-oblong obtusish and 
coarsely few-toothed or laciniate leaves (cuneate at the base) and numer 
: iz 4. T. trilobata, Hemsl. I.c. 208. Erect much branched glandulat- 
ee bescen 
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