388 PROCEEDINGS OF THE AMERICAN ACADEMY. 
EnceLtta Mexicana, Mort. <A noteworthy form of this species, 
collected in fields and copses about Tequila, September and October, 
1893 (no. 4602), has ovate-deltoid unlobed leaves, slender petioles 
(entirely devoid of the clasping auricular appendages so common in 
the species), large and long-peduncled heads, elongated and very 
glandular involucral bracts less villous than in other specimens at 
hand. While different forms of this species certainly show striking 
differences in the features mentioned, a series of specimens show that 
these characters vary quite independently of each other, forming 
various combinations, so that varieties based upon them could have 
little more than formal value. 
CoREOPSIS PETROPHILOIDES. Stem furrowed, light brown, nearly 
or quite glabrous, leafy above; branchlets angulate, slightly pubes- 
cent: leaves simple, lanceolate, acute, incised-serrate, glaudular-punc- 
tate, 14-3} inches long, one third as broad, slightly pubescent above, 
smooth and very pale beneath: heads nearly } inch long, rather 
short-peduncled, aggregated in terminal corymbose_ inflorescences : 
floral leaves reduced to short linear-oblong entire bracts : outer scales 
much shorter than the inner; the latter oblong, obtusish: rays deep 
yellow, 4 inch in length: achenes bi-aristate, strongly ciliated upon the 
margins, silky-villous upon one face, glabrous upon the other (toward 
‘the chaff).— Collected on the Nevado de Colima, 22 May, 1893 
(no. 5508). In habit, inflorescence, and heads, very close to O. petro- 
_ phila, Gray, but with undivided leaves much paler beneath. 
Perezia Prineier. Stem strict, rather stout, herbaceous, pubes- 
cent, purplish, 3 feet or more in height: leaves harsh, oblong, obtuse 
but mucronulate, sessile, cordate-clasping, doubly spinose-dentate, gla- 
brons, and strongly reticulate-veined above, finely pubescent beneath, 
3-5 inches long, 1-2 inches broad; the upper ones gradually smaller 
and acute: heads large, terminal upon short branches springing from t 
upper axils, and together forming a racemiform inflorescence a foot in 
length : involucral bracts regularly imbricated in 5-6 series, ovate to 
lanceolate, acute to acuminate, purplish upon the exposed portion ; the 
‘nner ones nearly an inch in length: flowers about 50 in each head: 
corollas purple, 7 lines long. — Collected on hills near Morelia, Mich- 
oacan, 22 October, 1893 (no. 5464). This species has somewhat 
the foliage of P. rigida, Gray, but heads much larger and differently 
isposed. 
Goxotonus aneusritosus. Branches slender, twining, pulveru- 
lent, and covered with roughish, spreading pubescence: petioles about 
‘n inch long, pubescent ; leaves ovate, acuminate, cordate withadeep = 
