388 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Encelia 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 iuvolucral 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 petrophieoides. Stem furrowed, light brown, nearly 

 or quite glabrous, leafy above ; branchlets angulate, slightly pubes- 

 cent : leaves simple, lanceolate, acute, incised-serrate, glaudular-punc- 

 tate, 1^—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, \ 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 C. petro- 

 phila, Gray, but with undivided leaves much paler beneath. 



Perezia Pringlei. 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- 

 brous, 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 the 

 upper axils, and together forming a racemiform inflorescence a foot in 

 length : iuvolucral bracts regularly imbricated in 5-6 series, ovate to 

 lanceolate, acute to acuminate, purplish upon the exposed portion ; the 

 inner 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 

 disposed. 



Gonolobus angustilobus. Branches slender, twining, pulveru- 

 lent, and covered with roughish, spreading pubescence : petioles about 

 an inch long, pubescent ; leaves ovate, acuminate, cordate with a deep 



