266 PROCEEDINGS OP THE AMERICAN ACADEMY. 



reddish-brown or chocolate-colored eye near the base : pales of the re- 

 ceptacle tipped with black : disk-flowers numerous ; mature achenes 

 about 1.5 cm. in length, attenuated above into a long slender beak, gla- 

 brous towards the base, pubescent above. — Mexico. State of Guerrero : 

 thin soil of the knobs of the Sierra de Tepoxtlan, altitude 2285 m., 

 4 October, 1900, C. G. Pringle, no. 8386 (hb. Gr.), distributed under 

 the name " Bidens daucifolia, DC." 



A portion of the type-number of De Candolle's species is in the Gray 

 Herbarium, and a careful comparison of Mr. Pringle's plant with it 

 shows the two to be rather remotely related. The larger heads, the 

 broader deeply notched bicolorous rays readily separate the Pringle 

 plant from Bidens daucifolia, DC. ; and moreover its distinctly long- 

 attenuated or beaked achenes place it in the genus Cosmos. 



Eutetras Pringlei, n. sp- An herbaceous perennial, more or less 

 glandular pubescent throughout: stems erect or ascending, 1.5 to 3 dm. 

 or more in length, often with tufts of white hairs in the leaf-axils : leaves 

 opposite, petiolate, deltoid-ovate, 1 to 4.5 cm. long, 1 to 4 cm. broad, 

 acute, irregularly and rather coarsely sinuate-dentate, dark green, 3- 

 nerved from the cordate base, the lateral nerves again branching ; peti- 

 oles 0.5 to 3 cm. in length, canaliculate above : inflorescence a few-headed 

 corymbose cyme; peduncles 2 to 5 cm. long, upwardly enlarged just 

 below the involucre: heads about 12 mm. high, including the fully ex- 

 panded rays 2.5 to 3 cm. in diameter : involucre broadly campanulate, a 

 little shorter than the flowers of the disk; bracts of the involucre uni- 

 seriate, linear-lanceolate, acuminate, about 1 cm. long, acute: ray-flowers 

 12 to 15, fertile; corolla-tube 3.5 mm. long, stipitate-glandular ; rays 

 oblong, 10 to 12 mm. long, 4 to 5 mm. broad, 3-dentate, white: disk- 

 flowers numerous ; corollas tubular, 7 mm. long, 4-dentate : anthers 

 conspicuously appendaged with oblong appendages : pappus of both ray- 

 and disk-flowers of 4 short lacerated scales alternating with an equal 

 number of slender setae, persistent : mature achenes 3.5 mm. long, 

 pubescent along the angles, nearly or quite glabrous on the four faces. 

 — Mexico. State of Guanajuato : about basaltic cliffs, near Acambaro, 

 6 October 1904, C. G. Pringle, no. 8813 (hb. Gr.). 



This genus has been known hitherto only through E. Palmeri, pub- 

 lished by Dr. Gray in 1880. The discovery of a secoud species is note- 

 worthy, especially as the plant was found in a region quite remote from 

 Dr. Palmer's locality. E. Pringlei exhibits perfectly the general charac- 

 ters ascribed to the genus by Dr. Gray, and it is readily distinguished from 

 E. Palmeri by being larger throughout, and of a less caespitose habit. 



