GREENMAN. — CENTRAL AMERICAN SPERMATOCYTES. iO 



ous -margined, obtusely keeled toward the base: ray-flowers about 13; 

 pappus of 2 slender setae; tube 1.5 mm long, puberulent; rays oblong, 



5 to G mm. long, yellow ; style-branches greenish : disk-flowers 40 to 

 45; pappus of 5 slender subequal setae and immerous shorter unequal 

 setae, often purplish: mature achenes 3 mm. long, inconspicuously puber- 

 ulent. — Mexico. State of Chihuahua : in the Sierra Madre near 

 Colonia Garcia, altitude 2285 m., 19 August, 1899, Toionsend 3^ Barber, 

 no. 269 (hb. Gr.), distributed " Pedis longipea, Gray " ; between Colonia 

 Garcia and Pratt's Ranch, below Pacheco, 22 to 24 August, 1899, 

 E. W. Nelson, no. 6269 (lib. Gr., and hb. U. S. Nat. Mus.). 



P. longipes, Gray, to which the Townsend & Barber plant was referred 

 is distinctly a perennial ; its stems are ascending or erect, usually branched 

 and more or less leafy ; the leaves, moreover, are linear or linc^ar-lanceo- 

 late. P. Barberi on the other hand is clearly an ainiual, with scapoid 

 habit and rosulate oblanceolate leaves ; it is one of the most clear cut 

 sj)ecies of the genus. 



Pectis (§ Eupectis) propetes, n. sp. Low annual, usually pros- 

 trate and much-branched: stems puberulent in lines, purplish: leaves 

 narrowly oblong to oblanceolate, 1 to 3.5 cm. long, 2 to 5 mm. broad, 

 obtuse or mucronate-acute, entire, setiferousciliate toward the base, 

 inconspicuously hirtellous-margined, pale green and glabrous on both 

 surfaces: glands of the leaves scattered: heads 8 to 10 mm. high, on 

 puberulent peduncles 4.5 cm. or less in length : involucre subcylindrical, 



6 to 7.5 mm. high, glabrous; bracts of the involucre 5, oblong, obtuse 

 or truncate at the apex, scarious-margined, obtusely keeled toward the 

 base, green or slightly purplish : ray-flowers 5, conspicuous ; pappus 

 commonly of 2 lanceolate pales; rays including the tube 8 to 9 mm. 

 long, yellow, in the early stages slightly tinged with pur[)le on the under 

 or outer surface : disk-flowers 20 to 25 ; pappus of 4 or 5 lance-acu- 

 minate pales about one-half as long as the subbilabiate corollas : achenes 

 about 4 mm. long, pubescent. — Mexico. State of Zacatecas : near 

 San Juan Capistrano, 19 August, 1897, Dr. J. N. Rose, no. 243G (hb. 

 Gr., and hb. U. S. Nat. Mus.). In general aspect Pectis propetes re- 

 sembles P. prostrata, but it is readily distinguished from it by the elon- 

 gated peduncles and the conspicuous ray-flowers. 



Pectis (§ Pectothrix) puberula, n. sp. A slender dichotomously 

 branched annual, 1 to 2 dm. in height: stems puberulent, often purplish : 

 leaves linear or linear-lanceolate, 1 to 3 cm. long, 4 mm. or less broad, 

 acute, bearing 1 to 4 pairs of setae near the base, otherwise entire, 

 glabrous on both surfaces, slightly hirtellous on the margins and on the 



