FERNALD. — GENUS PECTIS. 69 



involucre oblong-lanceolate, 6 mm. liigh, 8-9-flowered, of 3 or 4 oblong 

 acute nerveless conduplicate but scarcely keeled bracts : pales 3^ or 4 mm. 

 long, slightly exceeding the akenes. — Schz. Bip. in Gray, Proc. Am. 

 Acad. xix. 45. — Mexico, Valley of Mexico (Schaffner, no. 84). 



++++++ Erect or diffuse : involucre 7-10-bracteate : pappus rufescent, the lacini- 

 ate paleaceous bases often splitting away from tlie setulose awns. 



P. Bonplandiana, HBK. Slender, erect or diffuse, dichotomously 

 branched : the branches smooth or sparingly pubescent, 2 dm. or less in 

 height : leaves linear-lanceolate, mucronate, entire or minutely serrulate 

 toward the apex, 1 to 2^ cm. long, 1 to 3 mm. wide, irregularly dotted 

 beneath, with 1 or 3 pairs of basal setaB : heads terminal or axillary, soli- 

 tary on slender 4-5 bracteate peduncles 2 or 3 cm. long : involucre 4 to 

 4^ mm. high, about 20-flowersd ; bracts linear-oblanceolate, acutish or 

 blunt, conduplicate, minutely puberulent at the tips, keeled from above 

 the middle and bearing a few large glands : rays narrow, 2 mm. long : 

 awns of pappus subequal, the longest 2 ram. in length, in the disk 5 or 6, 

 in the ray 2, the lanceolate pales slightly laciniate : akenes puberulent, 



3 mm. long. — Nov. Gen. & Spec. iv. 263 ; Less. Linncea, vi. 712; DC. 

 Prodr. v. 99 ; Gray, Proc. Am. Acad. xix. 46. P. linearis, Willd. in 

 Less. 1. c. in syn. P. Seemanni, Gray, 1. c. v. 181, not Schz. Bip. — 

 Eastern Mexico. Tamaulipas, Tampico ^(fe DC. I.e.; Queretaro, 

 near Queretaro (Humboldt & Bonpland in HBK. 1. c.) ; Vera Cruz, 

 Wartenberg near Tantoyuca (Ervendberg, no. 137), Mirador (Liebmanu, 

 no. 395). 



P. Sinaloensis. Diffuse, the branches smooth or liirtellous, | to 4 

 dm. long : leaves oblanceolate or obovate-oblong, mucronate, entire, 2 cm. 

 or less long, 2 to 8 mm. wide, sparingly dotted on the pale lower surfaces, 

 naked or with 1 or 2 pairs of setse : heads much as in the last but larger, 

 on 4-7-bracteate peduncles 3 to 6 cm. (rarely 2| ^m.) long : involucre 4 

 to 5| mm. high, 30-40-flowered ; bracts more pubescent at the tips : rays 



4 or 5 mm. long : pappus much as in the last, 3|^ to 4 mm. long, the pales 

 more deeply laciniate : akenes sparingly appressed-pubescent or glabrate, 

 hardly equalling the pappus. — On dry hills. Northwestern Mexico, De- 

 cember and January. Sinaloa, Mazatlan (W. G. Wright, no. 1204, 

 F. H. Lamb, no 313). A specimen collected by Seemann (without 

 locality) belongs here, as probably does his no. 1490 from Mazatlan, 

 cited by Hemsley under P. Bonplandiana. 



-t— -1— Pales elliptic, mostly obtuse. 

 P. Swartziana, Less. Annual, erect, trichotomous above, slender, 

 smooth, about 3 dm. high : leaves lanceolate or oblong-linear, obtuse or 



