526 PROCEEDINGS OF THE AMEEICAN ACADEMY. 



obscurely serrate, acute or acumiDate: filiform pedicels 7 to 16 mm. long; 

 heads numerous, in leafy-bracted corymbs, few-flowered : rays 5 to 8, 

 oblong, 7 mm. long. — Sch. Bip. in Klatt, 1. c. — Sta. Talca, Liebmann, 

 no. 374; also near Totontepec, altitude 1,100 to 1,700 m., E. W. Nelson, 

 no. 783. Type in herb. Bot. Gard. Copenhagen ; a fragment in herb. 

 Gray. Perhaps a form of the next. 



14*. P. GRACiLE, Hemsl. From description very like the last pre- 

 ceding but leaves said to be sometimes as much as 1 dm. in length (more 

 than 3 times the size of any noted in P. microcephalum) : pedicels 1.2 

 to 2.5 cm. long. — Biol. Cent. -Am. Bot. ii. 181. — San Cristobal, Orizaba, 

 Bourgeau, no. 3206. Not seen by the writers. Type in herb. Kew. 



= = Heads larger ; involucral scales ciliate. 



a. Leaves green and scarcely paler beneath, scabrous-pubescent upon 

 both surfaces. 



15. P. Pringlei. Shrub, scabrous throughout ; brauches and pedun- 

 cles strigillose with minute appressed white hairs : leaves large (GL to 

 11 cm. long, 2 to 4 cm. broad), subentire to coarsely serrate-dentate, 

 reticulate-veiny beneath; petioles 1 to 2 cm. long: pedicels filiform, sub- 

 umbellate at the ends of the branches, 2 to 3 cm. long ; involucral scales 

 ovate to ovate-oblong: ligules about 8, pale yellow, 5 mm. long. — Slopes 

 of canons near Guadalajara, Jalisco, C. G. Pringle, 11 October, 1889, 

 no. 2338 (distrib. as P. Mendezii?). 



16. P. GYMNOLOMOiDES, DC. Shrub with tetragonal strigillose 

 branchlets: leaves ovate-lanceolate, entire, attenuate, acute, rounded at 

 the base, 5 cm. long, 1.5 to 1.7 cm. broad; petioles 3 mm. long: corymbs 

 few (3-5) -headed ; pubescence of the pedicels spreading; involucral 

 scales broadly ovate, rounded at the ciliated summit : achenes narrowly 

 or sometimes obsoletely winged, upwardly ciliated. — Prodr. v. 609 ; 

 Klatt, Leopoldina, xx. 95. Lipotviche gyvinolomoides. Less. Linnzea, 

 vi. 408. — Mexico, Misantla, Sckiede & De^jpe, Mirador, Sartorius ; 

 Guatemala, in copses near Coban, Alta Vera Paz, von Tuerckheim, 

 no. 339. 



17. P. rude. Shrub, 1 to 2 m. high, scabrous throughout: leaves 

 ovate, acutish, serrate, rounded or subcordate at the base, 2.5 to 3.7 cm. 

 long, 1.5 to 2 cm. broad: heads corymbose or subumbellate by 3's or 5*s 

 at the summit of short or sometimes elongated peduncles ; pubescence on 

 pedicels strigose, appressed; involucral scales in 2 to 3 series, broadly 

 ovate : ligules 8 to 10, oblong, bright orange, 7 to 9 mm. long — Hills 

 of Oaxaca, at Las Sedas, C. G. Pringle, no. 4803 (distrib. as P. gym- 



