568 PROCEEDINGS OF THE AMERICAN ACADEMY. 



ngly veiny, S to 8.5 cm. long.- Mexico, Sierra de las Cruces, alt, 

 .... Sept. 19, L899 (O. G. Pringle, no. 8225); Vera Cbcz, 

 Orizaba ('■ , no. 207): ax ac a, slopes of .Mt. Zempoaltepec, alt 

 2,400 to 3,080 m.. July 5-10, 1894 (J2. \l. Nelson, nos. 587, 681): 

 Jalisco, between Huejuilla and Monte Escobedo, Aug. 25, 26, 1897 

 (./. X. Rose, ii"-. 2577, 2606). Nearly related to P. arenicola, Kear- 

 ney, of the southeastern United States. 



P. philippensis. Freely branching from a stout woody eaudex : the 

 slender branches somewhat ligneous at base, about 1 din. in length, lone- 



pilose with crisp white jointed hairs: leaves appressed-pubescenl abo 



pilo.se beneath on the veins and ciliate on the margins, broadly rhombic- 

 obovate, coarsely and bluntly angnlate-sinuate, I to •'! cm. long, 1 to 2.5 

 cm. wide, broadly subcuneate below to a broad long-pilose petiole 1 

 to 1.5 cm. long: peduncles 1 cm. long, pilose: calyx during anthi 

 about 8 mm. long, white-pilose, cleft into narrowly ovate acutish or 

 blunt lobes: corolla short-cainpanulate, 1.5 cm. long, 2 to 2.5 cm. 

 broad, whitish or pale yellow, with very broad purplish markings : 2 

 filaments longer than the others, 7 mm. long; anthers short-oblon_ r . 

 purple and yellow, 3 or 4 mm. long: fruit not seen. — Oaxa< \. 

 Sierra de San Felipe, alt. 2,G17 in., dune 1, 189-4 ( C. G. J , r>'u>/l>- ) no. 

 5621). 



P. sordida. Perennial, densely pubescent all over with short sordid 

 glandular-pilose hairs: the stems depressed, 4 or 5 dm. long, freely 

 branching: leaves from suborbicular to ovate, coarsely but bluntly 

 sinuate-dentate, subcordate or truncate below, pubescent on both fa 

 1 to 5 cm. long, 1 to 3 cm. broad, on slender glandular-pilose petioles 1 

 to 3 cm. long: peduncles short, barely 1 cm. long in fruit: calyx in 

 anthesis or 7 mm. long, sordid-pubescent, with triangular-lanceolate 

 acute lobes: earlier corollas 1.5 cm. broad, sulphur-yellow, with small 

 drab or brownish patches at base : filaments somewhat unequal; anthers 

 yellow and green, narrowly oblong. .'J or 4 mm. long: fruiting calyx 

 broadly short-ovate, glandular-pilose, not conspicuously angled. 1.5 to 

 L' cm. long. — Apparently in sand (the entire plant coated with fine sand), 

 Oaxaca, Boca de Leon, Telixtlahuaca, alt. 2,810 m.. Aug. 8, 1895 



(Albert L. Smith, no. 637). Nearest related, apparently, to P. mlu/n/ata, 



Rydberg, of the southwestern United States. 



P. saltillensis. I'uberulent throughout with fine white stellate hairs: 

 branches slender, terete below, Bub-angulate above: bases elliptic ovate, 

 coarsely and bluntly sinuate-dentate, the upper unequal and geminate, 3 

 to •; ,ni. long, 2 to 1 em. wide, unequally subcuneate or rounded at base 



