18 NORTH AMERICAN FLORA [Volume 34 



achenes oblong, about 2.5 mm. long, ciliate on the callous margins, glabrous on the faces; pappus 

 of a crown of united erose squamellae and 2 awns nearly as long as the achene. 



Type locality: Sierra Madre, west of Bolafios, Jalisco, Mexico. 

 Distribution: Jalisco. 



19. Perityle Hofmeisteria Rydberg, sp. nov. 



A low perennial with woody caudex; stems slender, about 1 dm. high; leaves mostly op- 

 posite; petioles about 5 mm. long; blades minute, rhomboid, entire or often with 1 tooth on 

 each side, 3-6 mm. long, grayish-puberulent and somewhat impressed-punctate ; peduncles 

 slender, about 1 cm. long; involucre turbinate, 5 mm. high, 5-6 mm. broad; bracts puber- 

 ulent, oblanceolate, acute; ray-flowers 10-12; ligules white, oblong, 3-4 mm. long, deeply 3- 

 toothed; disk-corollas glandular- puberulent, nearly 3 mm. long, the tube equaling the narrowly 

 funnelform throat; achenes 3 mm. long, linear-oblong, densely hirsute on the callous margins 

 and slightly so on the faces; pappus of a short crown of lanceolate squamellae and 2 awns about 

 as long as the achene. 



Type collected at the City of Durango, 1896, Edward Palmer 28 (herb. N. Y. Bot. Gard.). 



20. Perityle jaliscana A. Gray, in S. Wats. Proc. Am. Acad. 22: 



431. 1887. 



A low perennial with a woody caudex; stem puberulent, branched at the base, 5-15 cm. 

 high; leaves oppositfe; petioles 1—1.5 cm. long; blades deltoid or rhombic, 5-15 mm. long. 

 3-ribbed, angularly toothed, puberulent and impressed-punctate; heads corymbose; peduncles 

 slender, 1 cm. long or less; involucre turbinate, 4-5 mm. high and fully as broad; rays none; 

 disk-corollas whitish, glandular-puberulent, 2 mm. long, the tube about equaling the throat; 

 achenes linear-oblong, 2 mm. long, hirsute on the faces as well as on the margins, slightly carin- 

 ate on the faces ; pappus of a crown of short squamellae and two awns one half to one third as 

 long as the achene. 



Type locality: Rio Blanco, Jalisco. 

 Distribution: Jalisco. 



21. Perityle Vaseyi Coult. Contr. U. S. Nat. Herb. 1: 42. 1890. 



Perennial with a woody base; stem 2-3 dm. high, glandular-pubescent; leaves mostly 

 alternate; petioles 1—2 cm. long; blades triangular in outline, 2-4 cm. long, pinnately or palm- 

 ately divided into long divisions which are again cleft and lobed, the ultimate lobes being 

 cuneate; peduncles 3-7 cm. long; involucre 8-10 mm. high, 10-12 mm. broad; bracts linear- 

 oblong, acute or acuminate, ciliate, especially at the tips; ligules deep-yellow, 4-6 mm. long, 

 oblong, 3-toothed; disk-corollas funnelform, 5.5 mm. long; style-appendages filiform-subulate, 

 hirsute; achenes oblong, pubescent on the faces, hispid-ciliate on the margins, 3.5 mm. long; 

 pappus of a crown of bristle-like squamellae and a single barbellate awn as long as the achene. 



Type locality: Chisos Mountains, Texas. 

 Distribution: Known only from the type locality. 

 Illustration: Contr. U. S. Nat. Herb. 2: pi. 3. 



22. Perityle lineariloba Rydberg, sp. nov. 



A suffruticose perennial; stems decumbent, about 3 dm. long; branches grayish-puberulent ; 

 leaves mostly opposite; petioles slender, 1-2 cm. long; blades 2-3 cm. long, very thin, triangular 

 in outline, pinnately 3-5-divided, finely puberulent and slightly glandular-granulif erous ; 

 divisions entire, linear or nearly so, or cleft into linear divisions; peduncles slender, 5-10 cm. 

 long; involucre hemispheric or slightly turbinate, 4 mm. high, 5-7 mm. broad; bracts puberulent, 

 lanceolate, acute ; ray-flowers 10-15 ; ligules white, oblong, 4 mm. long; disk-corollas 2 mm. long; 

 tube slightly shorter than the cylindro-campanulate throat; style-appendages short-subulate; 

 achenes oblong-obovate, 1.5 mm. long, pubescent on the faces and the callous margins; pappus 

 of a crown of lanceolate squamellae and one minute awn not more than twice as long as the hairs. 



Type collected at San Ramon, Durango, April 21-May 18, 1906, Edward Palmer 89 (herb. N. Y. 

 Bot. Gard.). 



