16 NORTH AMERICAN FLORA [Volume 34 



cm. long; involucre hemispheric, 5 mm. high, 5-7 mm. broad; bracts oblanceolate, acute, 

 glandular-puberulent; ligules about 10, white, 2-3 mm. long, 3-crenate; disk-corollas glandular- 

 puberulent, nearly as long as the achenes; style- appendages oblong, obtuse; achenes short- 

 hirsute on the margins, linear or linear-oblanceolate, 3 mm. long, with some deciduous hairs on 

 the faces; pappus of a crown of small lanceolate squamellae and a single awn 2 mm. long, or 

 bristle wanting (var. nuda). 



Type locality: Cordilleras of California. 



Distribution: Southern California, Arizona, Sonora, and Lower California. 



Illustration: Bot. Gaz. 15: pi. 13, f. 6. 



11. Perityle Greenei Rose. Bot. Gaz. 15: 117. 1890. 



Perilyle Fitchii Greene, Bull. Calif. Acad. 2: 403. 1887. Not P. Fitchii Torr. 1857. 



Perityle californica Vasey, Proc. U. S. Nat. Mus. 11: 368. 1889. Not P. californica Benth. 1844. 



A glandular-puberulent and slightly hirsute winter annual; stem 1-3 dm. high, more or 



less branched; leaves petioled, opposite or alternate; petioles 1-2 cm. long; blades ovate, cordate 



or suborbicular in outline, 1-2 cm. long, deeply palmately cleft and serrate; peduncles 1-4 cm. 



long; involucre 5 mm. high, 5-6 mm. broad; bracts oblanceolate; ray-flowers 10-12; ligules 



white, broadly oval-oblong, 2 mm. long, sinuately 3-toothed; disk-corollas slightly shorter 



than the achenes; style-appendages acute; achenes linear-oblong, 2.5 mm. long, short-hirsute 



on the margins ; pappus of a short crown of united lacerate squamellae, and a single awn half 



as long as the achene or wanting. 



Type locality: Santa Cruz Island, California. 



Distribution: Islands off Southern California and Lower California. 



Illustration: Bot. Gaz. 15: pi. 13, f. 7. 



12. Perityle socorrensis Rose, Bot. Gaz. 15: 118. 1890. 



Originally described as apparently annual, but more likely perennial; stem densely his- 



pidulous and glandular-puberulent; leaves short-petioled ; blades ovate or deltoid, 1-2 cm. 



long, thick, densely glandular-hispidulous, crenate; peduncles 2-5 cm. long; involucre about 



5 mm. high, 6-7 mm. broad; bracts linear-lanceolate, glandular-hispidulous; ligules 3-toothed, 



white, 3 mm. long; disk-flowers slender, 3 mm. long; style-branches with broad and acute 



tips; achenes oblong, 3 mm. long, ciliate on the margin, hispidulous on the faces; pappus of a 



crown of minute bristle-like squamellae, and 2 unequal awns scarcely half as long as the 



achene. 



Type locality: Socorro Island. 

 Distribution: Revillagigedo Islands. 

 Illustration: Bot. Gaz. 15: pi. 13, f. 9. 



13. Perityle crassifolia Brand. Proc. Calif. Acad. II. 3: 147. 1891. 



Perennial, somewhat woody at the base; stem striate, 3-5 dm. high, densely arachnoid- 

 villous and glandular-puberulent; leaves mostly alternate; petioles about 1 cm. long; blades 

 reniform or cordate-ovate, crenate, 1-2 cm. long, densely arachnoid- villous ; peduncles 1-4 

 cm. long; involucre 6-7 mm. high, 10-12 mm. broad; bracts lanceolate, arachnoid- villous ; 

 ray-flowers 15 or more; ligules white, spatulate, 6-7 mm. long; disk-corollas glandular-puberu- 

 lent, about as long as the achenes; throat about equaling the tube; achenes somewhat curved, 

 pubescent on the faces, ciliate on the margins; pappus of a short lacerate crown of squamellae, 

 and a single retrorsely barbed awn about equaling the achene. 



Type locality: San Jose del Cabo, Lower California. 

 Distribution: Southern Lower California. 



14. Perityle robusta Rydberg, sp. nov. 



Apparently perennial with a taproot; stem striate, 3-5 dm. high, somewhat arachnoid- 

 pubescent at the base, glandular and viscid above; leaves mostly alternate; petioles 1-2.5 cm. 

 long; leaf-blades cordate or reniform in outline, 1-2.5 cm. broad, thick, somewhat arachnoid 

 viscid-pubescent and glandular-puberulent, more or less deeply lobed and crenate; heads in 

 leafy panicles; peduncles 1-5 cm. long, glandular-pubescent; involucre aboit 8 mm. high and 



