30 NORTH AMERICAN FLORA [Volumk 34 



both sides, 1-2 cm. long; heads few, corymbose or solitary; involucre hemispheric, 6-7 mm. 



high, about 12 mm. broad; bracts oblanceolate, acute, glandular-pubescent, the inner with 



broad membranous margins; ray-flowers about 20; ligules white, 8 mm. long; disk-flowers 



glandular, puberulent, short, 5-toothed; style-appendages subulate; achenes linear, hispidulous 



on the 4 angles, otherwise glabrous; pappus of a small callous crown. 



Type locality: San Quentin, Lower California. 

 Distribution: Lower California and California (?). 



2. Amauria Brandegeana (Rose) Rydberg. 



Perityle Brandegeana Rose, Bot. Gaz. 15: 114. 1890. 



A perennial; stem 1-3 dm. high, glabrous below, glandular above; leaves petioled; 



blades cordate, 2-3 cm. long, glandular-puberulent, 3-ribbed, more or less lobed and doubly 



dentate; heads cj^mose; involucre 5 mm. high, 7-9 mm. broad; bracts oblanceolate, acute, 



glandular-puberulent; ligules white, oblong, 5-6 mm. long; disk-corollas 3 mm. long; throat 



abruptly contracted into the tube; style-tips obtuse; achenes linear, 3-4 mm. long, 4-angled, 



sparingly hispid on the faces and more so on the angles with crinkled hairs. 



Type locality: Lagoon Head, Lower California. 

 Distribution: Lower California. 



22. EUTETRAS A. Gray, Proc. Am. Acad. 15: 39. 1875. 



Low shrubs with petioled, opposite leaves. Heads radiate, many-flowered. Involucre 

 hemispheric or campanulate; bracts about 20, subequal, in two series, the outer subherbaceous, 

 linear, glandular, double-ribbed, the inner with more scarious margins. Receptacle convex, 

 naked. Ray-flowers pistillate, fertile; ligules oblong, 3-toothed. Disk-corollas numerous, 

 hermaphrodite and fertile; tube glandular-puberulent, shorter than the narrow cylindric 

 throat; limb 4-toothed. Anthers 4, sagittate at the base with obtuse tips. Style-branches 

 linear, obtuse, hirtellous. Achenes linear or linear-oblong, 4-angled, glabrous or hispid on 

 the angles. Pappus of 4 broad, truncate, erose squamellae and alternating with them 4 

 barbellate awns. 



Type species, Etitetras Palmeri A. Gray. 



Leaves green, densely glandular; involucre 1 cm. high, 12 mm. broad; rays 12-15. 1. E. Pringlei. 



Leaves cinereous; involucre 5 mm. high, 7-8 mm. broad; rays 9-12. 2. E. Palmeri, 



1. Eutetras Pringlei Greenman, Proc. Am. Acad. 41: 266. 1905. 



A low shrub; stem erect, 1.5-3 dm. high, densely glandular and somewhat white-hispid 



in the axils; leaves opposite; petioles 0.5-3 cm. long, channeled above; blades deltoid-ovate, 



1-4.5 cm. long, 1-4 cm. broad, acute, sinuate-dentate, dark-green, 3-ribbed at the cordate or 



truncate base; heads few in corymbose cymes; pedimcles 2-5 cm. long, densely glandular, 



gradually thickened upwards; involucre broadly campanulate, nearly 1 cm. high, about 



12 mm. broad; bracts linear-lanceolate, acuminate, acute, densely glandular; ray-flowers 



12-15; tube 3.5 mm. long, glandular-pubescent; ligules oblong, 10-12 mm. long, white; 



disk-flowers numerous; corollas tubular, 7 mm. long, 4-toothed; achenes 3.5 mm. long, 



pubescent on the angles; squamellae 0.5 mm. long; awns about 5 mm. long. 



Type locality: Basaltic cliffs near Acambaro, Guanajuato. 

 Distribution: Known only from the type locality. 



2. Eutetras Palmeri A. Gray, Proc. Am. Acad. 15: 40. 1879. 

 A low shrub; stem 1 dm. high or more, densely puberulent and glandular; leaves sub- 

 opposite, petioled; petioles about 1 cm. long; blades deltoid-ovate, dentate, cinereous- 

 pubescent, triple-ribbed at the base, 1-2 cm. long, 0.75 cm. wide; heads short-peduncled; 

 involucre broadly campanulate, 7 mm. broad; bracts about 20, subequal in 2 series, 5 mm. 

 high; ray-flowers 9-12; ligules white or tinged with rose, oblong, 3 mm. long; disk-flowers 

 numerous, tubular, 4-toothed; achenes oblong-linear, 4-angled, nearly glabrous, 2.5 mm. long; 

 squamellae 0.3 mm. long; awns 2 mm. long. 



Type locality: Near Angostura, 100 miles east of San Luis Potosi. 



Distribution: Known only from the type locality. 



Illustrations: Hemsl. Biol. Centr. Am. Bot. pi. 43, f. 6-U; E. &. P. Nat. Pfl. 4^:/. 124, M. 



