174 NORTH AMERICAN FLORA [Volume 34 



oblanceolate, united to near the triangular apex; glands 3-5, rather irregularly disposed; ligules 

 broadly oval, 5 mm. long, 3-4 mm. wide; disk-corollas 3 mm. long; tube shorter than the 

 elongate-funnelform throat; lobes ovate; achenes 2.5 mm. long, hirsutulous; squamellae about 

 10, the body very short, usually 2-cleft at the apex, with acute or obtuse awnless lobes and 

 some or all of them with a slender awn between the lobes. 



Type locality: "Chile?" [but probably Mexico]. 

 Distribution: Durango to San Luis Potosi and Hidalgo. 



6. Thymophylla aurea (A. Gray) Greene; Britt. & Brown, 111. Fl. 



3: 453. 1898. 



Lowellia aurea A. Gray, Mem. Am. Acad. II. 4: 91. 1849. 

 Hymenatherum aureum A. Gray, Proc. Am. Acad. 19: 42. 1883. 

 Dyssodia aurea A. Nelson; Coult. & Nels. Man. 563. 1899. 



A glabrous annual; stem diffusely branched, 1-1.5 dm. high; leaves pinnatifid into 7-11 

 filiform divisions, the lower opposite, the upper alternate, with conspicuous glands; peduncles 

 1-3 cm. long; involucre turbinate-hemispheric, about 5 mm. high and 8 mm. broad; bracts in 

 two series, united to near the ovate tips, each with 2-4 large glands; ray-flowers 14 or 15 ; ligules 

 7-8 mm. long, golden-yellow; disk-corollas 3 mm. long; tube much shorter than the trumpet- 

 shaped throat; lobes ovate; achenes 3 mm. long, angled and striate; squamellae about 0.3 

 mm. long, oblong, truncate, erose at the apex. 



Type locality: Between Cold Spring and Upper Spring, Cimarron Creek [probably Texas]. 

 Distribution: Kansas and Colorado to Texas and Chihuahua. 

 Illustrations: Britt. & Brown, 111. Fl. /. 3980; ed. 2. /. 4550. 



7. Thymophylla Wrightii (A. Gray) Small, Fl. SE. U. S. 1295. 



1903. 



Hymenatherum Wrightii A. Gray, Mem. Am. Acad. II. 4: 89. 1849. 

 Dyssodia Wrightii B. L. Robinson, Proc. Am. Acad. 49: 508. 1913. 



A glabrous perennial herb; stems 2-4 cm. high, several from the persistent base, branched 

 above; leaves opposite or alternate, 2-5 cm. long, linear and entire or divided below into linear 

 divisions, spinulose-tipped ; peduncles 5-8 cm. long; involucre hemispheric, 6-7 mm. high, 

 8-12 mm. broad, with a calyculum of 1-5 lance-subulate small accessory bracts; principal bracts 

 18-22, in two series, united to the ovate tips, the glands usually 2, conspicuous; ligules 4 mm. 

 long, 2 mm. wide, yellow; disk-corollas 3 mm. long; tube shorter than the trumpet-shaped 

 throat; lobes ovate; achenes 3.5 mm. long, strigose, slightly hirsutulous; squamellae 10, all 

 awned, some of them 3-awned. 



Type locality: Between Rio Colorado and Rio Guadalupe, Texas. 

 Distribution: Texas. 



8. Thymophylla tenuiloba (DC.) Small, Fl. SE. U. S. 1295. 1903. 



Hymenatherum tenuilobum DC. Prodr. 5: 642. 1836. 



Hymenatherum tenuifolium A. Gray, PI. Wright. 1: 118. 1852. Not H. lenuifolium Cass. 1821. 



Dyssodia tenuiloba B. L. Robinson, Proc. Am. Acad. 49: 508. 1913. 



A puberulent perennial; stems diffusely branched, 1-2 dm. high; leaves mostly alternate, 

 2-3 cm. long, pinnatifid, with 9-13 filiform, spinulose-tipped segments; peduncles 3-5 cm. long; 

 involucre turbinate, 5-6 mm. high, 7-8 mm. broad, with a calyculum of 3-6 lanceolate bracts 

 1-2 mm. long; principal bracts 15-20, linear-oblong, united to near the tips, practically in one 

 series, the deltoid or ovate lobes erose, scarcely overlapping, with 1-5 conspicuous glands, 

 perfectly glabrous; ligules oblong, 3-4 mm. long, 1.5 mm. wide; disk-corollas 2.5 mm. long; tube 

 shorter than the trumpet-shaped throat; lobes ovate; achenes 3 mm. long, hispidulous on the 

 angles; squamellae 10, nearly alike, 2 mm. long, all or most of them 3-awned, the middle 

 awn much longer. 



Type locality: Near Bexar, Texas. 

 Distribution: Texas and Coahuila. 



