Part 2, 1915] CARDUACEAE : TAGETEAE 173 



terminal and 2 lateral glands; ray-flowers about 10; ligules yellow, 5 mm. long, 3 mm. wide, 



with 5-7 rather strong nerves; disk-corollas yellow, 3 mm. long; tube shorter than the narrowly 



cylindro-funnelform throat; lobes lanceolate; achenes 2.5-3 mm. long, angled, striate, hir- 



sutulous on the ribs; pappus 2.5 mm. long; squamcllae 18-20, all awned and some of them 



3-awned. 



Type locality: Pass of the Limpia, Texas. 



Distribution: Western Texas, New Mexico, Chihuahua, Zacatecas, and Coahuila. 



2. Thymophylla diffusa (A. Gray) Rydberg. 



Hymenathenim diffusum A. Gray, PI. Wright. 1: 116. 1852. 

 Dyssodia diffusa B. L. Robinson. Proc. Am. Acad. 49: 507. 1913. 



A glabrous annual; stem diffuse or decumbent, 1-2 dm. long; leaves alternate or opposite, 



1-3 cm. long, pinnatifid, with filiform divisions; peduncles 1-3 cm. long, minutely bracteolate; 



involucre turbinate, 5 mm. high, 7 mm. broad, without accessory bracts; ligules oval, 4 mm. 



long; disk-corollas 3 mm. long; tube shorter than the elongate-funnelform throat; lobes ovate; 



achenes slender, 3 mm. long, hispidulous; squamellae 10, narrowly oblong, 3-toothed, the middle 



tooth long-awned, the lateral ones awn-pointed, and erose-laciniate on the margins. 



Type locality: Mexico. 

 Distribution: Chihuahua. 



3. Thymophylla tenuifolia (Cass.) Rydberg. 



Hymenatherum tenuifolium Cass. Diet. Sei. Nat. 22: 314. 1821. 

 Dyssodia tenuifolia Loesener, Bull. Herb. Boiss. II. 6: 866. 1906. 



A glabrous annual; stem diffusely branched, 1-2 dm. high; leaves mostly alternate, 2-3 

 cm. long, pinnatifid into 7-11 filiform divisions; peduncles 2-4 cm. long, minutely bracteolate; 

 involucre turbinate, 5 mm. high, 6-7 mm. broad, without calyculum; bracts about 15, 

 oblanceolate, with broad, abruptly short-acuminate tips and 3-5 more or less raised glands; 

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

 funnelform throat; lobes ovate ; achenes slender, angled, 2 mm. long, hispidulous; pappus usually 

 double; principal squamellae 10, about 2.5 mm. long; body oblong or ovate, 3-toothed at the 

 apex, the middle tooth long-awned, the lateral ones awn-pointed; accessory outer squamellae 

 1-3, minute, subulate. 



Type locality: Chile, but the specimen of uncertain source. 

 Distribution: San Luis Potosi to Mexico (State). 



4. Thymophylla anomala (Canby & Rose) Rydberg. 



Hymenatherum anomalum Canby & Rose; Rose, Contr. U. S. Nat. Herb. 1: 105. 1891. 

 Dyssodia anomala B. L. Robinson, Proc. Am. Acad. 49: 506. 1913. 



A slender annual; stem 1.5-5 dm. high, glabrous or nearly so; leaves opposite or alternate, 



2-4 cm. long, pinnatifid into 7-9 filiform segments with conspicuous glands; peduncles 4-7 



cm. long; involucre hemispheric, without calyculum, 5 mm. high, 7-8 mm. broad; bracts in 



2 series, equal, oblanceolate, acute, almost free, with 1-5 oblong oil-glands; ray-flowers about 



10; ligules oblong, about 1 cm. long; disk-corollas 3 mm. long; tube shorter than the 



trumpet-shaped throat; lobes ovate; achenes 2 mm. long, angled and striate, slightly hirsute; 



pappus double, each series of about 10 squamellae, the inner 3-toothed, the middle tooth 



long-awned, the lateral ones awn-tipped; outer squamellae merely erose-laciniate. 



Type locality: Base of Alamo6 Mountains, Sonora. 

 Distribution: Sonora. Sinaloa, and Durango. 

 Illustration: Contr. U. S. Nat. Herb. 1: pi. 7. 



5. Thymophylla Neaei (D£.) Rydberg. 



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

 Hymenatherum boeberoides A. Gray, PL Wright. 1: 115. 1852. 

 Dyssodia Neaei B. L. Robinson, Proc. Am. Acad. 49: 507. 1913. 



A glabrous annual; stems diffusely branched from near the base, ascending; leaves 2-3 

 cm. long, mostly alternate, pinnatifid into linear-filiform divisions; peduncles 1-3 cm. long; 

 involucre turbinate-hemispheric, 5 mm. high, 7-S mm. broad, without calyculum; bracts 



