1540 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



3. Aspilia rosei Greenm. Proc. Amer. Acad. 40: 39. 1904. 



Tepic and Durango; type collected between Santa Gertrudis and Santa Teresa, 

 Sierra Madre of Tepic. 



Suffrutescent, about 30 cm. high, hispidulous and hispid-hirsute; leaves short- 

 petioled, linear to elliptic-lanceolate, 2 to 5 cm. long, 4 to 10 mm. wide, revolute- 

 margined, subentire; heads solitary at tips of stems and branches, about 2 cm. 

 wide; involucre subequal. 



4. Aspilia strigosa (Hook. & Arn.) Benth. & Hook.; Hemsl. Biol. Centr. Amer. 



Bot. 2: 171. 1881. 



Wedelia strigosa Hook. & Arn. Bot. Beechey Voy. 435. 1840-41. 



Guerrero and "Veracruz;" typQ from Acapulco, Guerrero. 



Suffrutescent (?), probably about 1 meter high, hispidulous and sparsely 

 hispid; leaf blades 4 to 6.5 cm. long, 1.7 to 2.3 cm. wide, acuminate, harsh above, 

 rather softly pubescent beneath; heads 1 to 3 at tips of stem and branches, about 

 1.8 cm. wide. 



5. Aspilia purpurea Greenm. Proc. Amer. Acad. 40: 39. 1904. 

 Aspilia .scabrida T. S. Brandeg. Univ. Cahf. Publ. Bot. 10: 420. 1924. 

 Chiapas; type from Valley of Jiquipilas. 



Suffrutescent, about 40 cm. high, strigose, spreading-hispid toward base; 

 leaves oval to elliptic, 2.2 to 5 cm. long, 0.8 to 2 cm. wide, acute, short-petioled 

 or subsessile, serrate or serrulate; heads solitary, long-peduncled, about 3 cm. 

 wide; flowers all purple. 



6. Aspilia aggregata Greenm. Proc. Amer. Acad. 39: 102. 1903. 



Known only from the type locality, between Bolanos and Guadalajara, Jalisco. 



Suffrutescent (?), about 0.5 meter high; stem and branches slender, tubercu- 

 late-strigose; leaves short-petioled, elliptic, 2.5 to 4 cm. long, 5 to 10 mm. wide, 

 acute, serrulate, sparsely tuberculate-hispid on both sides; heads small, discoid, 

 about 9 mm. high, in close clusters of about 2 to 5 apex of long naked peduncles; 

 phyllaries acuminate, purplish, densely brownish-ciliolate or -ciliate, on back 

 somewhat strigose and strigillose. 



60. TITHONIA Desf.; Gmel. Syst. Nat. 1259. 1791. 

 Reference: Blake, Revision of the genus Tithonia, Contr. U. S. Nat. Herb. 

 20: 423-436. 1921. 



Herbs or shrubs; leaves alternate, or opposite below; heads radiate, yellow, 

 large, borne on fistulose peduncles; involucre (in the following species) 4-seriate, 

 strongly graduate, the phyllaries broad; rays neutral; achenes plump; pappus of 

 free or connate squamellae, with or without awns, or entirely wanting. 

 Pappus present. 



Leaves unlobed; stem densely and canescently pilose-tomentose. 



1. T. fruticosa. 

 Leaves usually 3 or 5-lobed; stem not canescently pilose-tomentose. 



2. T. diversifolia. 

 Pappus wanting 3. T. scaberrima. 



1. Tithonia fruticosa Canby & Rose, Contr. U. S. Nat. Herb. 1: 104. pi. 5. 



1891. 



Sonora and Sinaloa to Chihuahua and Durango; type from Alamos, Sonora. 



Stout shrub, 3 or 4 meters high; leaf blades ovate or lanceolate, 6.5 to 30 cm. 

 long, 2.2 to 14 cm. wide, rather softly and densely canescent-pilose; heads 7 to 

 9.5 cm. wide; pappus a paleaceous crown, the awns obsolete or represented by 

 short teeth. 



2. Tithonia diversifolia (Hemsl.) A. Gray, Proc. Amer. Acad. 19: 5. 1883. 

 Mirasolia diversifolia Hemsl. Biol. Centr. Amer. Bot. 2: 168. pi. Ij.7 . 1881. 



