1526 cbNTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Herbs or undershrubs with opposite entire leaves (in ours), and yellow, orange, 

 white, or rarely liver-colored, usually solitary, terminal heads; involucre several- 

 seriate, of strongly graduate, dry, subherbaceous-tipped phyllaries; rays fertile, 

 the ligules sessile, persistent, the achenes awnless or with 1 to 3 short awns; 

 disk fertile, the achenes strongly compressed, 2-toothed, 1 or 2-awned or awnless. 



The cultivated zinnias or youth-and-old-age of the gardens are Mexican and 

 South American species of this genus. 



Rays bright orange 1. Z. juniperifolia. 



Rays white, yellow, or liver-colored. 



Rays much shorter than the involucre, sometimes wanting 2. Z. anomala. 



Rays longer than the involucre. 



Leaves triplinerved; ligules 8 to 16 mm. long 3. Z. grandiflora. 



Leaves 1-nerved; ligules 12 mm. long or less. 



Body of disk achenes 3 to 3.5 mm. long 14. Z. acerosa. 



Body of disk achenes 2 mm. long 5. Z. pumila. 



1. Zinnia juniperifolia (DC.) A. Gray, PL Wright. 1: 105. 1852. 

 Diplothrix juniperifolia DC. Prodr. 5: 612. 1836. 



Crassina juniperifolia Kuntze, Rev. Gen. PI. 1: 331. 1891. 



Coahuila, Zacatecas, and San Luis Potosi; type from San Luis Potosi. 



Suflfruticulose, much branched, 30 cm. high or less, puberulous; leaves linear, 

 1.5 to 4 cm. long, 1 to 1.8 mm. wide, 3-nerved; peduncles usually elongate; heads 

 2 to 3.8 cm. wide. 



2. Zinnia anomala A. Gray, PI. Wright. 1: 106. 1852. 

 Crassina anomala Kuntze, Rev. Gen. PI. 1: 331. 1891. 



Coahuila and Zacatecas. Texas; type from prairies beyond the Pecos. 



Suffruticulose, about 12 cm. high; leaves hnear or linear-lanceolate, about 2 cm. 

 long, 3-nerved; phj'llaries densely ciliate; heads 1.5 cm. wide or less; ligules 

 "yellow" (?), apparently liver-colored; disk deep orange. 



3. Zinnia grandifiora Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 348. 1840. 

 Crassina grandifiora Kuntze, Rev. Gen. PL 1: 331. 1891. 



Sonora to Chihuahua artd Durango. Colorado to Arizona and Texas; type 

 from the Rocky Mountains. 



Suffruticulose, much branched, 20 cm. high or less; leaves linear, 2.5 cm. long 

 or less, 1 to 1.5 mm. wide; heads 2 to 3.2 cm. wide; rays bright yellow, very 

 showy, suborbicular; disk orange. 



4. Zinnia acerosa (DC.) A. Gray, PL Wright. 1: 106. 1852. 

 Diplothrix acerosa DC. Prodr. 5: 611. 1836. 



Crassina acerosa Kuntze, Rev. Gen. PL 1: 331. 1891. 

 Coahuila and San Luis Potosf; type from San Luis Potosi. Texas. 

 Similar to Z. grandifiora but smaller; leaves 1 to 2.5 cm. long, 1 mm. wide or 

 less; heads 1 to 2.5 cm. wide; rays pale yellow or white (?). 



5. Zinnia pumila A. Gray, Mem. Amer. Acad. n. ser. 4: 81. 1849. 

 Crassina pumila Kuntze, Rev. Gen. PL 1: 331. 1891. 



Sonora to Coahuila and San Luis Potosi; type from San Juan de la Vequeria 

 and Castaniola, Mexico. Texas to Arizona. 



Similar to Z. acerosa; leaves shorter, 16 mm. long or less; heads 1.2 to 1.8 cm. 

 wide; rays white or "pale yellow" (?); achenes smaller. "Hierba de burro" 

 , (Zacatecas.) 



i7. SA]Sr\^ITALIA Gualt. in Lam. "Journ. Nat. Hist. 2: 176. pi. 33. 1792." 

 1. Sanvitalia fruticosa Hemsl. BioL Centr. Amer. Bot. 2: 155. 1881. 

 Puebla and Oaxaca; type from Tehuacdn, Puebla. 



