FLOWERIXG PLANTS AXD FERNS OF ARIZONA 941 



few, thin, equal phyllaries; rays 1 to 5, fertile; disk flowers hermaphro- 

 dite, sterile; receptacle paleaceous; achenes oblong, epappose. 



1. Guardiola platyphylla A. Gray, PL Wright, 2: 91. 1853. 



Huachuca Mountains (Cochise County) to the Santa Catalina and 

 Baboquivari Mountains (Pima County), also Slate Creek (western 

 Gila County), 2,800 to 4,500 feet, canyons, February to September. 

 Southern Arizona and northern Mexico. 



A specimen in the U. S. National Herbarium, labeled as collected 

 near Holbrook, Navajo County, by Myrtle Zuck, probably came from 

 the vicinity of Tucson. 



40. MELAMPODIUM"* 



Low herbs; leaves opposite, entire to pinnatifid; heads small or 

 medium-sized, radiate; outer phyllaries 4 or 5, herbaceous; inner 

 phyllaries of the same number as the rays, completely enclosing the ray 

 achenes like a coat and falling with them; rays white or yellow, pistil- 

 late, fertile; disk flowers hermaphrodite, sterile; receptacle paleaceous: 

 achenes obovate-oblong; pappus none. 



Key to the species 



1. Rays white, often purplish-veined, conspicuous, 6 to 15 mm. long; plant 

 perennial; heads 10 to 30 mm. wide, on peduncles usually 2 to 10 cm. 



long 1. M. LEUCAXTHUM. 



1. Rays yellow, inconspicuous, usually not more than 2 mm. long; plants annual: 

 heads only 2 to 6 mm. wide, usually sessile or subsessile (2). 

 2. Fruit with a raised hood at apex, this usually prolonged into a recurved, 



dorsally pilosulous beak up to 2 mm. long 2. M. loxgicorxe 



2. Fruit (achene with the tightly enwrapping inner phyllary) not hooded o* 

 beaked at apex 3. M. hispidum 



1. Melampodium leucanthum Torr. and Gray, Fl. North Amer. 2: 271 



1842. 



Fort Apache (southern Navajo County), to Kingman (Mohave 

 County), south to Cochise and Pima Counties, 2,000 to 5,000 feet, 

 common on dry rocky slopes and mesas, often on limestone, March to 

 October. Kansas to Texas, southern Arizona, and Chihuahua. 



A showy and attractive plant. 



2. Melampodium longicorne A. Grav, Amer. Acad. Arts and Sci. 



Mem. ser. 2, 5: 321. 1854. 

 Mountains of Cochise and Santa Cruz Counties, 4,000 to 5,500 feet, 

 canyons, often on limestone, August and September. Southeastern 

 Arizona and northern Mexico. 



3. Melampodium hispidum H. B. K., Nov. Gen. et Sp. 4: 273. 1820. 

 Cochise, Santa Cruz, and Pima Counties, 4,000 to 5,000 feet. 



August and September. Southern Arizona and Mexico. 



41. BERLANDIERA 



Perennial herb, finely canescent-tomentulose; leaves alternate, 

 lyrate-pinnatifid or merely crenate; heads rather large, radiate, yellow, 

 solitary, long-peduncled; involucre broad, about 3-seriate, the phyl- 



: ' Reference: Robinson, B. L. synopsis of the genus melampodium. Amer. Acad. Arts and Sci. 

 Proc. 36 (Gray Herbarium Contrib. 20): 455-466. 1901. 



