FLOWERING PLANTS AXD FERNS OF ARIZONA 937 



35. ANTENNARIA. Pussytoes 



Dioecious, dwarf, tomentose, stoloniferous, perennial herbs, rarely 

 siiffriiticulose; leaves mostly in a basal rosette, small, entire, obovate 

 or spatulate, those of the stem reduced; heads rather small, discoid, 

 strictly staminate or pistillate; involucre strongly graduated, of 

 scarious phyllaries; pistillate corollas filiform; hermaphrodite (func- 

 tionally staminate) corollas tubular, 5-toothed, whitish; achenes small; 

 pappus of the pistillate flowers of copious capillary bristles, united at 

 base and deciduous in a ring; pappus of the staminate flowers of more 

 or less clavellate and slightly flattened bristles. 



In many species of this genus parthenogenetic reproduction is the 

 rule, and staminate plants are very rare; they are common, however, 

 in A. rosulata and A. marginata. 



Key to the species 



1. Heads sessile or subsessile among the leaves of the basal rosettes, solitary or 2 

 or 3 together 1. A. rosulata. 



1. Heads capitate or closely cymose at the tips of erect stems, these normally 5 cm. 

 high or more (2). 

 2. Leaves soon glabrate and green above ;inflorescence finely stipitate-glandular. 



2. A. MARGINATA. 



2. Leaves persistently tomentose above; inflorescence not glandular (3). 



3. Pistillate heads 8 to 10 mm. high or more; basal leaves usually 5 to 9 mm. 



wide 3. A. aprica. 



3. Pistillate heads less than 8 mm. high; basal leaves usuallv 4 mm. wide or 

 less (4). 

 4. Phyllaries blackish green or fuscous toward the base, or nearly through- 

 out 4. A. UMBRINELLA. 



4. Phyllaries greenish or light brown at base, otherwise white. 



5. A. ARIDA 



1. Antennaria rosulata Rydb., Torrey Bot. Club Bui. 24: 300. 1897. 

 Rim of the Grand Canyon, San Francisco Peaks, Flagstaff (Coco- 

 nino County), mostly 5,500 to 8,000 feet, May and June. Colorado, 

 Utah, and Arizona. 



2. Antennaria marginata Greene, Pittonia 3: 290. 1898. 



Antennaria recurva Greene, Pittonia 3: 290. 1898. 

 Antennaria marginata var. glandvlijera A. Nels., TVvo. Univ. 

 Pub. Bot. 1: 134. 1926. 



White Mountains (Apache County) and Coconino County to the 

 mountains of Cochise and Pima Counties, 5,000 to 9,000 feet, rocky 

 slopes and ridges, April to July, type of A. recurva from Flagstaff 

 (MacDougal in 1891), type of A. marginata var. glandvlijera from 

 Schultz Pass, near Flagstaff (Hanson 635). Colorado, Utah, and 

 Arizona. 



The type of Antennaria recurva, which is very immature, is one of 

 the occasional specimens of this species in which the leaves remain 

 tomentose above. 



3. Antennaria aprica Greene, Pittonia 3: 282. 1898. 



Coconino, Yavapai, Graham, Gila, and Pima Counties, from the 

 Kaibab Plateau to the southern mountains, 5,000 to 9.000 feet, 

 May to August. Manitoba to British Columbia, south to New 

 Mexico and central Arizona. 



