FAMILIES OF PLANTS 
127 
15. Leaves clasping by a heart-shaped base. Erigeron philadelphicus. 
15. Leaves not clasping by a heart-shaped base. 1G. 
16. Leaves mostly linear and less than an inch long. Erigeron diver gens. 
16. Leaves broader and more than an inch long. 17. 
17. Leaves 3-nerved. Rays blue or violet. Erigeron corymbosus. 
17. Leaves 1-nerved. Rays pinkish. Erigeron caespitosus . 
In addition to the above species Erigeron howellii , E. micro- 
lonchus , and E. minor have been reported as occurring in the park. 
Pussytoes or Everlasting (Antennaria) .-—More or less woolly or 
white-hairy plants with alternate leaves and usually a number of 
rather small heads. There are no ray flowers, and the disk flowers 
are whitish so that the heads are usually not very conspicuous. 
They are found at all elevations but are especially abundant above 
timberline. Many of the species are very much alike in general 
appearance, but those found in the park may be distinguished by 
anyone wishing to do so by 
means of the following key: 
1. Plauts not spreading by leafy 
stolons or short runners. 2. 
1. Plants spreading by leafy 
stolons or short runners. 3. 
2. Plants more than a foot high. 
Bracts of the involucre 
somewhat woolly. Anten¬ 
naria puleherrinia. 
2. Plants 4 to 10 inches high. 
Bracts of the involucre 
nearly smooth. Antenna¬ 
ria oblanceolata. 
2. Plants less than 4 inches 
high, forming dense tufts 
or mats. Antennaria 
dimorpha . 
3. Leaves more than an inch long. Antennaria racemosa. 
3. Leaves less than an inch long. 4. 
4. Tips of the involucral bracts green or brown. 5. 
4. Tips of the involucral bracts rose color. 7. 
4. Tips of the involucral bracts white. 8. 
5. Stems less than 3 inches high, very slender. Antennaria media. 
5. Stems more than 3 inches high. 6. 
6. Leaves woolly. Antennaria reflexa. 
6. Leaves white-hairy but not woolly. Antennaria umbrinella. 
7. Leaves nearly oblanceolate and sharp-pointed. Pink pussytoes ( Antennaria 
rosea). 
7. Leaves spatula-shaped, blunt-pointed. Antennaria concinna. 
8. Stems scarcely more than 4 inches high. Leaves usually folded lengthwise. 
Antennaria arida. 
8. Stems usually more than 4 inches high. Leaves not folded. 9. 
9. Leaves narrowly oblanceolate. Antennaria corymbose. 
9. Leaves spatula-shaped. Antennaria parvifolia. 
Figure 103.—Pussytoes or Everlasting-. Whitish. 
Photograph by Joseph S. Dixon, National Park 
Service. 
