WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 
Plants 30 cm. high or more, corymbosely 
branched at the middle or above, stout; 
stems coarsely striate.........----.----- 
Plants low, 10 to 14 cm. high, diffusely 
branched from or near the base, slender; 
stems smooth 
Pubescence spreading. 
Stems simple below........----------+--+---+-- 15. 
Stems branched from the base. 
Rays white; stems spreading........-.-------- 
Rays purplish; stems erect or ascending 
Perennials. 
Leaves dissected or deeply cleft. 
Rays purple; stems low, less than 10 cm. high, scapi- 
en 
Rays white or pinkish; stems tall, not scapiform. .. 
Leaves entire or slightly toothed. 
Stems low, less than 20 cm. high, scapiform, usually 
bearing a single head. 
Involucres and peduncles long-villous. 
Involucres and peduncles with black purple 
hairs. .....---ece cece cece cece reece cere eee 20. 
Involucres and peduncles white-hairy. 
Plants 5 to 8 cm. high; disk 10 to 12 mm. 
en ee 
ee 
Involucres and peduncles hirsute to glandular- 
puberulent or glabrate, never long-villous. 
Leaves and stems glabrous or nearly so; leaves 
spatulate 
Leaves and stems pubescent; leaves much nar- 
rower. 
Heads 12 to 13 mm. high................----- 
Heads 6 mm. high or less. 
Leaves linear-filiform; pubescence of the 
stems appressed 
a) 
Leaves linear; pubscence of stemsspreading . 26. 
Stems taller, 20 to 100 cm. high, usually with several 
to numerous heads, not scapiform. 
Stems densely cespitose from a thick tap-root; 
heads small, the disk usually less than | cm. 
wide. 
Rays wanting.......-.-.-+-+-++++-eeee eee eee 
Rays present. 
Pappus double; stems hirsute........------- 
Pappus uniseriate; stems strigose..........-- 
Stems usually solitary from the ends of simple or 
branched rootstocks; heads larger, the disk 
usually more than 1 cm. wide. 
Bracts loose, with reflexed tips; rays broad; pap- 
pus uniseriate. 
Bracts villous; rays white........-..-------- 
Bracts glandular-puberulent; rays purplish. .31 
27. 
-28. 
29. 
SEs) 
E 
E. 
E 
E 
675 
13. E. bellidiastrum. 
. eastwoodiae. 
wootont. 
. arenarius. 
. divergens. 
. pinnatisectus. 
. neomexicanus. 
. melanocephalus. 
E. uniflorus. 
E. leucotrichus. 
. E. 
E. 
E. 
E. 
. leiomerus. 
. grayt. 
. nematophyllus. 
vetensis. 
aphanactis. 
concinnus. 
eatont. 
coulteri. 
. E. salsuginosus. 
