466 CocKERELL: NortH AMERICAN SPECIES OF HYMENOXYS 
5. Heads larger. (Northern California and western Nevada.) 4. Lemmoni. 
Heads smaller. (Eastern Nevada, Utah and northern Arizona). 
H. Lemmoni Greenet. 
Subgenus Picradenidia subg. nov. 
Cauline leaves elongate-oval, large, entire, pointed apically, strongly punctate ; heads 
very large, very convex; rays large and conspicuous; inner bracts with long 
pointed tips; receptacle high-conical; pappus-scales long-pointed, (Southern 
California.) Type and only species, H. /atissima., 
Subgenus Phileozera (Buckley, 1862) 
Annuals (rarely ae usually much spreading, with numerous heads ; foliage and 
rowth 
sugges of Anthemis ‘or Matricaria ; inner bracts not very different 
from outer, not atic uptly contracted apically, or copiously fringed; pappus- 
scales long-pointed ; disc-corollas distinctly expanded at mouth 
1. Heads very large, up to 15 mm. broad (excl. rays 
eads much ay usually not over 8 mm, broad fae rays), often smaller. 
2. Heads rather larger; inner bracts narrow and long-pointed. ee ania bee 
land. TY 6 
Heads rather smaller; bracts broader; plant of laxer Seesath: aa olive-green 
li 
foliage. (Vicinity of Yuma, Arizona. ) Al, chrysanthemotdes excurrens. 
. 3. Biennial. (Arizona, ) H. Da —_— 
Annual. 
4. Plant large and bushy, often about 45 cm. ese or more ; heads (excl. ns 
iameter, sometimes rather les 
Plant quite s ‘ill, much less than 20 cm. hi . ; heads usually smaller. 6. 
5. Plant typically larger; bracts broader. (State of Chihuahua, Mexico, extreme 
western Texas, southern New Mexico, southern Arizona. ) 
. chrysanthemoides juxta. 
Plant lanes smaller (about 21 cm. high) ; bracts narrower. (Otero Co., 
eee) chrysanthemoides Osterhoutt. 
6. Plant many-stemmed and densely leafy, eos 10 cm. high, heads (excl. rays) 
about 8 mm, broad, rays broad. (Dog Spring, veinetie New Mexico. 
Arysanthemoides Mearnsi. 
Not nearly so densely tufted, usually upright, as smaller heads. (Texas, 
except the extreme western part ; plains of eastern New Mexico, Oklahoma, 
western Kansas. ) H. chrysanthemoides multiflora. 
Subgenus Picradeniella subg. nov. 
Very small annuals, with some of the stem-leaves broad, with short lateral lobes, such 
leaves being unique in Hymenoxys ; receptacle very high and narrow ; pappus-scales 
long-pointed ; rays almost undeveloped, minute. Type and only species, /7. ¢exana- 
There is scarcely a species or variety of Picradenia which has 
not at one time or another been labeled “ Actinella Richardsoni”’ 
or ‘‘ Picadenia Richardsoni”’ by some competent botanist. It is 
hard to understand why this should be, since typical H. Richardsont 
does not appear to occur in the United States, and the plants 5° 
labeled are many of them extremely different from it, even in 
