SUNFLOWER FAMILY 207 
47. HYMENOXYS Cass. Dict. Sci. Nat. 55: 278. 1828. 
1 or perennial, aromatic herbs from a simple taproot or branched root-crown, 
r 
simple-stemmed or branched, some scapose, variously pu nt ernate or basal 
only, entire or pinnately or ternately divided, mor less glandular-punctuate. Heads 
radiate or d d, pedu te, yellow-flowered. Involucres mostly hemispheric. Phyl- 
larie 2-3 serie e outer distinct or connate sid bie su al to noticeably different 
in length, herbaceous or pa nous in age and e ceptacle mostly naked, convex 
or low-conic or he heric. Ray-flowers pistillate, posi ve ‘aegel rays prominently veined, 
3-toothed at apex in oe or os after floweri 
n- 
ers entire or sagittate at base, l short, the tips triangular or rounde le- 
branches tened, neate, minutely penicillate. Achenes obpyramidal, more or less 
-angled, densely appressed-hairy. Pappus-paleae usually 5 (in ours), hyaline, obscurely 
nerved or nerveless, the nerve oft uced i wn. [From the Greek words mean 
en pr 
ing membrane and sharp, referring to the paleae. 
A ye of 20 species = Fins’ natives of western North America and of South America. Type species, Hy- 
Jus 
Leaves entire, all basal; heads solitary on the nak 
acaulis arizon 
Leaves pinnately —— d 
a, 
into narrow divin: ay feast all the lowermost); heads numerous on the Scshiog 
inflore ae 
pe seer or ceca, branching only - st page tems 
pper and lower leaves with | .5 mm. or less wide. t 
ag: 3 eri. 
Uppermost leaves usually entire, the divisions of the basal and lower stem-leaves 2—3 mm. wide. 
3. H. lemmonii. 
Annuals, usually branching throughout. 4. H. odorata. 
1. Hymenoxys acailis var. arizonica (Greene) Parker. Arizona Hymenoxys. 
Fig. 5338. 
Tetraneuris arizonica Greene, Pittonia 3: 266. 1898. 
Actinea acaulis var. arizonica Bla e ex Munz, Man. S. Calif. 570. 1935. 
Hymenoxys acaulis var. ar izonica Parker, Madrofio 10: 159. 1950. 
nsely cespitose perennial with woody taproot and Pepe ti stout, much-branched caudex 
densely covered with the sie 2 see ene leaf-bases sag scapose stems 1-3 dm. high, striate, 
— s 2- 
thinly appressed-sericeou ea 5 cm. long, 2-5 mm. wide, basal, i wded, ‘thick, linear- 
abkakseeite,. ste! essed-s ind “neal vubeae tli ris apex, obscurely glandu lar; heads 
solitary, the involucres hemuapliet , 6-9 mm. high, about 10-15 mm. wide; phyllaries distinct, 
oblong ove. “thin nd scarious at leas e margins, villous ; receptacle enon 
1 need er ie glandular-dotted at the , veiny, refle in 
somewhat paper long, Levon at nerved ; pappus- — shorter than the 
achenes, hyaline, fiers “the midnerve extending a the body 
on in pinyon and juniper belt, upper part of Re bile T rides baer el ger EJ engs 90 Zones; 
estern Col orado and southern Utah to central and southern Nev south to the mountains o 
f San ae 
County, California, aad northern Arizona. Type locality: inten: Trumbull, Mohave County, pH month Collected 
by Pa mer. May-Jun 
5337. Gaillardia aristata 5338. Hymenoxys acaulis 
