252 COMPOSITAE 
2. Dyssodia codperi A. Gray. Cooper’s Dyssodia. Fig. 5414. 
Dysodia coopert A. Gray, Proc. Amer. Acad. 9: 201. 1874. 
Lebetina cooperi A. Nels. Bot. Gaz. 47: 435. 1909. 
Clomenocoma cooperi Rydb. N. Amer. Fl. 34: 166 1915. 
Clomenocoma laciniata Rydb. loc. cit. 
Tll-smelling sh rubby perennial 34.5 dm. high with numerous striate, a scabridous or 
seabridulos stems bein ing leafy ascending branches arising from a woody base. Leaves alternate, 
about i od 2 cm. lo re) 
gla 
10 mm. long; disk-corollas about as long as the ; achenes striate, 6-7 m m. high, oe te 
maturity, pappus-paleae 10-15, mos ay lorie? tan’ the achene, dissected into ial bri 
ocky slopes and gravelly alluvial fans, Lower Sonoran Zone uthe Nevada and the sia Death 
Va — region, California, and Mohave County, Arizona, to the eiuth oon 5 oa Se of the Mojave Desert, San 
oo Nanne eas eat he Type locality: on the eastern side of the Providence Mountai ns, California. 
uly, 
3. Dyssodia thirberi (A. Gray) Robinson. Thurber’s Dyssodia. Fig. 5415. 
Hymenantherum tenuifolium var. A. Gray, Smiths. Contr. 5: 93. 1853 
Hymenantherum thurberi A. Gray, Proc. Amer. Acad. 19: 41. 18 
Dysodia _— A. Nels. Bot. Gas, 47: 435. 9. 
Dysodtia thurberi A. Nels. op. cit. 436, oe 
Dyssodia Durheed Robinson, pA Amer. Acad. 49: 508. "1913. 
Pubescent perennial 1-2 dm. high with — slender, ee densely leafy, branching stems 
arising directly from the perennial root or from a woody caudex. Leaves opposite, sessile, rigid, 
sparsely beset vith glands, 9-16 mm. Sie cincatet pad: nearly to the zaidrib into 3-7 acicular, 
eichuel ie divisions, the cous thus appearing fascicled; heads many, terminating the branchlets, 
the slender peduncles ong ; involucres turbinate-campanulate, 4-5 mm. high, the calyculate 
bractlets few, short, the 2 se series Oi phyllaries united to near the apex, coriaceous, thinner above, 
the outer linear series ciliate along the free margin, ~ series port pens small mAbs glands; rays 
yellow, oblong to oval, about 3 mm. long ; disk-flowers about m. long ; achenes 2-3 mm. long 
sparsely hispidulous wt gtaae bas as about 10, about eat tee hea] in Menctt the paleae ali 
- or 
ravelly or rocky slopes, often growing on limestone, Sonoran Zone Ss; southern Nevada and eastern San 
Bernardino County, California, eastward through Arizona to western Texas; ’also adjacent Mexico. Type locality: 
near El — Texas. _ —Sept. 
pa a ent.) Hitche. Trans. Acad. St. Louis 5: 50 a” 1891. (Tagetes papposa Vent. Descr. 
Fok Cels “rg 1801; Dyssodia ge tata Cav. Descr. 202. 1802: Boebera tn oes ye rd Willd. 
Sp. a he 2425. ieee 2 papposa Rydb. ex Britt. Man. 1012. 1901.) Hieapnted, muc eh tre net, leafy annual, 
the leaves mostly opposite, pinn atifid or Bipineatiéd with linear eeession ns; i involucres subtended by near bractle' ets, 
these and the phyllaries bearing a few conspicuous, linear or elliptic glands; achenes pubescent, the pappus-paleae 
dissected into bristles. 
Roa pace: Recrge' sate, and cultivated areas; collected by Roos (5056) at Loma Linda , San Bernardino 
Coots, fi nia, not = et well established; widespread as a weed from Illinois west to Montana and 
rizona. Type ie rn Tilinoi 
67. POROPHYLLUM [Vaill.] Adans. Fam. Pl. 2: 122. 1763. 
Annual or perennial herbs or often low shrubs. Leaves simple, alternate or opposite 
with marginal oil glands, these sometimes present on the surface of the leaves. Heads 
discoid, solitary on the branches. Involucres cylindric or campanulate, the phyllaries in 
1 series, 5-9, oblong, equal, bearing oil te nds. Flowers perfect, fertile, purplish or yellow. 
Throat of the corolla funtncltg orm, longer or shorter than the tube, the lobes reflexed, often 
irregularly cleft. Anthers rounded at hale. Style-branches conspicuous, slender, hirsutu- 
ous, the apices subulate. Achenes slender, striate. Pappus of many scabrous or hirsutulous 
hues [From the Greek meaning pore and leaf, OF ses to the translucent oil glands. ] 
A genus of about species, nati f th 
sities ode Prone Re ves of southwestern United States, Mexico, and South America. Type 
1. Porophyllum gracile Benth. Odora. Fig. 5416. 
phytilum gracile Benth. Bot. Sulph. 29. 1844 
Porophyllum junciforme apg — Bot, Che 2: 354. 191%. 
Porophyllum vaseyi Greene 
Porophyllum caesium ao 155. 
Bushy perennial, woody at base, 2 dm. high, with many slender, erect, rush-like branches; 
herbage dark green, often pu shetty glaucous, with a gig oat me reeable odor ie the scattered 
oil glands. Leaves few, li linea ar-filiform, entire, 1-5 cm. g; involuc wly campanulate, 
10-15 mm. long; phyllaries 5, often tinged with purple, oil a. a Tinear- one obtuse, the 
hyaline margin often pinkish, r Sierra = the back and somewhat gibbous at the base; corollas 7-8 
mm. long, purplish white with purple lines, throat funnelform = ace cxocedine the tube, puberulent ; 
—_— ee — . long, ‘taal “orton the pappus shea 6 6 mm. long, of coarse, hispidulous, often 
