COMPOSITE. (COMPOSITE FAMILY.) 191 



* * Lobes of disk-corollas ovale or oblong, decidedly shorter than the throat : 

 pappus shorter and coroniform or obsolete : very leafy below, sending up long 

 and naked peduncles : outer involucre short. 

 3. T. subnudum, Gray. Rather stout : leaves thickish and rigid, once 

 or twice ternately parted into linear or lanceolate lobes: peduncles 4 to 10 

 inches long: head £ inch high: rays sometimes none, sometimes ample: pap- 

 pus a minute 4 to 5-toothed naked crown, or obsolete. — Proc. Am. Acad. x. 

 72. Green River, Wyoming, Parry ; mainly in New Mexico, N. Arizona, and 

 S. Utah. 



45. MADIA, Molina. Tarweed. 



Glandular and viscid herbs, mostly heavy-scented : with entire or merely 

 toothed leaves, some or all of them alternate: heads axillary and terminal. 

 Ours belongs to the § Eumadia, in which the rays are few and inconspicuous 

 or none and the pappus none. 



1. M. glomerata, Hook. A foot or so high, rigid, very leafy, hirsute, 

 glandular only toward the inflorescence : leaves narrowly linear: heads glom- 

 erate • rays 2 to 5 or sometimes none, not surpassing the about equal 

 number of disk-flowers : akenes narrow, those of the disk 4 to 5-angled ; 

 of the ray somewhat curved and 1-nerved on each face. — Mountains of 

 Colorado, to the Saskatchewan, the Sierras of California, Oregon, and 

 Washington. 



46. LAYIA, Hook. & Am. 



Branches terminated by showy heads of (in ours) white flowers : pappus of 

 10 to 20 stout bristles, which are plumose below the middle : herbage hispid 

 or hirsute, somewhat viscid, above beset with scattered stipitate blackish 

 glands. 



1. L. glandulosa, Hook. & Am. A span to a foot or more high, dif- 

 fusely branched : lower leaves lanceolate or linear, laciniate-pinnatifid or 

 incised, upper narrow and entire : rays 8 to 13, large and conspicuous (bright 

 white or tinged with rose), .j to £ inch long, 3-lobed : villous hairs of the pap- 

 pus bristles copious, the outer straight and erect, the inner soon crisped and 

 interlaced into a woolly mass. — Barren ground, from New Mexico through 

 S. W. Colorado to Idaho, and westward. 



47. RIDDELLIA, Nutt. 



Low and corymbosely branched woolly herbs : with alternate and spatulate 

 or linear leaves, the cauline entire: small heads of yellow flowers: bracts 

 of the involucre distinct, but connected by the intricate wool so as to seem 

 connate. 



1. R. tagetina, Nutt. Loosely or somewhat villosely laiiate, sometimes 

 glabrate in age, rather widely branched : radical and even lower cauline leaves 

 often laciniate-pinnatifid: heads numerous, mostly cymosely clustered and 

 short-peduncled : scales of the pappus oblong-lanceolate, entire, usually obtuse, 

 ^ or f the length of the disk-corolla. — W. Texas to E. Colorado, and Arizona 



