COMPOSITE. (COMPOSITE FAMILY.) 197 



commonly or f the length of disk-corolla. From Arizona to British 

 Columbia and eastward across the continent. 



56. GAILLABDIA, Fougeroux. 



Herbs, with alternate leaves, and ample shoAvy heads on terminal peduncles. 

 Ours are more or less pubescent or hirsute and leafy-stemmed, with yellow 

 rays and disk-flowers apt to turn brown, villous akenes, and scales of the pap- 

 pus slender-awned. 



1. G. aristata, Pursh. More or less hirsute, often 2 feet or more high : 

 leaves lanceolate or broader, or lower spatulate./rora entire to laciniate-dentate or 

 sinuate-pinnatifid : rays in the largest heads l inches long : lobes of disk-corolla 

 subulate-acute and tipped with a cusp : pappus aristate. From New Mexico 

 and S. Colorado to Oregon, British Columbia, and the SaskatcheAvan. 



2. G. pinnatiflda, Torr. Cinereous-pubescent: peduncles scapiform or 

 from short leafy stems, 5 to 10 inches long: some or even all the leaves pinna- 

 tifid, sometimes linear or with linear lobes, sometimes spatulate and sinuate 

 or even entire : teeth of the disk-corolla short and broad, obtuse, pointless: pappus- 

 scales lanceolate. On the plains, Colorado and Arizona to W. Texas. 



57. PLAVERIA, Juss. 



Glabrous herbs ; with small and fascicled or glomerate heads of yellowish 

 or yellow flowers, and opposite sessile leaves; akenes mostly smooth and 

 glabrous. 



1. P. angustifolia, Pers. Erect, a foot or two high : leaves from linear 

 to lanceolate, serrulate or entire, sessile by broadish or little contracted base : 

 heads in subsessile or short-pedunculate or leafy-involucrate chiefly terminal 

 glomerules: involucre of mostly 3 bracts, 3 to 5-flowered or some only 2- 

 flowered. Alkaline soil, E. Colorado and New Mexico to W. Texas. 



58. DYSODIA, Cav. FETID MARIGOLD. 



Herbs, mostly strong-scented, Avith alternate or opposite leaves, and solitary 

 or somewhat paniculate heads of yellow floAvers. Ours has an involucre with 

 accessory bracts, pubescent akenes, and opposite pinnately divided leaves. 



1. D. Chrysanthemoides, Lag. Much-branched and ill-scented annual, 

 leafy up to the subsessile or short-pedunculate small heads : leaves 1 to 2-pin- 

 nately parted into linear lobes : involucre purplish-tinged or greenish, of 8 or 

 10 scarious-tipped oblong bracts, and some linear loose accessory ones : rays 

 few and inconspicuous, not surpassing the disk. From Arizona and Colorado 

 to Minnesota and Louisiana, and now spreading eastward to the Atlantic 

 States. 



59. HYMENATHERUM, Cass. 



Low herbs, mostly pleasant-scented ; with alternate or opposite leaves, and 

 rather small radiate heads of yelloAv flowers. Our species is wholly glabrous. 



1. H. aureum, Gray. A span or two high, erect or diffuse, much 

 branched, bearing numerous short-peduncled heads : leaves mostly alternate, 



