14s 



I'KKKS AND SHRUBS 



Heads all alike of numerous perfect fl> 

 Heads radiate. 



Rays 5, very short, heads appearing discoid; 



flowers all white. 

 Rays conspicuous, heads rather large. 



yellott i in our Bpi rub 3 feet 



high or more. 

 Rays white (in our species) plant less than 

 1 foot high. 



V Fl-OfRENSIA. 



9. Pakthenilm. 



MN"!."MIA. 



-;na. 



Tribe VI. Helexieae. 



A single genus — with fleshy leaves. 12. Clappia. 



Tribe VII. Axthemideae. 



Receptacle naked, heads discoid: 



Plants spiny; achenes and corollas cobwebby. 

 Plants not spiny; achenes not cobwebby. 



13. PlCROTHAMNUS. 



;■». Artemisia. 



Tribe VIII. Sexecioideae. 



A single genus: Flowers yellow: heads rayless: 



shrubs tomentose. 1">. Tetradvmia. 



I. CARPHOCHAETE Gray. 



Perennial herbs or shrubby plants with glabrous or glabrate 

 foliage; leaves opposite; blades narrow, leathery, sessile; heads dis- 

 coid; solitary or terminating branches: involucre- narrowly eylindric, 

 4 to 6-flowered; bracts few. in few series, acuminate, -.vely 



longer: receptacle naked: corollas regular, slender: anthers often 

 with a cleft appendage at the ape.\: stigmas filiform, rather obtuse; 

 nes elongated. 10-striate; pap'pns "i several linear-subulate 

 erose-denticulate scat ales, with the mid-nerve prolonged into 



a barbellate awn. 



i. i a. 



2. COLEOSANTHUS Cass. 



Herbs or shrubby plants, with uprighl blanching .-terns: leaves 

 opposite or alternate; blades broadest below the middle, usually 

 toothed, prominently nerved beneath; head- several or numerous, or 

 rarely solitary discoid; involucres oblong to campanulate, lew to 

 many-flowered; bracts narrow, striate, in several -cries, the inner 

 successively longer, receptacle naked; corollas regular; anthers oh- 



