class xviir. xlix 



CLASS XVIII. SrXOENTESlA.— 5 Anthers runted in a 



tube. 



PAOS. 



Obs. Tft^ plant? of this elans, with r, f .<w exceptions, have 5 anthers united into 

 a single tuhe. The flowers are in. heads inserted upon a common re- 

 ceptacle, which is surrounded hy an- involucre : h/fincc usually known aa 

 Compound Flower*. They form the Natural order Comports?. 155 



t TU8ULITL0R.E.— -Corolla of the perfect or disk flowers, tuhu'ar. regular, the 



li;nb n-cloft or lobed; the li_'iilate or ray-flower* when p'-es"nt eith'T 

 pi-itiM \t" on'y or neutral (_with neither stamens or pistils), and occupy- 

 ing the border. K8 



* IToads discoid (without roy-Jipwers) ; the flowers all alike, 

 perfect tabular; branches of the style slender thread- form. 

 or bristle-form. 



* Flowers violet <-.r purple. 



Y/ras )via. page I'd. El-piu-s-topcs, page 156. 



*'* riearls discoid or radia'c; branches of the style rnucK 

 elongated, obtuse or club-shaped. — Leaves mostly opposite. 



* IT- ids without ray-flowers. Flowers all alike, tabular, blue, purple or wh!t!-h 

 n >t y .'Mow. 



LfATRls. p:\re l.*>7. K'"w, p. 159. IffKum, p. 158. CoxJCLiyiCM, p. 158. 

 EDPATORn7M. p. 15). 



**rr.i,Zs raliate (with rav -flowers'!; flowers dissimilar, or dicecious purplish 

 yellow. 

 {ftFumx.v. p. 1 "d. Tusstcago. p. 101. . 



** * Heads radiate, rarely discoid ; branches of the style 

 more or less flattened an 1 linear. — Leant* mottfy alternate.. 



* riaU radiate; ray* white, reddidit b'ue or p*ir ; )le, very rarely yellow. 

 jLgTBS. — Heads many-flowered. Bisk yellow, often changing to purple. 18 1' 

 Gvlvtki.t.v. p. l-v>. Emoirox. p. l$7. n^Lipvp^us. p. 108. BOLTntOA, p. 169. 



SERIC 'CVRPJS. p. 139. C\LUST3PHU3. p. 170. D IHLU, p. 170. 



* * Beads radiate ; rays yellow, rarely whitish. 



SbUDAdl — II\ads few. or many-flowered, small.— Fhicers expanding in the 



autumnal ninths. 171 



C.iRT.sipsi'. — IT ad- many-flowered. — Flowers forge, golden yellow, terminating 



0i* branches. 124 



Ixsla— Heads mady-flowered. large.— Leaves large. 175 



EcupfA. — Heads many-flowered, small, with minute flowers. . 175 



* ** UcAids discoid ; Rowers purplish. 



Putubv — Heads many-'.lowered, in corymb". 175 



* * * * Heads radiate or discoid; branches of the styl<v 

 linear, hairy or hieped at the apex, which is either truncated 

 or produced in a conical or elongated appendage. 



* H-ads radiate ; ficwrrs yellowish or greenish ; sometimes monoecious. * 

 Pii.tmxix. — Leaves opposite .dar?e. 176- 

 S'T.paiCM. — Heads large, with yellow flowers. 177 



Ambrosia. — Heads monoecious, the fertile nt the base, and the sterile at the top 

 of the spikes.— Coane weeds, with lobed or dissected lenves, and incon- _ 

 spicuousJi'W'rs. IT 7 ," 



Mm* 



