448 SYNGENESIA [Vkrxoniack* 



IV. Verxoxia Tribe, Heads homogenous with perfect florets, 

 or rarely heterogamous -with florets in a single series, the pistillate 

 ones bearing ligulate corollas in the circumference, the rest perfect. 

 Corolla of the perfect florets mostly regular, 5-cleft, with diverging 

 lobes. Style with the branches mostly long and subulate. Verxon. 

 i ac e.i*. Letting. 



Sub-Tiibe 1. Vernonibje. Heads many-flowered and homogamous, or Lflow 

 ered ; involucre imbricated, In many aeries. Branches of the StyU acuminate. 



368. VERNONIA. Screb. JVutt. Gen. 640. 

 [Dedicated to William Vernon; an Engish Botanist] 



Heads many-flowered. Involucre ovoid, imbricated. Florets all tub- 

 ular, perfect. Pappus in several scries ; the outer scries short, bristly. 

 paleaceous, the inner hair-like. Receptacle naked. 



1. V. pr^alta, Willd. Leaves numerous, lanceolate, serrulate, 

 scabrous ; corymb fastigiate ; leaflets of the involucre ovate, acute, or 

 filiform at apex. Beck, Bot. p. 175. 

 Also, V. noveboracensis, of the Authors here quoted. 



Very tall Verxoxia. Vulgo — Iron weed. 



Root perennial. Stem 2 or 3 to 6 or 7 feet high, striate-su)cate, rough ish-pubes. 

 cent, somewhat branching at summit. Leaves 3 to 6 or 8 inches long, and 3 fourths, 

 of an inch to 2 or 3 inches ( usually about an inch or inch and half) wide, lanceo- 

 late, or lance-oblong, sessile or subsessile, serrate, mostly somewhat scabrous and 

 coriaceous. Heads of flowers in a large terminal corymb; leaflets of the involucre 

 imbricated, ovate, with a subulate or filiform acumination, mostly dark purple. 

 Florets of a bright deep purple. Akencs oblong-turbinate, sulcate, scabrous with 

 short hairs ; pappus a dirty white, or often purplish, scabrous, in a double series, 

 l he outer one consisting of short chaff-like bristles. 

 Hab. Meadows, and low grounds: frequent. Ft. August. Fr. September. 



Obs. I have long thought that this, and V, noveboracensis, were scarcely distinct 

 species ; and am pleased to find that opinion sanctioned by the high authority of 

 Prof. Hooker, and others. This is a well known and rather obnoxious weed, in 

 our meadows. Five or six additional species are enumerated in the U. States. 



V. Eupatorium Tribe. Heads homogamous with perfect florets, 

 rarely heterogamous, very rarely sub-dioicous. Corolla regular, 

 mostly 5-toothed, with the teeth erect. Style with the branches mostly 

 very long and clavate. Eupatoriacejb. Lessi?ig. 



Sub-tribe 3. Eupatoribjr. Heads homogamous with the florets ail perfect. 

 Pappus consisting of hairs or very narrow bristles, often plumose. 



369. LIATRIS. Schreb. AW**. Gen. 639. 

 [A. name of uncertain derivation.] 



Heads many-flowered. Involucre of many series, oblong, imbricated. 

 Corolla with the limb not distinct from the tube. Pappus in several 

 scries, plumose. Ahenes obconic, ribbed, hairy. Receptacle naked. 



1. L. spicata, Willd. Leaves lance-linear, smoothish, punctate, cit- 



