390 COMPOSITiE. Helenium. 



2. p. 866 ; Michx. ji. 2. p. 133 ; Lam. ill. t. 688 ; Pursh,Jl. 2. p. 560 ; Ell. sk. 2. p. 316; 

 Bart. fl. A7ner. Sept. t. 26 ; Torr. compend. p. 308 ; Beck, hot. p. 201 ; Darlingt. fl. Cest. 

 p. 487 ; Hook. hot. mag. t. 2994, and fl. Bor.-Am. 1. p. 317 ; DC. prodr. 5. p. 666 ; Torr. 

 4- Gr. fl. N. Am. 2. p. 384. 



Perennial. Stem 2-3 feet high, with numerous slightly winged and minutely pubescent 

 angles, corymbosely branched above. Leaves 2-4 inches long, of a dull grayish-green color, 

 punctate, attenuate at each end. Heads numerous, an inch or more in diameter. Exterior 

 involucre of 8 - 12 lanceolate-acute scales. Rays mostly drooping. Disk half an inch or 

 more in diameter, greenish yellow ; the teeth of the corolla glandularly bearded. 



Low grounds and borders of streams ; common. August - September. The whole plant 

 is bitter, and the flowers have the properties of chamomile. In a powdered state, it is some- 

 times used to excite a discharge from the nose. 



Subtribe IV. Anthemide^, Cass., DC. Heads mostly heterogamous ; the ray-flowers 

 pistillate or rarely neutral, either ligulate or tubular : disk-flowers perfect, or sometimes 

 staminate and infertile. Anthers not caudate. Branches of the style truncate and mostly 

 bearded, very rarely with a conical jjoint. Receptacle naked or chafl'y. Pappus none, 

 or sometimes small and coroniform, rarely consisting of chaffy scales. 



CONSPECTUS OF THE GENERA. 



Div. 1. EUANTHEMIDEjE. Receptacle chaQ'y. Rays ligulate, or rarely wanting : disk-flowers perfect. 



29. Maruta. Rays neutral. Acheiiia obovoid, ribbed. 



30. Anthemis. Rays pistillate. Achenia terete or quadrangular. 



31. Achillea. Rays pistillate. Achenia obcompressed, margined. 



Div. a. CHRYSANTHEMEtE. Receptacle naked. Rays ligulate or rarely wanting : disk-flowers perfect. 



32. LEUCANTHEMnM'. Involucre depressed, imbricated. Receptacle flat or convex. Achenia somewhat terete, striate, 



without a pappus, or those of the ray with a coroniform or unilateral pappus. 



Div. 3. COTULjE and ARTEMISIEjE. Receptacle naked. Heads discoid, homogamous or hetero- 

 gamous ; the flowers all tubular ; those of the disk perfect, but sometimes infertile. 



33. Tanacethm. Heads homogamous or heterogamous. Achenia angled or ribbed, with a large cpigynous disk. Pappus 



none or minute. 



34. Artemisia. Heads heterogamous or homogamous. Achenia obovoid, ciowncd with a small disk. Pappus none. 



Div. 1. EuANTHEMiDE.*;, DC. Receptacle chaffy. Heads mostly radiate ; the rays ligulate, in a 



single series : the disk-flowers perfect. 



29. MARUTA. Cass.; DC. prodr. 6. p. 13. FETID CHAMOMILE. 



[Origin of the name uncertain.] 



Heads many-flowered ; the rays neutral (rarely almost wanting), continuous with the sterile 

 ovary. Scales of the hemispherical involucre imbricated in few series, shorter than the 

 disk. Receptacle conical, chaffy throughout or only at the summit. Achenia obovoid or 



