Pectis. COMPOSITiE. 63 



I. P. linifolia (Linn.) : stem diffusely branched ; leaves linear, mncronate, 

 dotted with large glands, ciliate with bristles towards the base ; heads on 

 slender minutely bracteolate pedicels, 4-18-flowered ; scales of the involucre 

 4-6, elliptical-lanceolate, equal, conduplirafe, with broad scarious margins, 

 not glandular; pappus of rather broad chaff", mostly awned, the bristles in 

 the ray-flowers 2, equal, in the disk usually 5. — Linn, amaji. acad. 5. p, 

 107, Sf spec. ed. 2. p. 1250; Lam, ill. t. 684; Less. I. c. ; DC. prodr. 

 5. p. 99. 



Key West,Mr. Bennett ! Mr. Blodgett ! — A native of Jamaica, St. 

 Thomas, &c. 



Tribe II. EUPATORIACE^. Less. 



Heads discoid, with the flowers all tubular and perfect (homogamous), 

 or sometimes heterogamous ; the ray-flowers either tubular or ligulate. 

 Style cylindrical above ; the branches usually much elongated, obtuse 

 or clavate, puberulent or papillose externally towards the summit ; the 

 stigmatic lines inconspicuous, terminating near the middle of the 

 branches of the style, not confluent at their termination. Anthers 

 never caudate. — Flowers mostly of the cyanic series (white, blue, or 

 purple). Leaves commonly opposite. 



CONSPECTUS OF THE GENERA. 



Subtribe 1. Eupatorieje. — Heads discoid, homogamous. 

 Div. 1. Agerate^. — Pappus chaffy, aristate-squamellate, or coroniform. 



7. CcELESTiNA. Pappus coroniform or cup-like. 



8. Ageratum. Pappvis of 5-10 distinct often aristate chaffy scales. 



9. ScLEROLEPis. Pappus of 5 obtuse corneous scales. Leaves verticillate. 



Div. 2. Adenostyle^. — Pappus of slender or capillary bristles. 

 * Achcnia striate or ribbed. 



10. Carphephorus. Receptacle chaffy. Pappus barbellate. 



II. LiATUis. Receptacle naked. Scales of the involucre not striate. Lobes of 



the corolla elongated. 



12. Clavigera. Receptacle naked. Scales of the involucre deeply striate. Teeth 



of the corolla very short. Pappus plumose-barbellate. 



13. Kuhnia. Receptacle naked. Teeth of the corolla short. Pappus plumose. 



14. BuLBOsTYLis. Receptacle naked. Pappus scabrous. Heads 10-25-flowered, 



15. Brickellia. Receptacle naked. Pappus scabrous. Heads 30-50-flowered. 



* * Achenia 5-anglcd, 7wt striate. Pappus scabwus. 



16. EupATORiUM. Receptacle naked, flat. Scales of the involucre munerous. 



17. Mikania. Receptacle naked, flat. Scales of the involucre (and flowers) 4-5. 



18. CoNocLiNiuM. Receptacle conical, naked. 



Subtribe 2. Tussilagine^. — Heads with the flowers heterogamous, or dioecious. 



19. Nardosmia. Heads corymbose, many-flowered, somewhat dicecious. 



20. Tussilago. Head solitary, many-flowered, heterogamous ; the pistillate flow- 



ers ligulate, in several series. 



21. Adenocaulon. Heads few-flowered, heterogamous ; the floAvers all tubular. 



