182 COMPOSITK FAMILY. 



b. Branches of the style long and slender or mostly rather dub-shaped, smooth or 

 very minutely puberulent under a lens. 



21. LIATRIS. Heads of several or many rose-purple flowers, surrounded by a 



more or less imbricated involucre. Lobes of the corolla rather long. AkeVies 

 slender, about 10-ribbed: pappus of many tong and slender bristles, which are 

 plumose or else beset with a short beard' or roughness for their whole length. 

 Leaves alternate, entire. 



22. KUHNIA. Heads small, of 10-25 dull cream-colored flower?, surrounded by a 



few lanceolate scales of the involucre. Corolla slender, barely 5-toothed. 

 Akenes cylindrical, many-striate: pappus a row of white plumose bristles. 

 Leaves mostly alternate/ 



23. MIKANIA. Heads of 4 flesh-colored flowers, with an involucre of only 4 



scales. Corolla 5-toothed. Akenes 5-angled: pappus a row of hair-like 

 naked (barely roughish) bristles. Leaves opposite? stem twining. 



24. EUPATORIUM. Heads of 3 or more flowers, and an involucre of several or 



many scales. Corolla 5-toothed. Receptacle flat or merely convex. Akenes 

 5-angled: pappus a row of hair-like naked (barely rough) bristles. 



25. CONOCLINIUM. Heads, &c. as in the preceding, but the receptacle conical. 



Flowers many, blue or blue-purple. Leaves opposite. 



26. AGERATUM. " Like the preceding; but the receptacle flattish, and the pappus 



of a few chaffy scales, mostly tapering into a slender stiff rough bristle. 

 Leaves opposite. 



27. PIQUERIA. Heads very small, of 3-5 white flowers, and involucre of 4 or 5 



scales. Akenes 5-angied : pappus none. Leaves opposite, 3-ribbed. 



C. Branches of the style smooth, with a conical or flat unusally minutely hairy tip. 



28. CACALIA. Heads corymbed, with 5-30 white or whitish flowers. Scales of 



the involucre a single row, with a few small bractlets at base. Corolla 

 5-cleft. Akenes oblong, smooth: pappus of very manj fine and soft down- 

 like naked bristles. Leaves alternate. 



40. BELLIS. A cultivated state of the Daisy, with quilled (monstrous) flowers 

 may be sought here. 



B. With strap-shaped corollas or rays at the margin of &e head. 

 1. Herbage not spotted with In-ge translucent or colored strorrg-scented glands. 

 * Pappus of copious hair-like bristles: no chaff on the receptacle artong the flowers. 

 H- Rays yellow, except in one or two species of Senecio and one Solitlago, pistillate. 



29. TUSSILAGO. Ray-flowers very numerous and in many rows, fertile, with 



narrow ligules; the tubular disk-flowers few in the centre, and not fertile. 

 Scale of the involucre nearly in one row. Pappus fine and noft. Head soli- 

 tary on a scaly-brae ted scape. 



30. SENECIO. Ray-flowers several in a single row, or sometime? none: the disk- 



flowers (as in all the following) perfect and fertile. Scales of the involucre in 

 a single row, or often with small bractlets at the base. Pappus very fine and 

 soft. Heads mostly in corymbs. Leaves alternate, simple or compound. 



31. ARNICA. Ray-flowers several or many in a single row. Scales of the invo- 



lucre nearly equal in 2 rows. Pappus a single row of rough rather rigid 

 bristles. Akenes slender. Heads l'c\v and rather large. Leaver opposite. 



32. IXULA. Ray-flowers very numerous in one row. with narrow licules. Outer 



scales of the involucre leaf-like. Pappus of many slender roughish bristles. 

 Akenes narrow. Heads large and broad, the tubular perfect t'owcrs very 

 numerous their anthers with two tails at the base. Leaves alten ate. 



33. CHRYSOPSIS. Ray-flowers numerous in one row, scales of the involucre 



narrow, not leaf-like. Pappus of many roughish slender bristles, with also an 

 outer row of very short and stout or chaff-like brlrtles. Akenes flattened, 

 hairv. Heads single or corvnbed. Leaves alternate. 

 31. SOLIDAGO. Kay-flowers 1 - S, or rarely 10-16, the tubular disk-flowers sev- 



eral, rarely many. Involucre oblong, i's scales imbricated and anjircsoed, of 

 unequal leng h-. Pappu* a row of slender roughish l>ri-t!es. Akems nar- 

 row, terete, inaiiv-ril>i>e<l. Heads in panielcd racemes, corymbs, or clusters, 



mostly small. Leaves alternate. 

 H- - Rays white, purple, blue, cfr. never yellow, the flowers <>f the disk mostly 



A'STI-.KS and the like. Leaves alternate, simple. Akenes flattened or Jlattish. 



85. CALLIS TLTIIl'S. KM \-flowers very numerous, usually in more than one row, 



or in cultivated varieties in several' rows. Involucre i'n several rows, more or 



