XLVI. COMPOSITE. 
207 
45*. Anacyclus. Heads heterogamous, with a ray. Florets of the raj' 
oblong-linear. Achenes compressed, winged at the edges. 
46. Achillea. Heads heterogamous, with a distinct raj r . Florets of 
the ray short obovate. Achenes compressed. 
25. Diotis. Heads homogamous, discoid. Florets and achenes com- 
pressed. 
ff Receptacle without scales. 
42. Bkllis. Heads heterochromous. Florets of the ray ligulate, con- 
spicuous. Scales of the invol. nearly equal in length. Achenes 
compressed; epigynous disk minute. 
27. Artemisia. Heads discoid, homochromous ; ligulate florets, when 
present, short or filiform. Invol. imbricated. Achenes with a 
minute epigynous disk. 
26. Tanacktum. Heads discoid homochromous and homogamous, or the 
florets of the circumference with a short ligule. Achenes with a 
large epigynous disk. 
44. Matricakia. Heads heterochromous, florets of the ray conspi- 
cuously ligulate, of.the disk terete. Achenes of the disk and ray 
similar, angled. Epigynous disk large. 
43. Chrysanthemum. Florets of the ray conspicuously ligulate, of the 
disk compressed at the base. Achenes of the disk somewhat terete. 
Epigynous disk large. 
*** Pappus pilose. Heads discoid. Florets all perfect. 
28. Eupatorium. Style much exserted, with long blunt branches. 
(Flowers never yellow.) 
29. Linosyris. Stj’le slightly longer than the cor. Invol. loosely im- 
bricated, or of one row of equal scales, surrounded by several long 
ones. Achenes compressed. (Flowers j'ellow.) 
37. Senecio. Style slightly longer than the cor. Invol. cj’lindrical or 
conical, of one row of equal scales with several small ones at the 
base. Achenes terete. 
**•* Pappus pilose. Heads discoid. Florets of the circumference, or all, 
imperfect. 
30. Antennaria. Dioecious. Heads dioecious. Invol. imbricated, dry 
and scarious. 
31. Gnaphalium. Heads heterogamous, all similar. Invol. imbricated, 
dry and scarious. Recept. flat and quite naked. 
32. Filago. Heads heterogamous. Invol. imbricated, dry and scari- 
ous. Recept. conical, with 1 — 5 rows of scales among the outer 
florets. 
40. Inula. Heads heterogamous. Invol. imbricated, herbaceous. Florets 
of the ray in a single row, with a narrow ligule. Anthers with 
bristles at the base. 
35. Erigeron. Heads heterogamous. Invol. imbricated in several rows. 
Florets of the ray in several rows, with a narrow ligule. Anthers 
without bristles at the base. 
33. Petasites. Subdicecious. Heads monoecious. Invol. in a single row, 
herbaceous, with one external row of scales. Fertile florets fili- 
form, truncated. 
33*. Homogyne. Heads heterogamous, with a single row of filiform 
pistillate florets in the circumference. Involucre in a single row, 
with an external row of scales. Style with long papillose branches. 
Anthers without bristles at the base. 
