408 OBDEE 70. COMPOSITE. 



AKTIFICIAL ANALYSIS OF THE GENERA. 

 A. SUBORDER, TUBULIFLOILE. 



Heads discoid, that is, without rays. (1) 



1 Receptacle naked, i. e., with no pales or "bristles among the flowers. (2) 

 2 Pappus a circle of 5 20 chaffy scales, (a) 

 2 Pappus none, or a short, toothed margin, (b) 

 2 Pappus composed of many capillary bristles. (3) 

 3 Leaves opposite. (Heads homogamous.) (d) 

 3 Leaves alternate. (4) 



4 Heads homogamous, fls. all perfect, (c) 

 4 Heads heterogamous, fls. not all perfect. (5) 

 5 Scales herbaceous, often deciduous, (e) 

 5 Scales scarious, persistent, often colored, (f) 

 1 Receptacle chaffy bearing pales among the flowers. (6) 

 6 Leaves alternate, (g) 



6 Leaves opposite, (h) 



1 Receptacle bearing bristles, or deeply alveolate (honey-combed). (7) 



7 Pappus none, or consisting of scales, (i) 

 7 Pappus composed of many bristles, (j) 



Heads radiate, i. e., the outer flowers ligulate. (8) 



8 Receptacle naked (not chaffy), or (in No. 67) deeply honeycomb-celled. (9) 

 9 Pappus of 5-12 scales which are 1-awned or (in No. 61) cleft-bristly, (k) 

 9 Pappus none, or of a few short awns. (1) 

 9 Pappus of many capillary bristles. (10) 

 10 Kays cyanic, in a single row. (m) 

 10 Kays cyanic, in several rows, (n) 

 10 Rays yellow, in about one row. (11) 



11 Pappus double, or of very unequal bristles, (o) 

 11 Pappus simple, the bristles all similar. (12) 



12 Involucre scales imbricated, the outer shorter, (p) 

 12 Involucre scales equal, not imbricated, (r) 

 8 Receptacle chaffy, with pales among the flowers. (13) 



13 Disk and ray flowers both fertile, the latter pistillate. (14) 

 14 Kays yellow (s) 

 14 Kays cyanic, (t) 



13 Disk flowers sterile, ray flowers fertile. (ti) 

 13 Disk flowers fertile, ray flowers sterile. (15) 



15 Achenia obcompressed, often beaked, (v) 



15 Achenia compressed laterally, or not- at all. (x) - 



a Corolla lobes one-sided. Head largfc, many-flowered STOKESIA. 2 



a Corolla lobes one-sided. Heads 4 5-flowered, aggregated ELEPHANTOPCS. 3 



a Corolla lobes equal Leaves opposite. Pappus awned AGERATUM. 4 



Leaves whorled. Pappus obtuse SCLEROLEPIS. 5 



Leaves alternate. Pappus scales 8 10 POLYPTERIS. 68 



Pappus scales 12 20 HYMENOPAPPUS. 64 



b Leaves opposite. Flowers dioecious, obscure AMBROSIA. 45 



b Leaves alternate. Flowers yellow. Disk conical ! MATIUCARIA. 73 



Flowers yellow. Disk convex TANACETUM. 75 



Flowers whitish. Erect, leafless above ADENOCAUXON. 15 



Erect, leafy ARTEMISIA. 76 



Low and depressed SOLIVA. 77 



C Scales of the involucre in one row. Flowers cyanic CACALIA. 84 



C Scales of the involucre in one row. Flowers yellow ,. SENECIO. 86 



C Scales imbricated. Flowers yellow BIGELOVIA. 27 



Flowers whitish. EUPATORIRUM KUIINIA. 8 



Flowers purple. Pappus simple LIATRIS. 7 



Pappus double VERNONIA. 1 



d Achenia 10-striate. Flowers purple BRICKELLIA. 9 



d Achenia 5-angled. Receptacle conical. Flowers blue CONOCLINITTM. 12 



Receptacle flat. Scales 4 or 5 MIKANIA. 11 



Scales S 20. ... . . .EUPATORIUM. 10 



