xl 
TABLE OF GENERA. 
35. Petasites. Flower-heads in a dense oral spike ; outer florets not ray-like. 
3G. Senecio. Involucrum scales linear, with smaller ones at the base, brown at 
the points. Outer florets ray-like (sometimes very slightly). Pappus simple, 
hair-like. 
37. Aster. Involucrum imbricated, scales linear. Outer florets ray-like, nume¬ 
rous, blue or purplish. 
38. Somdago. Involucrum closely imbricated. Florets of margin few, ray-like, 
yellow. 
39. Inula. Involucrum imbricated; scales leaf-like, spreading. Flower-heads 
large, terminal; outer florets ray-like. Pappus simple. 
40. Pulicaria. Involucrum hemispherical, closely imbricated, with narrow scales. 
Pappus double. Outer florets more or less ray-like. 
41. Limbarda. Involucrum imbricated, with linear scales. Pappus simple. An¬ 
thers with bristles at the base. Leaves succulent. 
42. Cineraria. Involucrum simple; scales many, equal, upright. Pappus simple, 
hair-like. Outer florets ray-like. 
43. Doronicum. Involucrum double, the scales longer than the disk. Pappus of 
the outer florets wanting. Outer florets ray-like. Heads very large. 
44. Bellis. Involucrum hemispherical, simple. Receptacle conical. Pappus 
wanting. Outer florets ray-like, white or pinkish. Leaves entire. 
45. Chrysanthemum. Involucrum hemispherical, imbricated; scales membranous 
on the margin. Pappus wanting. Outer florets white or yellow, ray-like. 
Leaves pinnatifid or jagged. 
46. Pyrethrum. Fruit crowned with a membranous border. Otherwise a3 
Chrysanthemum. 
47. Matricaria. Involucrum hemispherical, imbricated; scales obtuse, with a 
membranous border. Pappus wanting. Outer florets ray-like, white. Re¬ 
ceptacle naked, nearly cylindrical. 
48. Anthemis. Involucrum hemispherical, imbricated; scales membranous at the 
border. Outer florets ray-like. Receptacle chaffy. 
49. Achillea. Involucrum ovate, imbricated. Receptacle narrow, plain, chaffy. 
Pappus wanting. Outer florets few, ray-like. Heads in corymbs. 
*** Outer florets with neither stamens nor pistils; the rest with both. Florets all 
tubular. 
50. Centaurea. Outer florets funnel-shaped, much longer than the rest. 
**** Heads monoecious. 
51. Xanthium. Fertile involucrum prickly, 2-flowered. 
Order XLYI. CAMPANULACEiE. 
1. Campanula. Corolla bell-shaped. 
2. Phyteuma. Corolla rotate. Anthers distinct. 
3. Jasionb. Corolla rotate. Anthers adhering at the base. 
Order XLVII. LOBELIACEiE. 
1. Lobelia. The only British genus. 
Order XLVIII. YACCINIACEvE. 
1. Vaccinium. Segments of corolla short, nearly erect. 
2. Oxycoccu8. Segments of corolla long, reflexed. 
Order XLIX. ERICACEAE. 
1. Erica. Fruit dry. Calyx simple. Corolla persistent. 
2. Calluna. Fruit dry. Calyx double. Corolla persistent. 
