EUPATORIUM.—PETASITES. 165 
weeEEE Fruit terete, ribbed. Otherwise like the preceding section. 
46. Crepis. Heads many-flowered. Involucre double, inner 
of 1 row, outer of short lax phyllaries. Fr. terete, narrowed 
upwards or beaked. 
47. Hisracium. Heads many-flowered. Phyll. imbricated, 
many, oblong. Fr. truncate above not beaked, with a very 
short crenulated margin. 
ANoMALovus Genus. Order AmMBRos1AcE# Link. 
(48. XanrHium. Heads moncecious. Male. Involucre of 
1 row of free phyllaries, many-flowered. Receptacle scaly. 
Cor. funnelshaped, 5-cleft. Anth. free. Stigma obtuse, 
entire.—Fem. fi. 2, inclosed within the involucre which is 
terminated by 1-—2 beaks and covered with hooked spines 
and at length hardened over the fruit. Cor. fiern. 
Stam. 0. Stigmas 2, diverging, linear. Fr. compressed 
each occupying a cell in the involucre. | 
Suborder I. TUBULIFLORA. Perfect florets tubular, regular, 
teeth 4 or 5. 
Tribe I. Hupatoriee. 
Style of the perfect florets cylindrical with elongated slightly 
clavate branches which are downy above; stigmatic lines but 
little prominent, often not extending as far as the middle of the 
branches. 
Section 1. ADENOSTYLE. Heads homogamous (florets 
all perfect).—Pappus pilose and rough. 
1. Evpeatorium Linn. 
1. E. cannabinum (L.); 1. in 3 or 5 deep lanceolate serrated 
segments the middle one longest.—E. B. 428.—St. herbaceous, 
erect, striated, scabrous, 2—3 feet high. Heads in a fastigiate 
corymb, 5—6-flowered ; phyll. about 10: 5 exterior short obtuse. 
Florets reddish-purple. L. downy, Herb slightly aromatic.— 
Banks of streams. P. VIII. IX. Hemp-Agrimony. 
Section 2. TUSSILAGINE. Heads heterogamous or sub- 
dicecious. 
2. Perasites Gaert. 
1. P. vulgaris (Desf.); 1. roundish-cordate unequally toothed 
downy beneath ; basal lobes approximate, stigmas of the submale 
