120 ENGLISn BOTANY. 
the female. Pericline f to ^ inch long in the sub-male, J to J inch 
in the female plants. Phyllaries suh-scarious at the margins, gene- 
rally purplish, longitudinally veined. Corolla pale reddish-purple 
in the sub-male florets, with a bell-shaped limb, — in the female 
very slender ; and the latter have the branches of the style also 
more slender. Pappus white, longer than the yellowish-brown 
cylindrical achenes. Plant dull-green ; the scapes generally pur- 
plish, decaying early in the sub-male plant, which rarely produces 
seed. 
M. Jordan divides this into two, P. riparia and pratensis : of 
these I have not seen authentic specimens, but, judging from the 
descriptions, the British plant (so far as I have seen) is P. riparia. 
Common Butter-bur. 
French, Tussilage Petasite. German, Gebrauchlicke Neunkrafl. 
Tribe X.— EUPATOBIEjE. 
Leaves opposite, more rarely verticillate or alternate. An- 
thodes almost always homogamous and discoid. Elorets generally 
all tubular and perfect, or more rarely the exterior ones female 
and tubular, or very rarely female and ligulate. Anthers without 
basal appendages. Style with the branches usually much elongated, 
obtuse or clavate, with the stigmatic lines inconspicuous, termi- 
nating near the middle of the branches of the style, not confluent. 
Pappus generally present, consisting of rough or plumose hairs, 
more rarely of chaffy scales or crown-like. 
GENUS XXVIL—E UPATORIUM. Toumef. 
Anthodes homogamous and discoid, 3- or many - flowered. 
Pericline cylindrical or bell-shaped ; phyllaries few, imbricated. 
Clinanth flat, naked. Elorets all perfect, cylindrical - funnel- 
shaped. Styles with very long pubescent branches, which are 
stigmatifcrous only below. Achenes 5-angled-prismatic. Pappus 
of denticulate hairs, arranged in a single row. 
Perennial herbs, with the leaves generally opposite or verti- 
cillate, more rarely alternate, frequently sprinkled with resinous 
dots. Anthodes small, generally arranged in compound corymbs, 
more rarely in panicles; florets white, pink, purplish, or blue. 
This genua of plants is supposed to be named after Eupator, a surname of Mith- 
ridates, king of Pontus, by whom the plant was introduced as an alexipharmic. 
