THISTLE FAMILY 631 
Receptacle usually chaffy 
Branches of the style provided with a fascicle of soft bristles. 
Bracts of the involucre herbaceous or leaf-like 
Riis 2. oe, PRB oye LE LIAN DHEA 
Similar to bh cat bracts of the involucre ae. scaly and 
overlapping, in several ranks. Heads with white rays 
TRIBE 7, ANTHEMIDEAE 
Florets all tubular and perfect (i. e. with both stamens and 
pistils). Anthers prolonged above into long appendages at 
the tips and below into tails. . . . ‘TRIBE 9, CYNAREAE 
ARTIFICIAL TABLE OF GENERA ACCORDING TO TRIBES 
Tribe 1, Vernonieae 
Leaves alternate. Flowers all alike, purple; style with long hairy 
branches; aigrette double. 
Flower heads not surrounded by a sub-involucre . . Vernonia 
Flower heads surrounded by a sub-involucre . . Elephantopus 
TRIBE 2, Eupatorieae 
Leaves opposite or alternate. Branches of style obtuse, fruit 3- to 
5-angled. 
Leaves opposite. 
WTCCCAADIANES seca wise uct Dear Pece Pica Peay alice!) s Eupatorium 
Chimbinge= vines = 2) “ae of eee Hl Mees oe Me Mitkcania 
Leaves alternate. 
Hlowersiein, aituse clustersi, = ayes ee- te) an oe eeemeeikculinaa 
lowers anwnarrow. spikes! ea) 00 9s i405. hs. % @s =o eleiatris 
HheayeseimSwhoris)of 4.) 1.02. @ 4» « « S§clerolepis 
Tripe 3, Astereae 
Florets allof one kind ... . 7 + + - (Chondrophora 
Flowers all of one kind in individual feeds but pistillate heads on 
one plant and staminate on another, shrub Baccharis 
Ray flowers yellow (in Solidago bicolor, white). 
Heads large, many flowered; aigrette double Chrysopsis 
Heads small, few flowered; aigrette simple Solidago 
Rays not usually more numerous than the disk flowers. 
Rays more numerous than the disk flowers Erethamia 
Ray flowers white, blue, purple, never yellow, leaves on the stem. 
Pappus (aigrette) a single series of bristles (sometimes a few 
short ones outside the series). 
