1450 CARDUACEAE 
longifolia Small. Plant 7-10 -dm. tall: gis of ies lower bd 
linear- -elliptie, eae E or linear, entir outer involueral braet 
lanceolate, 2-4 mm. long: achene obovate or PNE in outline, ~ 4 mm. 
lon —Low erm and thickets, Coastal Plain, Fla. and Ga.—Fall 
23. C. falcata F. E. Boynton. Plant 8-12 dm. tall: blades of the 
leaves Pus ie. entire or with 1 or 2 narrow lobes: Mei involucral ae 
lanceolate, long: achene elliptic, about 5 mm. long—Swamps and 
pineland dude id Plain, N. C.—Early sum 
24. C. gladiata Walt. Plant 6-12 dm. tall: blades of the lower leaves 
edes or oblanceolate, entire: outer involueral braets broadly. piu bu 3 
long: achene elliptic, about 3.5 mm. long .—Swamps and low pinelands, 
Coastal Plain, Fla. to Miss. and N. C.—Fal 
25. oe in e Poir. Plant 6-9 dm. tall: n of the lower e 
ovate, e: outer involueral bracts elliptic, 4-6 mm. long: achene not see 
Mo ist Eu "Coastal Plain, Fla. and Ga.—Fall. 
26. C. helianthoides Beadle. Plant 5-12 dm. tall: blades of the vidi leaves 
ovate to ovate-lanceolate, entire: dear involueral bracts lanceolate, 5-9 mm 
long: achene spatulate, about 3 mm. long.—Low grounds, bogs, a ori 
Coastal Plain, N Fla. and Ga.—F 
C. nudata Nutt. b ds 6-12 dm. tall: leaves terete: outer Sanaa 
bracts ia 4-6 mm. long: rays pink-purple: achene elliptic, about 3 m 
ong.—Wet pinelands and cypress ponds, Coastal Plain, Fla. and Ga Soke 
7. BIDENS L. Annual or biennial, or rarely perennial, herbs. 
Leaves opposite or the upper ones sometimes alternate: blades entire, toothed, 
or divided. Heads erect or nodding.  Involuere d the outer braets 
foliaeeous, the inner appressed. Ray-flowers few an white or yellow 
ligules, or wanting. JDisk-eorollas with a short tube an a a longer throat: 
lobes mostly deltoid. Achene flat, terete, or 4-angled. Pappus of 2-4 rigid 
barbed awns or these much reduced and tooth-like—About 75 species, of wide 
geographic distribution.—BUR-MARIGOLDS. BEGGAR-TICKS. 
Achene spindle Shaped, gradually tapering above: ligules of the ray white or yel- 
lowish whit I, LEUCANTHAE 
meee flattened, broadest above the middle: ligules of the 
when present, yellow 
Ray- -flowers inconspicuous and caducous or wanting. II. VULGATAE. 
Ray-flowers showy or conspicuous. 
Leaf-blades undivided: pappus-awns 2—4, retrorsely 
barbed. III. CERNUAE. 
Em piinata iden or individually simple: 
appus-awns 2 0 IV. AUREAE. 
I. LEUCANTHAE 
Leaves 1-3-pinnately dissected, the divisions incised or lobed: 
ray-flowers with inconspicuous, mostly entire ligules 1. B. bipinnata. 
Leaves 1-pinnate or undivided, the segments evenly ‘erenate- 
serrate: ray-flowers with showy and lobed ligules. 2. B. pilosa, 
II.  VULGATAE 
Leaves usually undivided: pappus awns 3 or 4. 
Disk-corollas pale, 4-lobed: achene- nares strongly, re- 
trorsely barbed throughout; involucre long. 3. B. comosa. 
1 Contributed by Karl McKay Wiegand. 
