CARDUACEAL 
the lor 
achene 
inner pe or elliptie-obovate, 4-5 mm. lon 
2— long, densely appres ssed- Sub Sect 
2.0 mm. 
ida than the aehene.—Waste-places, Coastal Plain, Ala. 
Sun 
95. HELENIUM L. An 
herbs. 
Heads solitary, few, or numerous. Involucre flattish: 
ceptaele conic, ellipsoid, or subglobose. 
eve with cuneate yellow or red-stained ligules. 
ovate lobes. Achene ribbed. pus 
—About 25 species, North American.—SNEEZEWEEDS. 
Ray-flowers Be or wanti de 
Plant annual or rarely biennial. 
av a with EUN wly eee or linear-filiform blades, 
not decurrent. 
ves with broader blades, more or less decurrent. 
ads corymbose. 
or 3 on long peduncles, 
TENUIFOLIA 
I. 
Leaves numerous; blades entire: pappus-scales awn-tipped.. 
II. UADRIDENTA 
Leaves few; blades of the lower ones Sud lobed: 
pappus- -scales rounded. 
III. AUTUM 
Disk mostly over 1 em. wide: disk-corollas ps 3 mm. 
ong. 
Disk — less than 1 em. wide: disk-eorollas about 2.5 
vide. 
IV. NUDIFLORA 
Disk yellov 
Disk Dun or dark- vidue 
Upper part of the stem branches with wings 
wide or less: upper ie: leaves much smaller than 
the lower one 
Upper part of ihe stem and branches with wings 2 mm. 
wide or more: upper cauline leaves not conspicuously 
smaller than the lower ones. 
V. HELENIA 
Disk yellow. 
Receptacle oid or ovoid-conic: disk subglobose to 
hemis nens bracts of the involucre early reflexed. 
Pappus- scales dissected into bristle-like segments: 
.5 em. wide. 
uua -scales entire or merely erose: 
wide. 
je ide and disk depressed- e or convex 
bracts of the involuere spreading or tardily re- 
disk about 2 
curv 
ree glabro us or merely glandular-granular. 
t it on the ribs. 
Disk San or bro 
. tenuifolium Nutt. Plant 2-4 dm. leaves 
involueral bracts linear-subulate P" Dac 
1. 
cm. long : 
1459 
campanulate; bracts finely pubescent, the m ovate, tubercled at the pdt 
ng, 
onger than the ou 
pappus-seales Ed 
. of S. ke 
Nat 
5. nual, biennial, or perennial, bitter, caulescent 
Leaves alternate: blades entire, toothed, or pinnatifid, often decurrent. 
bracts spreading or re- 
Ray-flow 
Disk-corollas with broa 
of 5-8 acuminate or awn-tipped dn 
rers several, i 
I. TENUIF 
II. QUADRIDEN TAT A. 
lII. At 
IV. NUDIFLORA. 
n HHELENIA. 
1. MH. tenuifolium. 
. H. quadridentatum. 
H. latifolium. 
. H. parviflorum. 
. H. parviflorum. 
C 
. H. nudiflorum. 
c 
. H. polyphyllum. 
(. H. fimbriatum. 
. H. Curtisii. 
9. H. x us 
10. H. ven 
11. H. Dco CUN 
blades 1-5 
mm. long: ligules 
numerous; 
4-7 
