Bulletin University of New Mexico—No. 49 
Involucral bracts not inclosing or embracing the 
achenes. — 
Achenes ee 5-12 in one row, no pappus, 
- - - (17) BERLANDIERA. 
Res i) very short, persistent ; pappus of 2 small 
| scales, involucral bracts short, in 2 rows, 
- : : - (18) PARTHENIUM. 
**Pertile flowers 1 tod, the corolla none or a mere 
tube; staminate corolla funnel-form; no pappus; heads 
of 2 sorts on the same plant, the stamanate, with an op- 
en cup-shaped mvolucre, the pistillate um an closed bur- 
like wmvolucre. 
Bracts of staminite involucre united, receptacle low. 
Involucre armed with 4-8 tubercles or short spines 
in one row, - - (19) ' amBRosr4. 
Involucre bur- slike, armed all over with 
the spines - - - (20) ¥FRANSERIA. 
Bracis of staminite involucre distinct,: receptacle cyl- 
indraceous, = - -  -. (21) xaNTHIUM. 
ao bay flowers ligulate pe fertile, the ligule persis- 
tene on the achenes and becoming papery ; leaves oppo- 
site and heads singly ternanating stems or branches, 
(22) zINNIA. 
Poy Heads radiate or rarely discoid, the disk flowers 
all perfect and fertile; anthers blackish; pappus none 
or 1 or 2 chaffy awns. | 
Receptacle from conical to columnar. 
Rays few, neutral, achenes’ flattened and mar- 
gined, - - - (23) LEPACHYS 
Receptacle from flat to convex; ; achenes not very 
flat, nor winged, nor margined. 
Pappus none or a minute denticulate 
ring . - - (24)° GYMNOLOMIs. 
Pappus deciduous, of two thin scales 
. : - - (25). HELIANTHUS!} 
Receptacle flat or convex; achenes of disk either 
flat or margined or edged or winged. 
Achenes 1 to 3-awned; leaves apt to be decurrent, 
- - - (26) VERBESINA. 
##22*Rave usually wanting, a at least neutral. 
Receptacle flat, leaves opposite; inner involucral 
bracts a cup, - - (27) THELESPERMA. 
TRIBE..V. HELANIOIEAE. Nearly as in last tribe, 
but receptacle not chaffy (except 33) and herbage 
often covered with dots (glands. ) 
(3) 
