Spring Flora of Oklahoma 
201 
Stem leaves narrowly linear, y 2 f - lojig. Basal leaves spatulate. 
Heads numerous, 6"-8" broad. Rays 6-10, oblong. Achenes pubes¬ 
cent. Pappus of 5 or 6 ovate awned scales. 
In dry soil. May-September. Common. 
2. Tetraneuris stenophylla Rydb. Narrow-leaved Tetraneuris. 
Perennial, with a branched caudex. Bases of the leaves dilated, 
sparingly silky-villous. Blades narrowly linear, long, glab¬ 
rous, punctate. Scape 2'-4' high, minutely strigose. Rays about 5" 
long. 
In dry soil. May-August. Harmon county. 
XXIII. HELENIUM L. 
Annual, biennial or perennial caulescent herbs. Leaves 
alternate, entire or toothed, often decurrent on the stem. 
Heads radiate or rarely discoid, peduncled. Involucre flat- 
tish, bracts in 1 or 2 series, linear or subulate, reflexed or 
spreading. Receptacle convex, sub-globose or oblong, naked. 
Ray-flowers pistillate and fertile, or neutral. Disk-flowers 
perfect, fertile 4-5-toothed, the teeth glandular-pubescent. 
Achenes turbinate, ribbed. Pappus of 5-8 entire, dentate 
or incised, acuminate or aristate scales. 
Disk yellow; leaves with entire blades. 
1. H. tenuifolium. 
Disk purple brown; some of the lower cauline leaves 
with pinnately-parted blades. 2. H. badium. 
1. Helenium tenuifolium Nutt. Fine-leaved Sneezeweed. An¬ 
nual. Glabrous or pubescent above. Stem very leafy and usually 
much branched, 8'-24' high. Leaves all linear, filiform, entire, sessile. 
Heads numerous, corymbose, 9"-15" broad. Rays 4-8, fertile, 3-4- 
toothed, at length drooping. Achenes villous. Pappus scales ovate 
tipped with slender awns. 
In dry or moist soil. May-October. South and eastern part of 
state. 
2. Helenium badium (A. Gray) Greene. Sneezeweed. Similar 
to H. tenuifolium in habit, but usually more slender, the lower 
cauline and basal leaves, or some of them, pinnately parted into 
slender segments. Disk purplish brown. 
In dry soil. May-August. Southwestern part of the state. 
XXIV. GAILLARDIA Foug. 
Annual, biennial or perennial, scapose or caulescent 
