1466 CARDUACEAE 
1 mm. wide, acute, entire, 3-6 pairs of bids near the age heads sessile or 
nearly so, few in clusters: involucre prismatic, 4-5 mm. high; bracts 4-6, 
linear or linear-lanceolate: ray-flowers 2 3; ligules 2 2.5 mm. long: isk- 
aod: 6 or 7, with ila abe ut 2.5 mm. long: achene 3 mm. long or nearly 
: pappus- -scales of the ray 2, narrowly "lan cial. and aristate-attenuate, of 
the disk 5. [P. ciliaris ‘Fernald, not L.]—Sandy woods and cult. grounds, pen. 
Fla.— (HF. I.). 
3. P. p rid a ass.) Urban. Stem more or less cad branched, 
1-4 
slender, dm , the branches prostrate, forming mats, finely pubescent 
in lines: leaf ee arrowly linear, comm only 1-3 em. long, e less than 
l mm. wide, acute ae e, with 2-4 poi irs of iiis below the m ere eps 
solitary on filiform Pod ue 1-2.5 long: involucre narrow, 
high; bracts a linear or nearly so: ray flowers 0; ligules 2-2. p mm. Tis disk- 
s 4—7, with corollas 2-2.5 mm. long: achene slender, 2.5-3 mm. ES 
dd i of the ray 2, with an B nce lanceolate base and a slend ee 
of the disk 5, or rarely 4. [P. linifolia Less. P. Les singit Fernald. ] Pin 
lands and sand- dunes, S pen. Fla. and the Keys. — (HW. I): 
104. ACHILLEA (Vaill.) L. Perennial, usually copiously pale-pu- 
bescent, herbs. Leaves alternate: blades coarsely toothed to thrice-pinnatifid. 
Heads several or numerous, rather small, in corymbs or corymbiform panicles. 
Involuere hemispheric, campanulate, or obovoid: bracts imbricate in 3 or 4 
series, the outer the smaller. Receptacle conie or vex, chaffy, the chaff 
membranous, broa ay-flowers 5-12, pis a id ucing: corollas 
with short and ot white, pink or purple, or rarely yellow ligules. Disk- 
flowers 15-75, perfect, fruit-producing: clas pt ee sy or straw- 
colored, the tube equaling or longer than the throat. Achene ellipsoid or obo- 
void, callous-margined. appus wanting.—About 75 species, in the Northern 
emisphere, mostly in the Old World.—Spr.—fall—MILFoILs. YARROWS. 
Ultimate leaf-segments linear or nearly so: ligules of the ray 
white. 1. A. occidentalis. 
Ultimate s -segments ovate or lan 
igules of the ray purplish: eae conspicuously punc- 
TA the ultimate segments strongly callous-thickened 
toward the a apex 2. A. asplenifolia. 
Ligules of the ray "white or rarely pink: leaf-blades not con 
spicuously punctate, the mimos segments not callous- 
thickened toward the apex 3. A. Millefolium. 
1. A. occidentalis Raf. Stem E 10 dm. tall, silky-villous, mostly simple: 
leaves sparingly villous; rachis rely margined ; ultimate eee linear or 
nearly so: bracts of the invo wn re elliptie, 
often broadly so, to elliptic- -lanceolate, the 
outer obtuse, the inner acute, all erose- 
ciliate at i. apex: ligules 2 mm. wide: 
2—2.0 mm. lo 
ow ve Pers nearly 2 mm. io ea 
00 lea ast 
places, various DA Fla. to Ark., Colo. 5 
Minn., and Mas 
asplenifolia Vent. Ste 5-6 dm 
tall, ‘nearly glabrous or ios silky- 
villous, sometimes branched above: ud 
labrous 
rachis winged; ultimate segments bus 
late: bracts of the involucre ovate to ellip- 
