360 COMPOSITZ GAILLARDIA 
with short narrow tube, enlarged cylindraceous throat and 5 ovate- 
triangular to subulate teeth or lobes which are beset with jointed . 
hairs. Style-branches with a penicillate tuft at the summit of 
the stigmatic portion, thence produced into a filiform or shorter 
appendage. Receptacle convex to globose, beset with setiform 
or subulate or rarely small dentiform fimbrille among the flowers. 
Achenes turbinate, 5-costate, covered with long villous hairs 
which usually rise only from its base. Pappus conspicuous, lon- 
ger than the achene, of 5-10 hyaline-scarious scales, with a costa 
mostly excurrent into an awn. | 
G. aristata Pursh FI. ii, 573. Pubescent with jointed hairs: stems 1-2 
feet high, few to many from the crown of a thick perennial root: leaves of 
firm texture, lanceolate or broader, or the lower spatulate, from entfre to 
laciniate-dentate or sinuate-pinnatifid mostly obtuse, 2-5 inches long: 
bracts of the involucre lanceolate or narrower, callous at base, more or less 
hirsute; rays all gations in the larger heads 18 lines long, neutral; disk- 
corollas brown, the subulate acute lobes tipped with a seta or cusp, extern- 
ally beset with long hairs; scales of the pappus slender-awned: fimbrillae 
of the receptacle setiform, surpassing the villous achenes. Stream-banks 
and plains, Brit. Columbia to California and Minnesota. 
Tribe vi. ANTHEMIDE4 Cass. Opusc. ii, 161. Heads homo- 
gamous with the flowers all tubular and hermaphrodite or more 
commonly heterogamous with the pistillate flowers ligulate and radiate 
or sometimes with corolla reduced to a tube, or obsolete. Receptacle 
either naked or with some chaffy bracts. Bracts of the involucre im- 
bricated, wholly or partly dry and scarious or scale-like, not foliace- 
ous, seldom herbaceous, Anthers without tails at base. Style-bran- 
ches of the hermaphrodite flowers truncate, and sometimes with obscure 
conical tips. Achenes usually small and short, with no pappus, or 
a paleaceous crown, ora circle of sguamelle. 
* Receptacle with chaffy bracts subtending some or all of the disk- 
flowers: heads radiate or the rays wanting in certain species: involucre 
of comparatively small imbricated bracts, the outer successively shor- 
ter: receptacle convex to oblong: style-branches truncate-penicillate 
70 eRe o> Involucre broad: rays large: achenes 4-5-angled or 8-10- 
ribbed, 
71 Achillea Involucre narrow: rays small: achenes ohcompressd. 
* * Receptacle without chaff or bracts among the flowers. 
+ Heads comparatively large, radiate, or rarely discoid, pedunculate 
and solitary at the summit of the branches. 
72 Matricaria Flowers in our species all alike and perfect: receptacle 
high-conical : achenes angled, truncate at the apex. 
73 CuHryYsaNTHEMUM Rays numerous and conspicuous: receptacle flat or 
convex: achenes several-ribbed or angled. 
+ + Heads sessile, discoid, heterogamous ; pistillate flowers most 
st ear apetalous, their achenes pointed with an indurated persis- 
tent style. 
74 Soriva Rays none: receptacle flat: achenes obcompressed, with 
