400 COMPOSITE. Pectis. 



California, Coulter, No. 330. Arizona, Dr. Palmer. Involucre 2 or 3 lines long ; the whole 

 head 4 or 5 lines long, rather few-flowered. 



3. P. filipes, Gray, 1. c. Annual, slender and diffuse, glabrous : leaves narrowly 

 linear (an inch or more long, seldom a line wide), sparingly bristle-fringed at base : 

 peduncles capillary, one or two inches long : scales of the involucre" 5, rather broadly 

 linear, obtuse : rays exserted, oblong : disk-flowers about 5 : akenes slender : pappus 

 of about 2 (1 to 3) slender awns which are gradually slightly dilated at base and 

 minutely scabrous towards the apex, in the disk sometimes a minute crown with a 

 solitary awn. 



California, Coulter, No. 329. New Mexico, Thurber, Biyclow, Henri/. Janos, Chihuahua, 

 Schott. Involucre narrow, 2 to 2| lines long. Only Coulter's plant shows the short crown of 

 the disk-pappus. There is no trace of it, and the awns are 2 or 3, in the other specimens, which 

 are from a district farther east than that probably traversed by Coulter. Bentham thinks it 

 likely to be P. Taliscana, Hook. & Arn. ; but it does not accord with the character of that 

 species. Probably it has not been collected within California. 



TRIBE VII. ANTHEMIDE^E. 



Distinguished from Helenioideoe by the drier more scariously margined or tipped 

 and imbricated scales of the involucre ; from Asteroidece by the same and by the 

 truncate tips of the style in the perfect flowers, never continued into an appendage ; 

 the pappus none or a mere crown. Belonging mainly to the Old World, very few 

 in Western North America, except of Artemisia. 



89. ACHILLEA, Linn. YARROW. 



Head many-flowered, with few or several pistillate rays ; all the flowers fertile. 

 Scales of the narrow involucre imbricated in few series, appressed, mostly with 

 scarious margins. Eeceptacle from flattish to conical, with thin chaff subtending 

 the flowers. Eays mostly short or broad. Akenes oblong or obovate, obcompressed, 

 surrounded by a narrow and cartilaginous margin, destitute of pappus. Perennial 

 nerbs (numerous in the Old World, but very few in the New), rather strong-scented; 

 with alternate either serrate or pinnately dissected leaves, and small corymbose 

 heads of yellow or white or sometimes rose-colored flowers. 



1. A. Millefoliuni, Linn. A foot or two high, or lower on mountains, villons- 

 woolly at least when young : leaves lanceolate or linear in general outline, twice 

 pinnately parted into fine linear acute and 3 - 5-cleft lobes : heads small, crowded 

 in a compound corymb-like cyme : rays 4 or 5, obovate, white, rarely rose-color 

 (occasionally becoming tubular) : akenes slightly margined. 



Common in the Sierra Nevada up to 11,000 feet, extending through all the mountains north- 

 ward and eastward ; not rare in the western part of the State at the level of the sea ; there 

 perhaps introduced from the Old World ; but clearly indigenous all round the northern hemi- 

 sphere. 



90. ANTHEMIS, Linn. CHAMOMILE. 



Head many-flowered, with numerous pistillate or sometimes neutral rays ; the 

 disk-flowers fertile. Involucre hemispherical ; the scales very numerous, imbricated 

 and appressed, scarious-margined, with a more rigid centre. Receptacle from con- 

 vex to oblong-conical, chaffy with slender or thin scales or awns, subtending the 

 flowers, at least the central ones. Rays commonly conspicuous. Akenes obovoid 

 or oblong, 4 5-angled, 8-10-ribbed, or many-striate, truncate at the apex. Pappus 



