DICOTYLEDONOUS PLANTS 183 



Keceptacle naked or hairy. Akenes ohovate, ivith a small disk 

 at top, hut luithout paj^pus. These have inconspicuous flowers, 

 often an aromatic odor, and they bloom in the falL 



a. A. vulga'ris var. Californica Besser. Mugwort. Stems simple 

 and taU. Upper leaves toothed or entire, lower 3-5-parted, green on 

 the upper surface, ichite-woolly below. This grows in gulches and 

 along streams, and is widely distributed. 



b. A. Califor'nica Less. Fleabane. Shrubby, w ith many branches 

 from a woody base, 3-4 ft. high, forming a clump. Entire plant 

 white-pubescent. Leaves pinnately divided into thread-like divisions. 

 This grows on dry hills and is pleasantly aromatic. Common from 

 San Francisco southward. 



XXXV. COT'ULA, Brass-buttons 



Small introduced annual herbs, having heads without rays. 

 Bracts of the involucre nearly equal, papery on the margins, 

 in 2 ranks. Receptacle flat, naked, papnllose. Akenes flat- 

 tened, with spongy margins. Pappus none. Flowers yellow. 



a. C. coronopifo'lia L. Smooth, wdth creeping stems and rather 

 fleshy leaves, which are lanceolate, irregularly pinnatifid, toothed or 

 entire, with broad, clasping base. Heads ^ in. in diameter, flat on 

 top, the bright-yellow disk floivers very numerous. This grows in w^et 

 places, and is very common near the coast. 



b. C. Australis L. Smaller than the preceding, hairy. Leaves 

 twice pinnately parted into linear divisions. Heads very small, with 

 flowers greenish. This grows along the streets and in waste places. 



Tribe 8. Sexecioxid'e^. Similar to Helianthoidece, but 

 the pappus is abundant and capillary, and the receptacle is 

 without chaffy scales. 



XXXVI. AR'NICA 



Perennial herbs with creeping rootstocks, and simple stems 

 bearing a few rather large heads of yellow flowers on long 

 peduncles and usually a few opposite, entire or toothed leaves. 

 Involucre bell-shaped, of linear or lance-shaped equal scales in 

 one or two series. Rays elongated or sometimes wanting. 

 Pappus a single row of stiff, bearded, capillary bristles. 

 Akenes linear, 5-angled, or ribbed. 



