364 COMPOSITE. Hemitonia. 



§ 2. Fertile akenes slightly oblique and with depressed terminal areola hardly eccen- 

 tric, glabrous, smooth and even, obovate and obscurely triangular, inserted by 

 a minute inflexed stipe, mostly in tivo series : heads (corymbose) many-flowered, 

 and with conspicuous strongly 3-lobed rays (expanding in sunshine) : receptacle 

 convex, chaffy throughout, the inner chaff very thin : dislc-akenes abortive, desti- 

 tute of pappus. — Euhejiizonia, Gray. (Hemitonia, DC, as to the typical 

 species of both, sections.) 



10. H. congesta, DC. Somewhat corymbosely or paniculately branched 

 above, a foot high, rather villous than hirsute with long mostly soft hairs, slightly 

 glandular towards the summit : leaves linear or linear-lanceolate, entire, or the 

 lower (commonly opposite) oblanceolate and sparsely serrulate : heads rather few : 

 scales of the involucre with lanceolate foliaceons tips : outer series of chaff of the 

 receptacle somewhat simdar to the scales and distinct or partly united : rays light 

 yellow. 



Low ground, in the western part of the State, Douglas, &c. Head, including the expanded 

 broad rays, about an inch in diameter. This species is insufficiently known. Some specimens 

 which have been referred to it prove to have white rays, and to be a less glandular and more 

 villous form of the next ; from which, however, the yellow flowers ought to distinguish the 

 present species. 



11. H. luzulasfolia, DC. Corymbosely or paniculately much branched, a span 

 to 2 feet high, villous, or below floccose-woolly when young, above becoming very 

 glandular and viscid : leaves linear, entire or merely denticulate, the lower elongated 

 and 3 — 5-nerved : heads numerous, middle-sized or small, mostly on short naked 



• peduncles : scales of the involucre with short herbaceous tips : outer series of chaff 

 united into a cup : rays (6 to 10) and disk-flowers white, sometimes tinged with 

 yjink. — H. sericea, Hook. & Am. H. rudis, Benth. Bot. Sulph. ; a much-branched 

 summer state, with small beads and small very glandular upper leaves ; the long 

 and sdky-woolly Luzula-like lower leaves gone. 



Diy open grounds, common throughout all the western part of the State, and veiy variable, 

 especially in the size and number of flowers in the head ; blooming continuously from April 

 or even March till November. Involucre from 5 or 6 to 2 lines high : rays from 5 to 2 lines long, 

 broadly cuneiform. The var. fragarioulcs, Kellogg, Proc. Calif. Acad. ii. 70, fig. 14, appears 

 not different from the ordinary form of the species, but is said to have "the refreshing odor of 

 strawberries." 



§ 3. Akenes of dish mostly xoell-formed and sometimes the outermost truly fertile (then 

 hairy), turbiuate-quadrangular or slightly obcompressed, straight, furnished 

 with a conspicuous chaffy pappus ; of the ray obovoid-triangular, slightly 

 oblique, and the terminal areola little if at all eccentric : rays 1 to 7, very 

 broad, palmately 3-lobed or parted: heads narrow, small: receptacle small 

 and fiat, the herbaceous chaff only between the ray- and dish-flowers : leaves 

 entire and narroioly linear with revolute margins, or filiform, or those in. 

 axillary fascicles and clusters about the heads subulate, but obtuse, commonly 

 tipped, and sometimes beset on the back, with disk-like or when dry saucer- 

 shaped and either sessile or short-stipitate glands (whence the name). — Caly- 

 cadenia, Gray. (Calycadenia, DC.) 

 * Diffusely paniculate-branched : branches filiform : chaff of the receptacle united. 

 +- Disk-shap>ed glands none : ray-akenes apictdate at both ends, rugose. 



12. H. tenella, Gray. A span to a foot high, minutely glandular, also sparsely 

 hispid when young : leaves linear-filiform, the lower an inch or two long, upper- 

 most reduced to filiform bracts : heads terminating the very numerous and widely- 

 spreading filiform branchlets, cylindraceous : rays 3 to 5, white, 3-parted down to 

 the long and slender tube ; disk-flowers 5, white marked with purple : ray-akenes 

 glabrous, rugose, raised on a short stipe and tipped with, a short and thick truncate 



