364 COMPOSITE. Hemizonia. 



§ 2. Fertile ahenes slightly oblique and with depressed terminal areola liardly eccen- 

 tric, glabrous, smooth and even, obovate and obsciirehj triangidar, inserted by 

 a minute injlexed stipe, mostly in tioo series : heads (corymbose) many-jlowered, 

 and with consjncuous strongly d-lobed rays (expanding in sunshine) : recepAacle 

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

 tute of p>appus. — EuHEMizoNiA, Gray. (Hemizonia, DC, as to tlie typical 

 species of both sections.) 



10. H. COngesta, DC. Somewhat coryinbosely 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 foliaceous tips : outer series of chaff of the 

 receptacle somewhat similar 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 Mdiite 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. luzulaefolia, DC. Corymbosely or paniculately much branched, a span 

 to 2 feet high, villous, or Ijelow lloccose-woolly Avhen young, above Itecoming 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 

 pink. — R. sericea. Hook. & Am. //. rndis, Benth. Bot. Sulph. ; a much-branched 

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

 and silky-woolly Luzula-like lower leaves gone. 



Dry 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. fntfiarimdcs, Kellogg, Proc. Calif. Acad. ii. 70, fig. 14, ai)pears 

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

 strawberries." 



§ .3. Akenes of disk mostly tvell-formed and sometimes the outermost tridy fertile (then 

 hairy), tiirhinate-quadrangidar or slightly obcompressed, straight, furnished 

 with a consjncuous chaffy pappus; of the ray obovoid-triangidar, slightly 

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

 broad, X)almately 3-lobed or parted: heads narrow, small: recex)tacle small 

 and flat, the herbaceous chaff only between the ray- and disk-flowers : leaves 

 entire and narrowly linear with revolute memjins, or filiform, or those in 

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

 tipjied, and sometimes beset on the back, with disk-like or when dry scmcer- 

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

 CADENiA, Gray. (Calycadenia, DC.) 

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

 •!- JJisk-shaped glands none : ray-akenes apicidate 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 loAver 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 piu'ple : ray-akenes 

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



