Ihmizonia. COMPOSITE.. 363 



* * Receptacle faf, luith a distinct chaff for each of the 8 or 10 disk-flowers half en- 

 closing Its sterde akene : heads small : rays 5 ; akenes smooth and even, but dull. 



(5. H. Virgata, dray. More or loss gl.andular, but f^'labrous or slightly liii-siite • 

 8tera slciuler, a f.x.t or two high, siini.lc or virgatcily l)ranche(l : caulinc leaves 

 linear; tho lower laciniate or ahnost pinnatifid ; up[.er entire ; those of tlie branches 

 and of axdlary fascicles very small (2 or 3 lines long), (crowded, each tii>i)ed with 

 a truncate gland : heads numerous, virgately racemose : corollas glandular, the 6 

 ligules short and broad : scales of tho involucre and the similar chaff of the recep- 

 tacle rather chartaceous, obovate or oblong, consjjicuously beset over tho back with 

 largo and prominent tack-shaped stijiitato glands : akenes obovate, 5-an<rled • pannus 

 none. — liot. Hex. Bound. 100. "" 



Foot-hills, fee, from Napa to Los Aiigeles. Heads narrow, 3 or 4 lines long ; tl.o glands often 

 a Jnll ha ( Ime m Icngtli, resembling those of the section Cahjcadniia. Tlie gland terminating 

 the smaller leaves is more or less cup-shaped in tlie dried specimens. Disk-akencs almost fertile 

 1 he plant exhales a balsamic odor. 



* * * Receptacle convex or conical, manrj-floivered, chaff 1/ tliron</hont ; the cliaff distinct. • 

 heads middle-sized : rays rather nnmerons, and usually in more than one series, 

 short, apparently pale yellorv : akeiies hardly if at all ruyose, those of the disk 

 some of them more or less fertile {these with a depressed central terminal areola). 

 — (§ Olocarpha, DC, excl. sp.) 



7. H. macradenia, DC. Loosely branched, a foot or two high, stout, hirsute 

 and viscid-glandular : lower caulino and radical leaves laciniato-pinnatilid ; the others 

 narrowly linear; uppermost and those of the axillary fa.scicles filiform-subulate, 

 tipped with a truncate gland : heads mostly glomerate at the end of tho branches : 

 scales of the involucre and some of tho chalf beset on tho back with large long- 

 stipitate glands : rays roundish-cuneiform, 3-lobed : fertile akenes obovate, 5-angled, 

 short-beaked from the inner angle : receptacle strongly conical : pappus none. 



Dry open ground, from tho Bay of San Fnincis(;o southward. One of the commoner "Tar- 

 weeds," exuding a heavy-scented viscid matter, which blackens the noses of horses. Notwith- 

 standing its frutescent aspect, the root is annual, or at most biennial. 



8. H. pungens, Torr. & Gray. Simple and at length much branched, a span 

 to nearly a yard high, hirsute or sparsely hispid : caulino leaves pinnatilid, or the 

 lower bipinnatifid with short spinulose-acnminato lobes ; those of tho branchlots 

 and fascicles entire, small and crowded, lancoolatn or iinear-subulato, rigid, spinn- 

 lose-tii>[)cd, ns are the scales of the Icufy-bracted involucre and tho narrow chaff of 

 the receptacle: rays scarcely exceeding the disk, narrow, 2-3-toothcd: j>appus 

 none : receptacle strongly convex. — Ilartmannia punqen.9. Hook. ^- Am. ; Hook 

 Ic. PI. t. 334. 



Dry hillsides, from San Francisco southward to San Diego, where a very sparingly hirsute form 

 occurs. The root of this species also is annual. Akenes as in the preceding, but smaller. 



9. H. Fitchii, Gray. Panicnlately branched, rigid, a span to a foot high, villous 

 or somewhat hirsute : radical leaves 1 - 2-pinnately parted into few linear or subu- 

 late divisions ; caulino leaves (or the upper ones) like those of the branches, sub- 

 ulate-linear (about an inch long), rigid and spinulose-tipped, very pungent, tho 

 villous jiubescence generally accomjianied with small very long-stalked glands : 

 heads foliose-bracteato : scales of the involucre subulate : rays oblong, 2-toothed, 

 little exceeding the disk : chaff of the convex and hairy receptacle pointle.^s, bearded 

 with long villous hairs : fertile akenes obovate, 3-angled, .smooth, very gibbous ; 

 sterile disk-akenes with a pappus nearly equalling their corollas, composed of 8 to 

 12 narrowly linear and rigid chaffy scnlo.>^, wlii(;h arn more or less tinited at baso 

 and fringed or bearded at tip. — Pacif. H. Pep. iv. 108. 



Valley of the Sacramento ; Clear Lake ; Long Valley, Plumas Co., kc, to Carson Valley, 

 Alpine Co. A well-marked species : some younger and less villous forms resemhie //. punqriiji; 

 but the chaff is not pungent, always more or less villous-bennled, nu'l the |»ai>pus is ehiMacteristic. 



