Li/;p(hsni in. CO M 1 'OS I TA>]. ,j 4 ] 



slcndor glabrous peduncles : leaves oblong or oblong-spatulatn, often denticuhitc or 

 repand-tnothed, sparsely or tlie lower thickly beset with long and spreading villous- 

 hisi)id bristles, as is tiio bas(» of tiio stem : involucre narrow, about 2()-llowercd, 

 smooth and glabrous or beset with some scattered long bristles, not glandular : 

 corollas Avhite. — //. argutum, JNutt. 1. c. (!), from Sta. IJarbara. 



Open woods ; common throngh the State from Snn Dii-RO Co. nortliwani, and in the loot- 

 hills of the Siena Nevada; extending to Hiitisli Columl)iii and eastward to the Hocky Moun- 

 tains. Involucre 3 to 5 lines long. Akencs a line and a half long, cvcidy and strongly striate- 

 ribbed. 



5. H. triste, Willd., var. gracile, firay. Slender, a span or two high : stem 

 1 - 2-leaved or sometimes nearly lealless, bearing few heady, tomentose-puberulent 

 or almost glabrous below : the suminit or peduncles and involucre villous or hirsute 

 with long and blackish hairs : leaves oblong-spatulate, entire or denticulate, taper- 

 ing into a slender petiole : corollas yellow. — //. gracile, Hook. 1. c. ; Fries, Symb. 

 & Epicrisis Ilierac. 



Var. detonsum, dray. A form destitute or nearly so of the dark soft hairs 

 even on the invohicre, or with scattered and more bristly and sometimes glandular 

 ones in their place ; the heads rather smaller. 



Ebbett's Pass, Sierra Nevada, at 8,000 feet {Brewer), the var. Hrtnnsum ; also in the Rocky 

 Mountains and in Oregon, accompanied by and nassing into the black-headed form of the northern 

 Rocky and Cascade Mountains, //. {jracilr, Hook. This in turn clearly i)a3ses into the Alaskan 

 H. triste. ; which has very long and dense daik gray hairs to the heads, shorter stems, and hir- 

 sute upper leaves. 



122. LYGODESMIA, Don. 



Head few-flowered. Involucre cylindri(;al or cylindraceous, of 4 to 8 narrow 

 membranaceous scales in a single series, with a fcnv short calyculate ones at base, or 

 rarely more unequal and imbricated. Receptacle flat, naked. Akenes linear, terete, 

 5-striato or ribbed (the ribs mostly broad and low, separated by narrow grooves), 

 often tapering at summit, but not truly beaked, the callus at base hollowed at the 

 insertion. Pappus of copious barely scabrous capillary bristles, either rather soft or 

 rigid, dull white or sordid, persistent. — Low perennials (rarely annuals or bien- 

 nials), palo and glabrous ; with slender and rather rigid either rush-like or divari- 

 cate striate branches, narrow entire or laciniate-pinnatifitl leaves, the ui)per mostly 

 reduced to subulate scales or bracts, and small or middle-sized heads of rose-colored 

 flowers. — Benth. & Hook. Gen. PI. ii. 530; Gray, Proc. Am. Acad. ix. 217. 



A genus of five or six species, natives of the dry interior region, except that one species inhab- 

 its Texas and Florida ; in the flowers and general aspect resembling St^plianoineria, but with a 

 simple scabrous pappus. One species has been collected just within the bonlers of the State : 

 another approaches so nearly that it may claim admission. 



1. L. juncea, Don. Perennial, copiously and corymbosely l)ninc.hed from the 

 base, about a foot high, rigid: lower leaves linear-subulate, an inch or two in length, 

 entire, the upper all reduced to little scales or brartlets : heads nHowered, hnlf an 

 inch long, erect at the summit of the simple brancdilets : liguk^s oblong : i)appus 

 line and soft. 



Unionville Valley, Nevada {Watson), thence eastward to the Missouri River. Involucre of 

 equal scales and a few calyculate ones at base, as in all the species except the next. 



2. L. spinosa, Nutt. Perennial, or possibly bienninl, the root or crown sur- 

 mounted by a dense tuft of wool : stems divergently and often tortuously much 

 branched, rigid, and the branches spinescent : lower leaves linear, entire or slightly 

 toothed; upper ones suludate and on the branrhlets rediieed to ininute scale,««: liends 

 3-5-Howered, small, on short lateral peduncles or spurs : involucre of few unequal 



