COMPOSITAE. 931 



somewhat compressed. 1-2 -ribbed on each side. Pappus of I or 2 series of 

 numerous capillary unequal bristles. [Greek, cartilage-bearing.] One, or per- 

 haps two species, of eastern N. Am. 



i. Chondrophora nudata (Michx.) Britton. RAYLESS GOLDENROD. (I. F. f. 

 3661.) Glabrous, erect, simple, 37 dm. high. Lower and basal leaves spatulate, 

 obtuse, or obtusish, 715 cm. long, 612 mm. wide, attenuate into a margined peti- 

 ole; stem leaves distant, small, linear or subulate; heads numerous, 4-6 mm. high, 

 crowded in a compound terminal corymbose cyme; involucre narrowly campanu- 

 late, acute at the base, its bracts coriaceous, appressed, linear-oblong, imbricated 

 in 3 or 4 series, the outer much smaller than the inner. In moist pine-barrens, 

 N. J. to Fla. and Tex. Aug. -Oct. [Bigelovia nudata DC.] 



Chondrophora nudkta virgkta (Nutt.) Britton. Lower leaves linear, shorter, or the 

 basal ones linear-spatulate. Perhaps specifically distinct. With the type, southward, 

 not certainly known north of N. Car. 



16. CHRYSOTHAMNUS Nutt. 



Low shrubs, with equably leafy branches, hard wood, linear leaves, and discoid 

 heads of yellow perfect flowers. Heads narrow, 5-7-flowered. Involucre oblong 

 to narrowly campanulate, its bracts more or less keeled, thin, or papery, imbri- 

 cated in several series, often so as to form 5 vertical rows. Corolla 5 -toothed. 

 Anthers obtuse at the base. Style-branches exserted, their appendages subulate to 

 filiform. Achenes narrow, mostly pubescent. Pappus of copious capillary rough- 

 ened bristles. [Greek, golden-bush.] About 25 species, of western N. Am. 



Heads about 12 mm. high; involucral bracts obtuse or mucronulate. i. C. nauseosus. 

 Heads 14-20 mm. high; involucral bracts^subulate-tipped. 2. C. Howardi. 



1. Chrysothamnus nauseosus (Pursh) Britton. FETID RAYLESS GOLDEN- 

 ROD. (I. F. f. 3662.) Densely white-tomentose. at least when young, much 

 branched, very leafy, 3-12 dm. high, odorous. Leaves linear, or slightly spatu- 

 late, 2-5 cm. long, 2-4 mm. wide; heads 10-15 mm. high, very numerous and 

 crowded in terminal compound corymbose cymes; rays none; involucre narrowly 

 campanulate, acute at the base, its bracts oblong or linear-oblong, acutish, puberu- 

 lent, imbricated in about 4 series; achenes linear; pappus-bristles soft, copious. 

 In sterile soil, N. W. Terr, to Neb., N. Mex., Br. Col. and S. Cal. Aug. -Oct. 



2. Chrysothamnus Howardi (Parry) Greene. HOWARD'S RAYLESS 

 GOLDENROD. (I. F. f. 3663.) Densely white-tomentose when young, glabrous or 

 nearly so when old, tufted, much branched, 1.5-2.5 dm. high. Leavec narrowly 

 linear, entire, 2-5 cm. long, about 2 mm. wide; heads narrow, 5-flowered, more 

 or less glomerate, usually surpassed by the upper leaves; involucre slightly pubes- 

 cent, or glabrous, its bracts lanceolate, thin, acuminate or subulate-tipped; achenes 

 nearly linear, pubescent. In dry soil, western Neb., Colo, and Utah to N. Mex. 

 July-Sept. 



17. OONOPSIS Greene. 



Perennial herbs, the following species glabrous, mostly tufted, with woody roots, 

 the stems leafy to the top. Leaves entire, linear to lanceolate. Heads cymose at 

 th^ end of the stem or branches. Involucre campanulate to ovoid, its bracts flat, 

 imbricated in several series, herbaceous, cuspidate, appressed and erect, or the outer 

 spreading. Disk-flowers with a nearly cylindric 5 -toothed corolla. Stamens and 

 style included or scarcely exserted. Ray-flowers present or wanting, pistillate. 

 Style-appendages ovate to subulate. Achenes glabrous, or somewhat pubescent. 

 Pappus-bristles coarse, rigid. [Greek, resembling an egg, referring to the ovoid 

 involucre.] Four known species, natives of central N. Am. 



I. Oonopsis Engelmanni (A. Gray) Greene. ENGELMANN'S OONOPSIS. 

 (I. F. f. 3664.) Perennial by a deep woody root, glabrous throughout; stems stiff, 

 about 2 dm. high, densely leafy. Leaves narrowly linear, sessile, 18-35 mm - l n g> 

 less than 2 mm. wide, brittle when dry; heads clustered, or sometimes solitary at 

 the ends of the branches, about I cm. wide, sessile among the upper leaves; in- 

 volucre oblong-campanulate, its bracts in about 4 series, oblong to spatulate, short- 

 acu:nintte or mucronate, appressed; ray-flowers none; achenes linear- oblong, nar- 

 rowed .it the base, many-striate. Western Kans. and Neb. Sept.-Oct. 



