ORDER LXVIII. COMPOSir.E. 3^0 



44. S. salici'na, (Ell.) Stem erect, slender, pubescent when young, 

 nearly glabrous when old, with long, erect, virgate branches. Leaves 

 s^-Ssile ; the lower ones long, narrow-hmceolate, scabrous on the upper 

 sui'face, glabrous vn the under; upper leaves smaller. Floicer-s in long, 

 slender racemes; involucre with oblong scales; ray florets slender, gen- 

 erally 5.— Yellow. 2^. Sept.— Oct. Middle Geo. 4—5 feet. 



S. patula, MuhL 



45. S. ela'ta, (Pursh.) Stcjn erect, terete, pubescent, with erect, to- 

 mentose branches. Leaves sessile, oval-lanceolate, acute, tomentose be- 

 neath, nearly entire. Flowers in erect, paniculate racemes; involucre 

 with pubescent, linear-lanceolate scales; ray florets 7 — 10. /5Vf(/ gla- 

 brous.— Yellow. If. Sept.— Oct. Middle Geo. 2—3 feet. 



S. peiiolaris. 



46. S. rig'ida, (L.) Sfe))i erect, slightly angled, tomentose when 

 young; branches numerous, fastigiate. Leaves ovate, sessile, pubescent, 

 scabrous; upper ones entire, the lower serrate. Flowers clustered near 

 the summit of the branches, large ; involucre with oblong, pubescent 

 scales; ray florets 7 — 10, those of the disk numei'ous. iSeet/ glabrous. 

 —Yellow." If. Sept.- Oct. Mountains. 3 — i feet. 



47. S. graminifo'lia. (Ell.) Ste7n angled, slightly furrowed ; bianch- 

 es numerous, expanding ; angles pubescent. Leaves linear, nunurous, 

 obscurtly veined, pubescent along the veins on the under surface. 

 Flowers in fastigiate, terminal corymbs ; involucre with numerous, vis- 

 cid, liuear-lanceoiate scales; ray florets 10, short. Seech villous. — Yel- 

 low. If. Sept. — Oct. Damp rich soils. 2 — 3 ft. S. lafieeolala, L. 



48. S. tenuifo'lia, (Pursh.) Stem erect, angled, scabrous, with fas- 

 tigiate branches. Leaves linear, expanding, ob^curely veined, scabrous, 

 clusters of small leaves in the axils. Flowers in fastigiate, terminal co- 

 r^-mbs ; involucre with viscid scales; ray florets about 10, very short. 

 Seed villous. — Yellow. If. Sept. — Oct. In dry pastures. Very 

 common. 3 — 4 feet. 



Genus XXIL— BIGELO'VIA. D. C. 



(In honor of Dr. Bigelow, of Boston.) 



Heads few-flowered, the florets all perfect, tubular. Involu- 

 cre oblong, scales few, erect. Receptacle naked, narrow, with a 

 setaceous scale among the central flowers, equaling the achenia. 

 Achenia oblong, pubescent. Pappus pilose, in one series. 

 Herbaceous plants, with alternate entire leaves. Heads in co- 

 rymbs, flowers yellow. 



1. B. nuda'ta, (D. C). Stem erect, glaltrous, brandling near the 

 Bummit. Radical leaves sj;atulate, lanceolate, acute, 3-nerved, entire, 

 glabrous ; cauline leaves with the upper ones small and linear. Flowers 

 in a compound fastigiate corymb; involucre with appressed linear 

 leaflets, colored, containing 3 — 4 flowers. Sti/le about the length of the 

 stamens, 2-cleft; pappus unequal. — Yellow. If. Oct. — Nov. Com- 

 mon. 1 — 2 feet. Chrysocoma nudata, Mich. 



Genus XXIII.— ISOPAP'PUS. T. & G. 

 (From ixos, equal, &a6. pappiis, from the equality of the pappus gristles.) 



Heads many-flowered; rays 5 — 12, ligulate, pistillate; disk 



