210 COMPOSITE. SoLiDAGO. 



31. S. Riddellii (Frank) : stem stout, glabrous, corymbose at the summit, 

 the branches and pedicels pulverulent-pubescent ; leaves lanceolate, elonga- 

 ted, acute, entire, glabrous, with scabrous margins, obscurely nerved ; the 

 radical on long carinate petioles; the cauline partly clasping or sheathing, 

 carinate-conduplicate, mostly arcuate; heads (middle-sized) very numerous, 

 clustered, forming a compound fastigiate corymb, 20-24-flowered. — Frank ! 

 in Riddell, synops. I. c. S. Mexicana /3. floribus lato-corymbosis, Hook. ! 

 compan. to hot. mag. l.p. 97. 



Wet and grassy prairies, Ohio, Dr. Riddell ! Mr. Van Cleve! Dr. Pad- 

 dock ! Mr. Lea ! St. Louis, Missouri, Drummond ! Dr. Enselmann ! 

 and on St. Peter's River, Mr. Nicollet! Wisconsin, Mr. Lapham .' Sept.- 

 Oct. — Stem about 2 feet high, very leafy to the summit. Leaves ^^-ith a ra- 

 ther strong midrib, and 1 to 3 more or less distinct parallel nerves, forming 

 numerous" reticulations with the minute and close veinlets, thin but rather 

 firm in texture; the radical a foot or more in length, including the elongated 

 petioles, into which the limb (6-9 lines wide in the middle) is gradually at- 

 tenuated, often falcate ; the cauline 4-8 inches long, about half an inch 

 wide, erect, appressed and partly sheathing at the base, above arcuate-spread- 

 ing or recurved. Heads rather larger than in the preceding, much crowded 

 on the branches of the large compound corymb, usually on short pubescent 

 pedicels. Scales of the involucre narrowly oblong, 1-nerved, nearly gla- 

 brous. Rays 7-9, small and narrow. Achenia glabrous, or slightly and 

 sparsely pubescent under a lens. — A beautiful and very distinct species, al- 

 lied to the preceding. 



t t t Scales of the involucre obtuse : achenia glabrous : leaves nerved : rays 2-3. 



32. S. nitida: stem strict, very smooth below, fastigiate-corj^mbose at the 

 summit ; the branches and pedicels scabrous-pubescent ; leaves rigid, very 

 smooth and shining, nerved, lanceolate or linear, entire, acute, the margins 

 ciliolate-scabrous towards the apex ; the radical and lowest cauline tapering 

 into short petioles; the others sessile ; heads (middle-sized) in loose fastigiate 

 corymbs, about 14-flowered. 



Dry pine woods &c.. Western Louisiana, Dr. Leavemvorth ! Dr. Hale! 

 and Texas, Drummond ! Dr. Leavemvorth ! Aug.-Oct. — Stem 2-3 feet 

 high, slender or rather stout, simple, and terminated by a single fastigiate 

 corymb, or somewhat branched near tlie summit; the branches rigid, erect, 

 fastigiate, clothed with a short rough pubescence. Leaves varying from line- 

 ar to rather broadly lanceolate, coriaceous, both surfaces very smooth and 

 shining (the margins also smooth towards the base), rarely with one or two 

 obscure serratures near the apex, furnished with 1 to 3 nerves or parallel 

 veins on each side of the rather strong midrib ; the radical and lowest cauline 

 4-8 inches long, 3-5 lines wide ; the upper gradually reduced in size, nume- 

 rous, spreading, sessile, but mostly narrowed at the base. Scales of the in- 

 volucre nearly glabrous, oval, very obtuse. Rays 2-3, large. Achenia 

 perfectly glabrous. — The leaves vary in width in different specimens from 

 2-3 lines to three-fourths of an inch. The plant exudes small quantities of 

 resin when wounded. 



33. S. pumila : stems several from a woody caudex, scarcely longer than 

 the radical leaves, simple, angular ; leaves rigid, lanceolate, entire, tapering 

 to each end, mucronate-acule, smooth, somewhat glutinous, strongly 3-nerved; 

 the radical petioled ; heads (large for the size of the plant) in sessile clusters 

 of 3-4 together, disposed in a small corymb ; scales of the somewhat viscid 

 and cylindrical involucre oval or oblong, carinate ; rays 2-3, short ; the disk- 

 flowers about the same number. — Chrysoma pumila, Nutt. ! in trans. Amer. 

 phil. soc. (n. ser.) 7. p. 325. 



