RuuBECKiA. COMPOSITE. 311 



Plains and pine woods, Western Louisiana, especially on the borders of 

 Texas, Dr. Hale ! Dr. Leavcmvorth ! Dr. Carpenter I Texas, Drummond ! 

 June-Aug. — Plant 2-3 feet high, rather slender. Lower leaves 3-6 inches 

 long, 2-3 wide, usuall}' nearly enlire, strongly ribbed and beautifully reticu- 

 lated between the ribs, sprinkled with minute resinous dots, sometimes mem- 

 branaceous and nearly smooth ; the upper all similar in form but smaller 

 and on shorter petioles, or the uppermost sessile. Heads smaller than in 

 R. grandiflora ; the broadish rays an inch or more in length : the chatf, co- 

 rolla, pappus, &c. very similar ; the latter perhaps more conspicuous, as long 

 as the proper tube of the corolla. — Closely allied to the following species. 



10. R. grandijlora (Gmel., DC.) : scabrous-hispid throughout ; stem sim- 

 ple or branching, striate-angled ; the branches naked above, and terminated 

 by solitary (very large) heads ; leaves rigid, very rough; the radical and 

 lowest cauline ovate or oval, somewhat serrate or entire, 7-nerved and reticu- 

 late-veined, on long petioles; the upper lanceolate, unequally and sharply 

 denticulate-serrate, acuminate at each end, 3— 5-nerved, on short petioles, the 

 uppermost sessile ; scales of the involucre numerous, linear, shorter than the 

 ovoid-globose purplish-brown disk, and many times shorter than the numer- 

 ous (20 or more) drooping rays ; chatf of the receptacle rather acute, some- 

 what canescent at the summit, shorter than the corolla; pappus coroniform, 

 crenate or unec[ually toothed, conspicuous. — DC. j^rodr. 5. |;. 556. R. nu- 

 dicaulis, Nutt. 'mss., not of Pers. Centrocarpha grandiflora, Don, in Sweet, 

 Brit. fl. gard. ser. 2. t. 87. 



Dry plains, &c., Red River, Arkansas, Nuttall! Dr. Pitcher ! Dr. Lea- 

 venworth! July-Sept. — Stem stout, 2-3 feet high, thickly clothed, like the 

 both surfaces of the leaves, with short and very rough hispid hairs. Leaves 

 with strong nerves, or rather ribs, running from the base to the apex ; the 

 upper 4-6 inches long, an inch or less wide; the lowermost sometimes 8 

 inches long and 3-4 broad. Heads in the cultivated plant sometimes " near- 

 ly 6 inches across" ; the rays in our indigenous specimens 2 inches long, 

 golden yellow, minutely tomentose-pubescent beneath. Receptacle narrow- 

 ly conical. — The character given by De CandoUe, which is chiefly taken 

 from that of Don, is incorrect in several particulars : the pappus is not very 

 short, but large for a Rudbeckia ; the rays are not hispid beneath, nor is the 

 chatF pungent, or even pointed, in this, or in any of Prof. Don's species of 

 Centrocarj)ha, except R. triloba. 



* * * Disk grecnish-yclloiv, conical, somavhat prolonged tp/ieri mature ; tJie receptacle at 

 length columnar or spiciform : chaff navicular, truncate, someivhat bearded at the 

 summit, not longer than the frismatic aehenia : branches of the style tru7icate, slightly 

 thickened and bearded, at the summit. 



11. R. laciniata (Linn.) : glabrous; stem tall, branching ; leaves minutely 

 hairy and scabrous, particularly on the margins; the radical and lowermost 

 pinnately (5-7-) divided, the divisions 3-lobed or incised, sometimes lacini- 

 ate ; upper leaves irregularly 3-5-parted, with the segments lanceolate or 

 ovate-lanceolate, acuminate, often toothed, or incised ; the uppermost simple, 

 lanceolate or ovate, incisely toothed or entire ; heads (rather large) somewhat 

 corymbose-paniculate ; rays drooping, about twice the length of the ovate- 

 lanceolate scales of the involucre; aehenia prismatic, with a coroniform 

 toothed pappus. — Linn. ! hort. Cliff'., S^- sjoec. 2. p. 906 ; Michx. ! fl. 2. p. 

 144 ; Willd. ! spec. 3. p. 2247 ; Pursh! fl. 2. p. 575 ; Ell. sk. 2. p. 451 ; 

 Bart.fl. Amer. ScjJt. 1. t. 16 ; Darlingt.fl. Cest.p. 481 ; DC. ! jirodr. b.p. 555. 



ji. leaves glabrous, the u])per ones undivided. — R. laevigata, Pursli ! fl. 2. 

 p. 574, not of Nutt. 



y. divisions of the radical and lower leaves i)innatifid. — R. digitata, Mill. 



