Senecio. composite. 437 



Europe. Also Hudson's Bay, Newfoundland, and Labrador, {Hook.) June- 

 Oct. — A homely weed, a span to a foot high. — Groundsel. 



• ♦ Annual ; licads radiate. 



2. ,S. lohatus (Pers.) : glabrous (or slightly floccose when young) ; stem 

 striate ; leaves somewhat fleshy, lyrate-pinnatifid or pinnately divided ; the 

 lobes mostly distant and opposite, rounded, crenate-toothed or incised ; corymb 

 (usually compound) crowded, fastigiate ; involucre nearly ecalyculate ; rays 

 about 12 ; achenia minutely hispid on the 5 alternate (stronger) ribs. — 

 Pers. syn. 2. p. 436 ; Ell. ! sk. 2. p. 332. S. lyratus, Michx. ! fi. 2. p. 120, 

 not of Linn. f. ^r. S. glabellus. Pair. did. 7. p. 102. S. Carolinianus, 

 Spreng. syst. 3. p. 559. S. Mississippianus, DC. ! prodr. 6. p. 427. S. den- 

 siflorus, Martens, in hull. acad. Brux. 8. p. 67. S. Schweinilzianus, Null.! 

 in trans. Amer. phil. soc. {n. ser.) 7. p. 411. 



Damp soils, rice-fields, &c. North Carolina! to Florida! Missouri! Lou- 

 isiana! and Texas! common : flowering through the season. — Stem hollow. 

 Leaves extremely variable in the degree of incision, and in the number and 

 size of the segments; the uppermost leaves often auriculate-clasping and 

 laciniate-incised ; the lowest petioled. — Butter-weed. 



3. S. Coronopus (Nutt.) : glabrous, much branched; leaves all pinnatifid, 

 auriculate-clasping, with a wide rachis and a few acute segments, those of 

 the upper leaves denticulate ; branches fastigiate, bearing few heads on 

 elongated naked peduncles ; scales of the campanulate involucre (about 20) 

 smooth, carinate, with acute sphacelous tips ; rays about 15, oblong, elon- 

 gated ; achenia cylindric, 10-ribbed, the ribs strigose; pappus about the 

 length of the florets. — Nutt. ! in trans. Amer. phil. soc. I. c. p. 213. 



St. Barbara, California, Nuttall! — May. — Plant not glaucous. Rays 

 bright yellow. — Mr. Nuttall inquires whether it may not be a variety of S. 

 coronopifolius, Desf., introduced by accident ; and it does not differ in any 

 essential points from the description of that species. 



4. S. Californicus {DC.) : glabrous, erect; stem nearly simple, somewhat 

 angled, corymbose at the summit ; radical leaves oblong, tapering into a 

 petiole, entire; the cauline lanceolate, toothed, partly auriculate-clasping; 

 corymb simple, somewhat crowded; scales of the campanulate slightly caly- 

 culate involucre 20, acuminate; rays about 20, several-nerved; the disk- 

 flowers about 60; achenia velvety-villous [?]. DC! prodr. 6. p. 426. 



(3. laxior (DC! I.e.): corymb looser; rays 10-15; disk-flowers about 

 50; achenia more densely villous [?]. 



California, Douglas. — The so-called villosity of the achenia, in this spe- 

 cies, is probably produced by the emission of spiral threads, when moistened. 



5. S. ? flocciferus (DC.) : stems angled, glabrous, much branched from 

 the base ; leaves mostly radical, pinnately parted ; the ovate acutely toothed 

 lobes bearing here and there dense tufts of floccose hairs in their axils; cauline 

 leaves few, at the origin of the branches ; heads solitary terminating the 

 branchlets ; involucre glabrous, calyculate ; rays almost none, deformed, pis- 

 tillate, scarcely different from the disk-flowers; achenia glabrous. DC. 

 prodr. 6. p. 426 ; Hook. Sf Am. hot. Beechey, suppl. p. 360. 



California, Douglas. — " The flowers are reddish ; the ligulate florets ap- 

 pear to be in several rows, and gradually to pass into the tubular ones." 

 Hook. 8f Am. 



• * * Biennial : heads radiate, corymbose : involucre not calyculate. 



6. S. palustris (Hook.): stem erect, somewhat simple, villous; leaves 

 broadly lanceolate, dentate-sinuate [or laciniately subpinnatifid], acute, 



