486 SYNGENESIA [Senecioside* 



2; B. petiolata, J\*utf. Leaves lanceolate, acuminate, serrate, nar- 



rowed at base to a margined petiole ; heads mostly without rays, rather 



erect ; outer scries of the involucre bract-like, 3 times as long as the 



head. 



B. ccrnua. Floral Cestr. p. 92. JVM of L. nor ? others. 



Petiolate Bidens. 



Root annual? Stem 1 to 2 or 3 feet high, erect, striate, smooth, often purple, . 

 branched. Leaves 2 to 5 or 6 inches long, and 1 third of an inch to an inch or 

 inch and half wide, opposite, lanceolate, serrate, with a long entire acumnation, 

 smooth, somewhat scabrous on the margin, cuneately tapering at base to a narrow- 

 margined j^/iote half an inch to near 2 inches in length, the petioles sub-connate 

 at base. Heads of flowers middle-sized, rather erect; involucre double,— the 

 outer leaflets about 5, foliaceous, lance-oblong, rather obtuse, slightly mucronate, 

 smooth, subciliatc, 2, 3 or 4 times as long «e thn brad, the toner leuflots s:arcely 

 as long as the head, oblong-ovate, acute, membranaceous, striate, brown with a 

 scarious yellowish margin ; rays generally wanting ; florets of the disk greenish- 

 yellow. Akenes compressed, oblong- or obovate-cuneate, striate, retrorsel; hispid 

 on the margins ; papjms consisting of 3 or 4 rctrorsely hispid awns, the twomiddle 

 ones shorter, and of these the inner one often entirely wanting. Receptaclt chaffy, 

 the chaff lance-oblong, nearly as long as the florets. 



Hab. Low, swampy grounds; ditches, &c. frequent. Fl. Sept. Fr. Octa 



Obs. This was hastily and erroneously inserted in my Catalogue, as 13. cernaa. 

 In fact, I have never yet met with an American specimen which agreed exactly 

 with the B. cernua, of Europe. Mr. Nut tall, who examined our plant, calls it B. 

 petiolata; and I believe he has somewhere published it by that name. I must 

 confess, however, that with the exception of the "tomato" leaves, Mr. ElliotVs 

 description of B. connata comes very near it. 



3. B. fhondosa, L. Lower leaves quinate-pinnatc, upper ones 

 ternate, lanceolate, serrate ; heads without rays ; outer series of the 

 involucre fr ondo se, much longer than the head, the leaflets ciSate at 

 base. Beck, Hot. p. 207. 



Frondose, or Foliaceous Bidexs. Vulgo — Bur Marygold. 



Root annual. Stem 2 to 4 or 5 feet high, angular, striate, sprinkled whh a few 

 hairs, often dark purple, branched. Leaves opposite, pseudo-pinnate, the lower 

 ones quinate, the upper ones ternate ; the leaflets 2 to 4 or 5 inches long, aid half 

 an inch to an inch wide, lanceolate, acute, serrate, slightly ciliate, and pilose 

 beneath, abruptly narrowed at base to a short margined ciliate petiole,— \hc com* 

 mon petiole 1 to 3 inches long, striate, somewhat margined and pubcscem-ciliate. 

 HeaSs of flowers rather small, on long slender naked axillary branches, or 

 peduncles ; i?ivolucre double,— the outer leaflets 8 to 10 or 12, foliaceous, unequal, 

 lanceolate, acute, sparingly pilose, narrowed and conspicuously ciliate towards 

 the base, 2 or 3 to 5 or 6 limes as long as the head,— the inner leaflets scarcely as 

 long as the head, ovate-lanceolate, acute, striate, brown, with a scarious nargin; 

 rays none; florets of the disk yellowish. Akenes compressed, obovate-cuneate, 

 pubescent and ciliate with erect hairs; pappus consisting of 2 retrorsely hispid 

 awns longer than the florets. Receptacle chaffy, the chaff linear-lanceolaw, about 

 as long as the akenes. 



Bfcfc. Garden* i teacc»row*i fcc. common. FL August— Sept. Fr. Octotor* 



