176 DICOTYLEDONOUS PLANTS. 



ceous. Receptacle naked. Florets tubular, dioecious. Ste- 

 rile with the anthers exserted, unawned at base, pappus slight- 

 ly feathered. Fertile filiform, pappus capillary. 



Syngenesia. Superflua. 



B. halimi folia Linn. : leaves obovate and oval, incisely toothed near 

 the summit; panicle compound, leafy ; heads of flowers peduncled. 

 HAS. Sea coast. Md. to Geor. Sept., Oct. J?. A shrub 6 12 

 feet high, and with the leaves covered with a whitish powder or 

 dust, flower* in a large loose terminal panicle. Pappus of the 

 fertile florets hairy, twice as long as the corol. 



Ploughman's Sjnkenard. 



18. CONYZA. Linn. 



Involucre imbricate, the scales appressed. Receptacle nak- 

 ed. Marginal florets fertile, 3-cleft. Pappus simple, ca- 

 pillary. Acines hairy. Syngenesia. Superflua. 



C. carnphorata Pursh : herbaceous, slightly pubescent ; leaves on 

 petioles, ovate-lanceolate, very acute, denticulate ; corymbs terminal 

 and axillary, shorter than the leaves ; scales of the involucre acute, as 

 long as the florets. Erigeron camphoratum Linn. 



HAB. Salt marshes. Mass, to Geor. Aug., Sept. 2j. Stem 

 1 2 feet high, rather succulent Flowers in axillary and terminal 

 corymbs, purple. When bruised, this plant gives out a strong 

 picy but somewhat disagreeable odour. Big. Marsh Fleabane. 



19. INTJLA. Linn. 



Involucre squarroae or imbricate. Florets of the ray very 

 numerous, yellow. Anthers each with 2 bristles at the base. 

 Receptacle naked. Pappus simple. Nutt. 



Syngenesia. Superflua. 



I. helenium Linn. : leaves clasping, somewhat toothed, ovate, ru- 

 gose and tomentose beneath j scales of the involucre downy. 



HAB. Roadsides. N. S. July, Aug. U- Stem 3 4 feet high, 

 branching at the top. Leaves very large, those of the root petio- 

 led, of the stem clasping. Flowers large, solitary, terminal, 

 yellow. Elecampane. 



30. CHRYSOPSIS. Nutt. 



Involucre imbricate. Anthers naked at the base. Recep- 

 tacle naked. Pappus double ; the outer chaffy and minute ; 

 the inner hairy, scabrous and many rayed. Acines obovate, 

 villous. Rays of the corol mostly yellow. 



Syngenesia. Superflua. 



