180 COMPOSITE. 



loose corymbose clusters. S. lanceolata, 0. minor Mich. Euthamia tenui- 

 folia Nutt. 



Sandy fields. N. Y. and Mass, to Flor. and Louis. Aug. Oct. 1\.Slem 

 slender, 12 18 inches high. Heads smaller and less crowded than in the pre- 

 ceding ; rays about 10 ; disk flowers 5 6. Slender-leaved Golden-rod. 



20. BACCHARIS. Linn. Baccharis. 



'From Bacchus, to whom the original plant was dedicated by the Greeks.) 

 Heads many-flowered, dioecious ; the flowers all similar and 

 tubular. Receptacle naked or somewhat chaffy. Involucre 

 somewhat hemispheric or oblong, imbricate, in several series. 

 STERILE FL. Corolla dilated, 5-cleft. Anthers exserted, un- 

 awned at base ; style more or less abortive. Pappus in a single 

 series, about as long as the involucre. FERTILE FL. Corolla 

 filiform and somewhat truncate. Anthers none. Style bifid, 

 exserted. Pappus in one or several series, usually much longer 

 than the involucre. 



J3. halimifolia Linn. : leaves obovate, incisely-toothed above, cuneate at 

 base and attenuated into a short petiole; upper lanceolate and nearly 

 entire ; heads of the sterile plant subglobose, solitary or aggregated ; of the 

 fertile ovoid-oblong, loosely panicled. 



Sandy beaches. N. Y. Conn, and N.J. S. to Flor. Sept., Oct. A shrub 

 6 12 feet high, covered with a whitish resinous powder or dust. Heads in the 

 sterile plant mostly clustered at the summit of the leafy branches ; in the fer- 

 tile, arranged in a large loose terminal panicle. Flowers white. 



Groundsel Tree. 



21. PLUCHEA. Cass. Marsh Fleabane. 

 (Named in honor of Noel Pluche, author of " Spectacle de la Nature," &c.) 



Heads many-flowered ; the outer flowers in many series, pis- 

 tillate, truncate or 2 3 -toothed ; the central ones perfect or 

 sterile, 5-toothed. Receptacle flat, naked or hirsute-fimbrillate. 

 Involucre in many series, imbricate. Anthers bicaudate. Ache- 

 nia cylindric, sulcate-angular. Pappus in one series, filiform, 

 roughish. 



1. P. camphor ata D.C.: minutely viscid-pubescent; leaves ovate or 

 ovate-lanceolate, sessile and slightly petioled, sprinkled with resinous dots, 

 repantly-toothed ; corymb fastigiate ; scales of the involucre viscid-pubes- 

 cent. ( Torr. & Gr.) P. camphorata and P. Marylandica D. C. Conyza 

 camphorata Big. Erigeron camphoratum Linn. 



Salt marshes. Mass, to Flor. Aug. Oct. 0. Steml 2 feet high, branched 

 at the summit. Leaves somewhat succulent. Heads in numerous crowded 

 corymbs, purple. When bruised this plant gives out a strong spicy, but some- 

 what disagreeable odor. Big. Seaside Marsh Fleabane. 



2. P. fastida D. C. : smoothish or minutely pubescent ; leaves oval-Ian- 



