208 coMPOSiTiE. (composite family.) 



22. inriJliA, L. Elecampane. 



Outer scales of the involucre sometimes leaf-like. Achenia terete or 4-sided. 

 Pappus simple, of capillary bristles. Anthers with 2 tails- at their base. Oth- 

 erwise much as in the last genus. (The ancient Latin name.) 



1. I. HELiNiDM, L. (Common Elecampane.) Stout (3°-5° high); 

 leaves large, woolly beneath; those from the thiclj root ovate, petioled, the 

 others partly clasping ; rays very many, narrow. IJ. — Road-sides, escaped from 

 cultivation. Aug. — Heads very large. Root mucilaginous. (Adv. from Eu.) 



23. P litre HE A, Cass. Maksh Flbabane. 



Heads many-flowered ; the flowers all tubular ; the central perfect, but sterile, 

 few, with a 5-cleft corolla ; all the others with a thread-shaped truncate corolla, 

 pistillate and fertile. Involucre imbricated. Anthers with tails. Achenia 

 grooved. Pappus capillary, in a single row. — Herbs, somewhat glandular, 

 emitting a strong and disagreeable or camphoric odor, the heads in close com- 

 pound corymbs. Elowers purplish. (Dedicated to the Abbe Pluche.) 



1. P. camphorata, DC. (Salt-maksh Fleabane.) Minutdy vis- 

 cid, pale (l°-2° high) ; leaves, scarcely petioled, oblong-ovate or lanceolate, thick- 

 ish, obscurely veiny, serrate ; corymb flat; involucre viscid-downy. ® (ConJ"- 

 za camphorata, Bigel. C. Maryliindica, Pursh.) — Salt marshes, Massachusetts 

 to Virginia and southward. Aug. 



2. P. fcetida, DC. Almost smooth (2° -4° high); leaves distinctly petioled, 

 veiny, oval-lanceolate, pointed at both ends, serrate ; corymbs panicled ; invo- 

 lucre smooth. IJ. — River-banks, Ohio to Illinois, and southward. Aug. 



24. BACCHARIS, L. Groundsel-Tree. 



Heads many-flowered ; the flowers all tubular, dioecious, viz. the pistillate and 

 staminate flowers in separate heads borne by difiercnt plants. Involucre imbri- 

 cated. Corolla of the pistillate flowers very slender and thread-like; of the 

 staminate, larger and 5-lobed. Anthers tailless. Achenia ribbed. Pappus of 

 slender capillary bristles, in the sterile plant scanty and tortuous ; in the fertile 

 plant very long and copious. — Shrabs, commonly smooth and resinous or glu- 

 tinous. Flowers whitish or yellow. (The name of some shrub anciently dedi- 

 cated to Bacchus.) 



1. B. tialimifolia, L. (Sea Groundsel-Tree.) Smooth and some- 

 what scurfy ; branches angled ; leaves obovate and wedge-form, coarsely 

 toothed, or the upper entire ; heads scattered or in leafy panicles ; scales of the 

 involucre acutish. — Searbeach, Connecticut to Virginia, and southward. Sept. - 

 Oct. — Shrub 6° - 12° high ; the fertile plant conspicuous in autumn by its very 

 long and white pappus. 



2. B. glomernliflora, Pers. Leaves spatulate-oblong ; heads larger, 

 sessile in the axils or in clusters ; scales of the bell-shaped involucre broader 

 and very obtuse : otherwise like the last. — Pine barrens, Virginia near the 

 uuast, and southwaid. 



