AND GENERA OP PLANTS. 353 



achenium subquadrangular or triangular, grooved ; pappus acute, one or two 

 of the segments carried out into awns. Espeletia amplexicaulis ; Nutt. in 

 Journ. Acad. Nat. Sci. Philad., Vol. VII., p. 38. 



Hab. In the Rocky Mountains. Flowering in June. Since publishing an account of this plant 

 in the seventh volume of the Journal of the Academy of Natural Sciences in Philadelphia, I have, 

 myself, met witli it in the Rocky Mountains, towards the sources of the Platte, from which speci- 

 mens I find that, though difl'ering some in habit, it belongs to the genus Wyethia. Stem some- 

 times two or more feet high, robust, and very smooth even to the margin of the leaf; the lower, 

 or radical leaves, at length coriaceous, attain a foot in length, are attenuated below, and, though 

 often entire, are sometimes serrulate; lower stem leaves sessile, the upper semiamplexicaule ; 

 flowers in a sort of short, approximating raceme; sepals very broad; rays ten to fifteen; achenia 

 and palea smooth. Stigmas slender, hirsute externally. 



§. I. ALAR90NIA. Pappus without awns. 



Wyethia Helenioides. Alar^onia HeIe?iioides; Decand., Vol. V., p. 537. Col- 

 lected in Upper California, by Douglas. Nearly allied to W. Californica, but evi- 

 dently a much larger plant. Obs. — The leaves of all the species are alternate. 



HELIOPSIS. {Persoon.) 



Capitulum many-flowered, heterogamous ; rays ligulate, feminine, in one series; 

 florets of the disk hermaphrodite, tubular, five-toothed. Stigmas slender, 

 filiform, pubescent at the summit, and terminating in a smooth, acute cone. 

 Involucrum somewhat biserial, shorter than the disk; sepals foliaceous at 

 the summit, cartilaginous, closely imbricated and coalescent below. Recep- 

 tacle conic, palea membranaceous, embracing, much shorter than the florets. 

 Achenium quadrangular, smooth, without pappus, but with a raised border, 

 and a small, epigynous disk. — Tall perennial herbs of North. America, with 

 ovate, opposite, petiolate, dentate leaves. Capituli solitary, pedunculate; 

 flowers yellow, with elongated rays. 



Heliopsis scabra. 



Hab. Arkansa; common. With the stem sometimes nearly smooth. 



Heliopsis * gracilis; smooth, leaves oblong-ovate, at either end acuminate, in- 

 cisely serrate; peduncles very long and slender; involucrum subsquarrose; 

 sepals lanceolate, pubescent on the margin. 

 VII. — 4 o 



