Berlandiera. COMPOSITiE. 2&3 



vided terminal lobe. Scapes, or peduncles, slender, 6-8 inches long. Head 

 as large as in B. tomentosa. 



75. ENGELMANNIA. Torr. S^- Gray, mss., hi Nutt. trans. Amer. phil. 

 soc. (n. ser.) 7. p. 343. 



Heads many-flowered; the ray-flowers equal in number to the inner 

 scales of the involucre (8-10), and situated in their axils, ligulate, pistiUate ; 

 those of the disk tubular, sterile. Scales of the involucre imbricated in about 

 3 series, coriaceo-chartaceous, broadly oval or obovate, appressed, the exte- 

 rior shortest ; all abruptly narrowed into a foliaceous lanceolate or linear 

 spreading appendage, the exterior exceeding the scale ilself in length. Re- 

 ceptacle flat ; the chalT persistent, chartaceous, with foliaceous and hairy 

 tips, partly involute and enclosing the sterile flowers ; the outer series lance- 

 olate, acute, two firmly adherent to the base of each inner involucral scale ; 

 the others very narrowly linear, rather obtuse. Corolla of the ray with an 

 oblong exserted sessile ligule ; of the disk dilated upwards, 5-toothed, the 

 teeth somewhat hairy. Style in the sterile flowers undivided, hispid. Ache- 

 nia of the ray equal in size to the concave inner involucral scales to which 

 they are applied, oval-obovate, obcompressed, convex and carinate external- 

 ly, flat or concave and one-ridged on the inside, scabrous-pubescent, not 

 winged or toothed, crowned with two small scarious lanceolate concave marce- 

 scent squamellae, which are more or less united at the base, hispid and fringed ; 

 those of the disk filiform, abortive, with a minute coroniform pappus. — A pe- 

 rennial branching rough and hirsute herb, with branching stems, corymbose- 

 paniculate at the summit, and bearing several rather small heads on slender 

 peduncles. Leaves alternate, strigose, oblong or ovate-lanceolate, irregu- 

 larly pinnatifid, with the segments lanceolate or linear (the lower longest 

 and divaricate), sessile ; the radical petioled and bipinnatifid. Rays yellow, 

 tardily deciduous, pubescent externally. 



E. pinnatifida {Torr. & Gray, 1. c.)— Silphium, n. sp. {Nutt.) Torr. in 

 ann. lye. New York, 2. ^?. 215. 



On the Canadian, Dr. James ! Red River, Arkansas, Nuttall ! Br. Lea- 

 venworth! Tcxns, Drummond .' — Plant ]-3 feet high. Leaves 2-5 inches 

 long. Heads about as large as in Polymnia Canadensis : the involucre sub- 

 globose. The base of the achenia coheres with the base of the involucral 

 and the two adjacent chaffy scales, but at length it separates witliout tear- 

 ing away the margin : the exterior coat (calyx-tube) is separable. — This 

 genus, intermediate between Silphium and Parthenium, is dedicated to 

 our esteemed correspondent. Dr. George Engelmann, of St. Louis, Mis- 

 souri, who has for several years assiduously studied the plants of Missouri, 

 Arkansas, &c., and made valuable contributions to many European collec- 

 tions, as well as to this work. 



Div. 4. Parthenie^, DC. — Fertile and sterile flowers in the same 

 heads ; the former (several) ligulate, the rays persistent or marcescent ; the 

 latter central, tubular. Fertile achenia obcompressed, not corticate or winged, 

 usually with a callous margin. Pappus none, or 2-squamellate. Anthers 

 scarcely united. 



