162 BOTANY. 



description of Mr. Watson. — Plate IV. Figure 6. A branch, natural size 

 7. A disk-flower. 8. Chaff of disk-flower. 9. Ray-flower. 10. Section 

 through receptacle. All except the branch enlarged 10-20 diameters. 



Helianthus petiolaeis, Nutt. — Tall, erect, hispid; leaves scabrous 

 (lower sometimes opposite, upper alternate), ovate or ovate-lanceolate, 

 irregularly serrate-acuminate ; petioles long (but variable in length) ; 

 peduncles terminal ; heads large ; involucral scales lanceolate or broadly 

 lanceolate, acute; disk-corolla hairy at base; achenia villous; pappus of 

 "two chaffy awns"; rays large, over an inch long. — Southern Arizona, 

 Nevada, and Colorado. 



Helianthus annuus, L. (Helianthus lenticularis, Dough, see Gray, 

 Fl. Cal. 1, p. 353; also if. lenticularis, Dougl. vol. v, King's Report, and 

 Preliminary Report of Mr. Watson in Wheeler's Survey, Washington, 

 1874.) — Utah and Colorado. 



Helianthus Nuttallii, T. & G. — Nevada and San Luis Valley, Colo- 

 rado, with broader leaves (548). 



Helianthus giganteus, L., var. Utahensis, Eaton — Utah. 



Helianthella uniflora, T. & G.— South Park, Colorado (546). 



Actinomeris* Wrightii, Gray (PI. Fendl. p. 85). — Erect, somewhat 

 branching ; stems canescently hispid ; leaves sessile or slightly decurrent, 

 lower opposite, upper alternate, oblong or lance-ovate, irregularly and 

 strongly serrate, thick, scabrous, and distinctly veined, especially beneath; 

 heads on naked peduncles (6-12' long), medium-sized ; scales of the invo- 

 lucre in 2-4 series, with a short stout pubescence, outer ones shorter, 

 oblong and obtuse, inner lanceolate and acute ; rays short, entire or 

 slightly toothed (or sometimes none). Achenia of the disk cuneate-oblong, 

 with a distinct wing extending half-way down the achenium on either side, 



* Actinomeris, Nutt. — Heads heterogamous, radiate ; flowers of the ray neutral aud iu a single 

 series ; disk-flowers hermaphrodite, fertile ; beads sometimes, by the deficiency of the rays, homogainons. 

 Involucre hemispherical or campauulate; bracts 2-3-seried, unequal, short or the outer ones elongated 

 and foliaceous. Receptacle convex or at length conical, covered with chaff, which embraces tb,; disk- 

 flowers. Ray-corollas ligulate, spreading, entire or 2-3-tootbed ; disk-flowers regular, with a short tube; 

 limb elongated-cylindrical, 5-cleft at top. Anthers entire at base. Branches of the style iu the disk- 

 flowers terminated by acute appendages. Achenia laterally compressed, with margins attenuated and 

 distinctly winged. Pappus usually of two persistent awns.— Scabrous herbs. Leaves opposite or 

 alternate, petioled, sessile, or decurrent. Heads middle-sized, solitary, and with long peduncles or 

 corymbose-paniculate. — Bbnth. & Hook. 



