496 PROCEEDINGS OF THE AMERICAN ACADEMY. 



KnowUon, no. 231). A few specimens, cited by Dr. Britton under 

 E. 3ngelmanni, I have not seen, but some of them may well belong to 

 this variety, which is not recognized by him. 



Var. robusta. — Figs. 41 to 44. — Culms stout, about 3 dm. high : 

 the pale obloug-lanceolate heads becoming 2 cm. long, 3.5 or 4 mm. 

 broad : achenes distinctly larger than in the other forms, the thicker 

 tubercle less flattened, resembling that of E. obtusa, about one third as 

 high as the achene : bristles as in the species. — Missouui, Montier, 

 where it is said to be common, June 30, 1894 (B. F. Bush, no. 585) ; 

 vSpringfield, 1889 (/. W. Blankins/u'p) ; pond, Lawrence Co., June 19, 

 1890 (W. J. SpiUman) ; ravines in the Ozarks, Shannon Co., July 6, 1890 

 {B. F. Bush, no. 42) : essentially the same plant collected in western 

 South Dakota, Sept., 1892 (Z). Griffiths). 



++ -^ Heads ovate-lanceolate to oblong-lanceolate ; the acute or merely bluntish 

 scales more spreading. 



E. monticola. — Figs. 45 to 50. — Culms erect, 1 to 2.5 dm. high : 

 heads G to 9 mm. long, 2 to 3.5 mm. broad: scales chestnut-brown or 

 purplish with paler midribs and margins : achenes and tubercles resem- 

 bling those of E. Engehnanni ; the bristles equalling or slightly exceed- 

 ing the achene. — E. obtusa, Watson, Bot. Calif, ii. 222 (as to Plumas 

 County and Oregon plants), not Schultes. E. ovata, var. Engelmanni, 

 Britton, Jour. N. Y. Microsc. Soc. v. 103, in part (as to Lemmon speci- 

 men). — Plumas County, California, 187G (J/rs. Mary E. Pulsifer Ames) ; 

 northern Sierra Nevada of California (71 G. Lemmon, no. 485); Mult- 

 nomah County, Oregon {Howell, no. 408). Distinguished from the 

 more eastern and southern E. Engelmanni principally by its more ovoid 

 darker heads, and less appressed acutish scales, and like the latter species 

 losing the elongated setulose portions of its bristles in 



Var. leviseta. — Figs. 51, 52. — Bristles represented only by their 

 short naked bases. — In muddy j^lsices, valley of Ca-ur d'Alene River, 

 Kootenai County, Idaho, July 14, 1892 {Sandberg, MacDougal & Heller, 

 no. 649) ; and in a muddy place west of Killarney, Manitoba, Aug. 1, 

 1896 {John 3Iacoun, no. 16365). 



-f- H- Tubercle distinctly narrower than the achene. 



E. DiANDRA, Chas. Wright. — Figs. 53 to 58. — Culms slender, erect, 

 2 or 3 dm. high : heads ovoid, obtuse or acutish, 4 to 6.5 mm. long, 2 to 

 3.5 mm. wide : the small pale brown ovate or oblong-ovate scales acutish 

 or blunt, ascending but scarcely appressed: achenes small, broadly obovate 

 or inverted pyriform, capped by a compressed tubercle resembling that 



