474 PEOCEEDINGS OF THE AMERICAN ACADEMY. 



July 12, 1893 (no. 165), Foxcroft, June 25, 1894, Dover, June 28, 

 1894, Orono, July 6, 1891,— all coll. M. L. Fernald ; Sangerville, 

 July 17, 1896 (67. B. Fernald, no. 176): New Hampshire, between 

 Marshfield and Fabyans, July 6, 1878, Bethlehem, June 20, 1887 {E. $ 

 C. E. Faxon); Wbitefield, July 3, 1896 (W. Deane) : Vermont, St. 

 Johnsbury, June 21, 1901 ( T. E. Hazen, no. 206). Resembling north- 

 western forms of the polymorphous /estiva group, but not satisfactorily 

 referable to any of them. 



2. Leaves 0.5 to 2 mm. wide: culms 3 to 7 dm. high : spikelets remote or at 

 least distinct in a moniliform or linear-cylindric spike. 



11. C. straminea, Willd. — Figs. 28, 29. — Culms very slender, 

 smooth except at summit : spikelets 3 to 8, yellow-brown, or rarely green, 

 ovoid or subglobose, 4 to 8 mm. long, usually forming ftexuons spikes : 

 perigynia with ascending inconspicuous tips ; the inner faces S- to 5-nerved 

 or nerveless. — Willd. in Schkuhr, Riedgr. 49, t. G, fig. 34; Bailey, 

 Mem. Torr. CI. i. 21, & in Gray, Man. ed. 6, 621 ; Britton, 1. c. fig. 

 868 ; Howe, I. c. 44. C. straminea, var. minor, Dewey, Am. Jour. 

 Sci. xi. 318, t. N, fig. 45 ; Torr. 1. c. 395. C. festucacea, var. tenera, 

 Carey, 1. c. 545. C. straminea, var. tenera, Boott, 1. c. 120, t. 384 

 (except perigynia from Olney) ; Gray, Man. ed. 5, 580 ; Macoun, 1. c. 

 132. — Meadows, or occasionally on dry banks or in open woods, New 

 England to British Columbia, Kentucky and Arkansas. June- 



All£f. 



Var. echinodes. — Fig. 30. — Tips of the slightly longer perigynia 

 divergent and conspicuous. — Ontario, Wyoming, June 24, 1901 (J. 

 Macoun, Herb. Geol. Surv. Can., no. 26,624) : Michigan, Detroit, 

 July 20, 1867 (H. P. Sartwell), June 26, 1870, and June 22, 1873 

 (Wm. Boott): Iowa, Ames, 1872, Spirit Lake, June 21, 1881 (J. C. 

 Arthur). Superficially resembling C. tribuloides, var. reducta. 



++ ++ Mature perigynia more than 4 mm. long (very rarely shorter in exceptional 

 individuals of C. tenera, var. invisu, and C. festucacea, var. breviov). 



= Perigynia elongate-ovate, about half as broad as long (suborbicular in 



var. Richii). 



12. C. tenera, Dewey. — Figs. 31, 32. — Culms slender and flexuous, 

 sharply angled, smooth except at summit, 3 to 9 dm. high: leaves 

 shorter than or rarely exceeding the culms, very ascending, 1 to 2.5 mm. 

 broad: spike slender, moniliform (or on late culms more or less con- 

 gested), of 3 to 9 broadly ovoid broionish spikelets 8 to 12 mm. long, with 



