472 PROCEEDINGS OF THE AMERICAN ACADEMY. 
* * Mature perigynia distinctly more than one-third (.44 to .75) as broad 
as long 
+ Perigynia one-fifth to one-third (.19 to .34) as thick as broad (rarely 
thicker in C. mirabilis). 
++ Mature perigynia 3 to 4 mm. long (very rarely longer in C. mirabilis and 
C’.. albolutescens). 
= Mature perigynia with roseate-spreading tips. 
8. C. cristata, Schweinitz. — Figs. 19 to 21.— Culms 1 m. or less 
high, harsh above : leaves soft and flat, 3 to 7 mm. broad, often equalling 
the culms, sheaths loose: spike usually dense, linear-cylindrie or oblong, 
of 6 to 15 globose closely flowered greenish or dull-brown spikelets 0.9 to 
1 cm. long. — Ann. Lye. N. Y. i. 66; Schwein. & Torr. Ann. Lye. 
N. Y. i. 315, t. 24, fig. 1; Dewey, 1. c. 44; Boott, l. c. 117, in part; 
Gray, Man. ed. 5, 579; Boeckeler, 1. c. 115; Howe, 1. c. 41. © 
lagopodioides, var. cristata, Carey, 1. c. 545. CO. straminea, var. cristata, 
Tuck. l. ¢. 9,18. ©. tribuloides, var. cristata, Bailey, Proc. Am. Acad. 
xxii. 148, in Gray, Man. ed. 6, 620, & Mem. Torr. Cl. i. 55 ; Macoun, 
l.c. 130. ©. eristatella, Britton, 1. c. 357, fig. 865.— Swales and wet 
woods, western New ENGLAND to PENNSYLVANIA, “ Viraeinta,” Mis- 
soURI, SASKATCHEWAN, and British CoLumpra. June—Aug. 
= = Mature perigynia with ascending tips. 
a. Plant stout and stiff: spikes stiff and upright ; the gray-green mostly approx 
imate spikelets with appressed firm perigynia. 
9. C. ALBoLUTESCENS, Schweinitz. — Figs. 22 to 24. — Culms 2 to 8 
dm. high: leaves erect, long-pointed, pale green, 2 to 5 mm. wide, 
shorter than the culms: spike linear-cylindric to subglobose, with sad 
without elongated bracts, of 3 to 30 (sometimes compound) conic-ovoid 
to subglobose spikelets 0.6 to 1 em. long: perigynia 2 to 3 mm. broad, 
rhombie-ovate to suborbicular, with a short deltoid firm greenish tip.— 
Ann. Lyc. N. Y. i. 66; Bailey, Bull. Torr. Cl. xx. 422 (incl. var- 
cumulata) ; Britton, 1. c. 359, fig. 873; Howe, 1. c. 43. C. foened, 
EIL Sk. ii. 533; Schwein. & Torr. 1. c. 815; Carey, 1. ¢. 546; Boott, 
1. c. 118 (excl. vars.), t. 375; not Willd. ©. straminea, var. foene 
Torr. Ann. Lyc. N. Y. iii. 395; Bailey, Proc. Am. Acad. xxii. 150, 
& in Gray, Man. ed. 6, 622; Macoun, 1. c. 132. ©. straminea, Va" 
intermedia, Gay, Ann. Sci. Nat. ser. 2, x. 364. (. Jeporina, Val 
bracteata, Liebmann, Mex. Halv. 76. . straminea, var. chlorostachys; 
Boeckeler, l. c. 118. ©. straminea, var. cumulata, Bailey, Mem. Tort. 
