88 | Rhodora [May 
Cyp. pt. 1, no. 91 (1834), in part. Æ. angustifolium, Torr., Ann. Lyc. 
Nat. Hist. N. Y. iii. 339 (1836), in part, not Roth. Æ. angustifolium, 
B ?brevifolium, Torr. l. c. 340 (1836), in part. Æ. gracile, B. pauciner- 
vium, Engelm., Am. Jour. Sci. xlvi. 103 (1844); Gray, Man. ed. 2, 
502 (1856). Æ. gracile, Gray, Man. 529 (1848); Britton & Brown, 
Ill. Fl. i. 273 (1896), in part, including fig. 642. E. paucinervium, A. 
A. Eaton, Bull. Torr. Cl. xxv. 341 (1898); Britton, Man. 182 (1901). 
— Swamps and bogs, Newfoundland to Ontario, south to New Jer- 
sey and Illinois. Fruiting July and August. 
* * Leaves flat, at least below the middle: involucre (except in dwarf vari- 
ety of E. polystachion) of 2 or more bracts. 
+ Scales of the spikelet with only 1 prominent rib: stamens 3. 
++ Midrib of the scale prominent only below the membranous tip: leaves 
triangular-channeled above the middle; the upper sheaths 
dark-girdled at summit. 
E. POLYSTACHION, L. Culms 2-6 dm. high, slender, obtusely an- 
gled: basal leaves several, elongate, usually conduplicate, especially 
above the middle; cauline leaves few, remote, stiff, flat only toward 
the base, 1.5-15 cm. long, 1.5-4 mm. broad, the margins scabrous: 
involucral bracts 2 or 3, dark-colored at least at base, the longest 2—9 
cm. long: spikelets 2 to 10, the central subsessile, the others on 
divergent or drooping stout mostly glabrous peduncles (0.5—7 cm. 
long), in anthesis ovoid, 1-2 cm. long, in fruit 2.5-4.5 cm. long: 
scales lead-color to castaneous, ovate to lanceolate, acutish, 4-10 
mm. long, the slender midrib disappearing below the pale membran- 
ous tip: anthers linear, 2.5-5 mm. long: achenes oblong-obovoid, 
compressed-trigonous, 2.7—3.5 mm. long: bristles bright white. — Sp. 
52 (1753); Schk., Handb. i. 28,t. 8 (1791); Curt., Fl. Lond. iv. t. 9 
(1821); Hook. [ folystachyon], Fl. Bor.-Am. ii. 231 (1839); Reich. 
[polystachyum], Ic. Fl. Germ. viii. 35, t. 291 (1846); Britton & Brown 
[Polystachyon], Ill. Fl. i. 273 (1896), in part ; Britton, Man. 182 (1901), 
in part. Linagrostis polystachia, Scop., Fl. Carn. ed. 2, i. 48 (1772). 
Eriophorum angustifolium, Roth., Tent. i. 24 (1788), ii. 63 (1789), 
and Neue Beitr. 94 (1802) ; Engl. Bot. viii. t. 564 (1799); Hornem., 
Fl. Dan. ix. t. 1442 (1818); Beck, Bot. 427 (1833); Koch, Syn. 745 
(1837); Hook, Fl. Bor-Am. ii. 231 (1839), in part; Thomé, FI. 
Deutschl. i. t. 102 B, C. (1886); Palla, Bot. Zeit liv. ab. 1, 148, 151 
(1896). Æ. angustifolium, B. laxum, Mert. & Koch, Deutschl. Fl. i. 
456 (1823). ? E. strictum, R. Br. in Richards., App. Franklin Jour. 
