
Graminaceae 55 
ERAGROSTIS MEADOW-GRASS 
Annual (ours) or perennial. Leaves flat, usually numerous, pilose at the ligule. 
Spikelets 3—50-flowered, compressed, awnless, perfect except the upper flower; panicle 
usually large, spreading or contracted: rachilla usually persistent with the palets. Glumes 
ovate, acute or somewhat obtuse, smooth or slightly hairy on the keel. Lemma mem- 
branous, keeled, 3-veined. Palet arched, slightly shorter than the lemma. © Grain en- 
closed, free, oblong or globose. (Gk. er—spring, agrostis—a grass. ) 
A. Plant prostrate, creeping; spikelets 10—40-flowered; glumes 0.5—1 mm. long. 
BW Bo CE. repens. ) E. hypnoides B. S. P. (Creeping Meadow-grass) 
AA. Plants not prostrate, often caespitose. 
B. Spikelets 4—50-flowered; glumes 1.51.8 mm. long. 
C. Spikelets 2—3 mm. wide, 6—50-flowered. E. 
E. major Host (Stink-grass) 
CC. Spikelets 1—2 mm. wide, 4—20-flowered. E. 
ba E. pilosa Beauv. (Slender Meadow-grass) 
BB. Spikelets 3——-12-flowered; glumes 0.50.7 mm. long. E. 
E. lutescens Scribn. 
EATONIA 
Perennial, slender. Leaf-blades usually flat. Spikelets 2—3-flowered: panicle 
narrow; rachilla jointed below the glumes ard between the flowers; lower flowers and the 
glumes falling together. Glumes subequal, exceeding the upper but not the lower flowers, 
subcoriaceous in fruit; the first narrow, I-veined; the second wider, usually obovate, 
3-veined. Lemma chartaceous, obscurely 3-veined, awnless (ours) or awned below the 
summit; awn usually straight or divergent. Palet hyaline, narrowed toward the base. 
Stamens 3. Grain enclosed, not. adherent. (Honor of Amos Eaton, an American 
botanist. ) 
A. Upper glume subcucullate-cbtuse, obovate, much wider than the lemma; spikelets 
Z.5——3 mm. long. E. E. obtusata Gray (Early Bunch-grass) 
AA. Upper glume acute, oblanceolate, as wide or slightly wider than the lemma; spike- 
lets 3—3.5 mm. long. E. E. pennsylvanica Gray 
KOELERIA 
Annual or perennial (ours), tufted. Leaf-blades flat or almost setaceous. Spike- 
lets 2—7-flowered, rarely |-flowered, flat, with short pedicel, numerous; panicle dense, 
spike-like, cylindric or interrupted; rachilla glabrous, jointed between the flowers, naked 
beyond the upper flower. Glumes acute to acuminate or shortly awn-pointed, unequal, 
scarious-margined. [emma similar to the glumes, more scarious, 3—5-veined, obtuse to 
mucronate-pointed. Stamens 3. Grain enclosed, not adherent. (Honor of G. L. Koeler, 
a German botanist.) W.E. K. cristata Pers. (June-grass) 
CATABROSA 
Perennial. Leaves flat, soft. Spikelets usually 2-flowered; panicle open; rachilla 
smooth. Glumes membranous, unequal, very obtuse, purplish (ours). Lemma mem- 
branous, obtuse or barely 3-toothed, exceeding the glumes. Stamens 3. Grain oblong- 
obovoid. Aquatic. (Gk. katabrosis—an eating; glumes and lemmas have margins rough 
as if gnawed.) E. C. aquatica Beauv. (Water Whorl-grass) 
