134 POACEAE 
5-nerved, obtuse, awnless, slightly scarious 
at the tip.  Resembling Festuca. — One 
species, native of Eu. 
1. S. rigida rs Griseb. Stems p Or 
T 10-20 em. tal, glabrous or 
inutely Pee ere leaf-blades flat, 1-2 
mm. wide: panicles narrow, condensed, 5-10 
mm ng, lemmas about 2.5 long. [Di iplachne rigida Munro]— 
(PRICKLY FESCUE. N ‘places, E EF] with ballast, aa Fla. 
and Mobile, Ala.; also S Mis 
95. BROMUS L. Low or rather tall annuals or perennials, with closed 
sheaths, flat blades and open or contracted panicles of large spikelets. 
lets several- to many-flowered, the rachilla disarticulating above the glumes 
and between the florets; glumes unequal, acute, the first 1- to 3-nerved, the 
second usually 3- to 5-nerved; lemmas convex on the din or keeled, 5- to 
perate regions nudi ord CHEATS. pne 
oca ODE te. Hie awn the lemmas distinetly po A LE dies lemmas acumi- 
e, : usually not more than 
: plan nt a I. UNIOLOIDES. 
Spire usually rus flattened: lemmas not Sonipressedeeodiod 
ant perennial. II. CILIATI. 
Planta dE 
Glu mo rather broad: lemmas broadly ellipti III. RACEMOSI. 
lumes narrow : lemmas narrow and sradualiy acuminate. IV. STERILES. 
I. UNIOLOIDES 
Plant rather stout, with tufted, usually decumbent stems, and 
pubescent leaf-sheaths. 1. B. unioloides. 
II. CILIATI 
Lemmas awnless or nearly so: panicle a suberect. 2. B. inermis. 
Lemmas long-awned : panicle-branches droop 
m S. 
Lemmas glabrou 3. B. laeviglumis. 
Lemmas pubescent or scabrous. 4. B. purgans 
III. RACEMOSI 
Leaf-sheaths glabrous. 5. B. secalinus. 
Leaf-sheaths pubescent. 6. B. commutatus. 
IV. EE 
Awns about 1.5 mm. long: lemmas pubes 7. B. tectorum. 
Awns 2-3 em. long: lemmas scabrous- phe NE 8. B. sterilis. 
1. B. unioloides H. B. K. Stem rather stout, 30—100 em. tall: paniele 15—50 
em. long, usually narrow, the branches appre essed, sometimes wider with spread- 
ing branches: spikelets 2-3.5 cm. long, 7—11-fülowered: first glume, 5-nerve 
—]0 mm. long, the second 7-nerved, 10-13 mm. pons lemmas subcoriaceous, 
