wo 
29. Phalaris L. 
Tall perennials with broad flat blades and nerrow Spikelike panicles. 
Spikelets laterally compressed, disarticulating above the glumes with a single 
terminal perfect floret and ~s appressed rudimentary lemmas below it; glumes 
equal, acute, J-nerved, strongly keeled, the keel sometimes narrowly winged; 
lemmas shorter shan the glumes, indurate, sparsely pilose; palea indurate, as long 
as the lemma. 
1. P. arundinacea Le Reed Canary Grass. —— >Culms stmt, erect with 
rhizomes, as much as 180 cm. tall; sheaths scaberulous; ligules broad and 
prominent, 4-9 mme long; blades flat, smooth or scabrous, as much as 30 cm. 
long, 15 mm. wide; panicles narrow, interrupted, the branches appressed, 
densely flowered, floriferous from the base; glumes 4-5 mne long, scabrous; 
fertile lemmas 5-4 mm. long, shining, sparsely pilose, the rudimentary ones 
half as long, pilose. 
Wet meadows and lake shores, 
g®. Panicum L. 
Annuals or perennials with open panicles; spikelets articulate below 
the glumes, with one perfect terminal floret and a sterile one below it; 
glumes membranaceoussunequal, the first less than half the length of the 
spikelet, the second equaling the sterile lemma; sterile lemmas similar to the 
Slumes in texture, commonly inclosing a hyaline palea; fertile lemmas 
chartaceous~indurate, smooth and shining, the margins inrolled, inclosing 
a palea of similar texture. 
O Plants annual; basal blades similar to those of | CafHans~ 
4 the culin + 
© Plants perennial; basal blades different from those 
4 of the culm, forming a winter rosette 
2 Upper surface of the blades glabrous or nearly 
(so; culms sparsely pilose 2« P. occidentale 
a) 
4» Upper surface of ek blades papillose pilose 
G@ culms rathe ensely ee pilose de Pe pacificum 
nicletat, Leider db. 
Ler? « ilestern ass, Culms erect, branching 
at the base, 10-50 cm. tall; sheaths longer than the intern des, papillosa@> =| 
hispid; blades usually erect, flat, 3-10 om. long, 3-5 mn. wide, nispid on 
both surfaces; panicles half the length of the culms, diffuse, the slender 
branches divaricate; spikelet bearing toward the ends; spikelets 3 mm. long, 
acuminate; first glume pointed, aout two-fifths the length of the spikelet; 
second glume and sterile lemna exceeding the fruit, 7-9-nerved; fruit 1.8 mm. 
longs (P. barbipulvinatum Uashg),<7 
Meadows and waste vlaces. ™ oe 
C4 tte w4 270 PL eet ‘ 
wer y Shs Maries, 2700. ft., ipling and Offord 8050. —~ 
Po Aon ae 
— i) 
