220 A TEXT-BOOK OF GRASSES 
c. Plants dioecious; sexes unlike, the pistillate 
lemmas long-awned, the staminate awn- 
less or nearly so; southwestern states 
(harrostape cal 8 a gee toe eee SCLEROPOGON. 
cc. Plants perfect; lemmas broad, 5-lobed; 
spikelets in racemes; annuals. Cali- 
HGSETIES, «5s ar SRS hea WS ee te ORCUTTIA. 
4A. Lemmas awnless or with 1 terminal awn, this 
sometimes from between 2 teeth (more or 
less 3-toothed in Tridens). 
B. Rachilla or lemma with hairs as long as the 
lemma (only the pistillate in Cortaderia) ; 
tall reeds with large terminal plume-like 
panicles. 
c. Plants dicecious, the staminate spikelets 
naked; bladesmarrow.< so i.6 <2). ae eee CoRTADERIA 
cc. Plants perfect; blades broad. (Par. 246). 
Dp. Lemmas hairy; rachilla naked.........ARUNDO - 
(Par. 247). 
pp. Lemmas naked; rachilla hairy......... PHRAGMITES. 
BB. Rachilla and lemmas naked or pubescent, not 
with long hairs. 
c. Plants dicecious. 
p. Plants low and creeping; spikelets 
obscure, scarcely differentiated from 
the short crowded rigid leaves; mud 
flats along coast. Florida and Cali- 
TOPRIM soe eid cs SAN Sins er ee ea MONANTHO- 
DD. Plants erect from creeping rhizomes; [CHLOE. 
inflorescence a narrow simple exserted 
pratieles sche 4 ec. li glearins wane ne eee DISTICHLIS 
cc. Plants not dicecious (except a few species (Par. 249). 
of Poa). 
p. Spikelets of 2 forms, sterile and fertile 
intermixed. 
E. Fertile spikelets 2- to 3-flowered; ster- 
ile spikelets with numerous awned 
glumes; our species perennial (C. 
cristatus L., crested dog’s-tail, occa- 
sionally sown in mixtures for 
THEAMOWE) stretch Wks hae ee Re CYNOSURUS. 
EE Fertile spikelets 1-flowered, long- 
awned; sterile spikelets with many 
obtuse glumes; annual (A. aurewm 
(L.) Kuntze, Lamarckia aurea 
Moench, golden top, occasionally 
cultivated for ornament, commonly 
introduced on the Pacific coast)... .ACHYRODES. 
DD. Spikelets all alike. 
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