GRAMINE^. (grass FAMILY.) 565 



Spikeleta in close dusters at the end of the short branches, 2 - 4-flowered. 

 Glumes and flowers lanceolate. 



34. PESTUCA, L. Fesche-Geabs. 



Grasses with flat or setaceous leaves, and panicled 3 -many-flowered mostly 

 awned epikelets. Rachis jointed as in Glyceria. Glumes unequal, mostly keeled. 

 Paleee nearly coriaceous ; the lower one naked, rounded on the back, 3 - 5-nerved, 

 acute or bristle-awned ; the upper commonly adhering at maturity to the enclosed 

 ijrain. Stamens 1 -3. 



* Flowers awned: panicle contracted: annuals. 



1. P. MyUTUS, L. Culms erect, very slender, concealed in the sheaths of 

 tue bristle-like leaves; panicle elongated, linear, 1-sided, partly included in the 

 sheath of the uppermost leaf, the scattered branches appressed ; spikelets com- 

 pressed, 6-flowered ; awn 3-4 times the length of the subulate sparsely hairy 

 palea. Stamen I . — Dry sandy soil, Florida to North Carolina. March and 

 April. — Culms 6'- 12' high. Panicle pale, 4'-6' long. 



2. P. tenella, WiUd. Culms (2'- 12' high) erect or ascending; leaves 

 narrowly linear or filiform ; panicle long-peduncled, simple, spiked, or the 

 branches slightly spreading, mostly purple ; spikelets crowded, compressed, 

 oblong, 8 - 1 2-flowered ; awn not longer than the subulate hispid palea. — Dry 

 sandy soil, Florida, and northward. Feb. -April. 



3. P. duriuscula, L. Culms erect, 1°- lj° high ; leaves filiform ; panicle 

 simple, 1-sided, mostly bending, spi-eading ; spikelets oblong, about 6-flowered , 

 awn shorter than the smooth lanceolate palea. — Around dwellings, Florida, and 

 northward. Introduced. April - May. 



4. P. parviflora. Ell. " Panicle equal, slender, appressed ; spikelets 

 terete, subulate, 5-flowered, awned; calyx (glumes) unawned." Ell. — Near 

 Orangeburg, South Carolina, April. IJ. ? — Culms 12'- 18' high. Awn as 

 long as the palea. ( * ) 



* * Flowers awnless : panicle spreading : perennials. 



5. P. elatior, L. Culms l°-2° high; leaves linear, smooth; panicle long, 

 narrow, erect, the erect branches bearing the loosely 5 - 10-flowered spikelets 

 throughout ; palea oblong-lanceolate, barely pointed. — North Carolina, and 

 northward. Introduced. 



6. P. nutans, Willd. Culms 2° - 4° high, and, like the broadly linear 

 leaves, rough, or the latter hairy ; panicle 1-sided, simple, erect or bending, the 

 branches mostly by pairs, remote, bearing few ovate 5 - 6-flowered spikelets near 

 their summits, at length reflexed ; glumes rough on the back, acute ; lower palea 

 ovate, barely pointed. — Rich woods and banks, Florida, and northward. Aug. 



7. P. grandiflora, Lam. " Panicle simple, erect ; spikelets very few, 

 generally 7-fiowered ; flowers acute, distant." — Carolina, Frazer. ( « ) 



8. P. unioloides, Willd. Panicle contracted ; spikelets cornpressed, 8-flow- 

 ered, awnless ; sheaths of the leaves bearded at the summit. — Carolina, Willd. 

 — Panicle nodding, expanding. Spikes oblong-lanceolate. Root fibrons. (*) 



48 



