462 



GRAMINEiE. 



Poa. 



nearly equal, lanceolate, acute ; the lower one with 5 strong nerves, slightly 5-toothed at the 

 apex : upper palea bifid at the tip. Stamens 3 : anthers pale yellow. Stigmas simply 

 plumose. 



Wet sandy places : Island of New- York, and western part of the State ; abundant on the 

 shores of Oneida lake. Fl. August- June. Perhaps this species should rather be referred to 

 Glyceria. 



*** Aeluropus, Trin. Spikelets in a contracted spikelike panicle. Lower palea coriaceous, many-nerved, not keeled. 



16. Poa Michauxii, Kunth. Spiked Salt-marsh Poa. 



Culms cespitose, erect ; leaves distichous, involute, spreading, rigid ; panicle contracted, 

 spiked; spikelets ovate or ovate-oblong, 5 - 10-flowerfd, smooth; flowers naked; lower 

 palea about 9-nerved. — Kunth, "Gram. 2. p. 533. t. 181," and enum. 1. p. 325, not of 

 Linn. Uniola spicata, Linn. sp. 1. p. 71 ; Ell. sk. 1. p. 166 ; Muhl. gram. p. 157 ; Torr. 

 fl. 1. p. 105 ; Bigel. fl. Bost. p. 32 ; Beck, hot. p. 413. U. dislichophylla, Ream. § Schult. 

 syst. 2. p. 596, not of Labill. Festuca distichophylla, Michx. fl. 1. p. 67 ; Pursh,fl. 1. p. 

 84. Briza spicata, Lam. enc. 1. p. 405. Brizopyrum spica'.um, Hook. Am. in Beech, 

 voy. p. 403 ? ; Hook. fl. Bor.-Am. 2. p. 254 ? 



Rhizoma creeping extensively and throwing up culms, many of which are sterile. Culms 

 12-18 inches high, terete, branching at the base. Leaves numerous, 2 - 6 inches long, 

 slightly glaucous ; the upper ones involute above the middle : sheaths closely embracing the 

 culm, smooth ; the upper ones hairy at the throat : ligule almost wanting. Panicle oblong, 

 spikelike, somewhat lobed. Spikelets mostly ovate-oblong, of a yellowish green color ; the 

 flowers all fertile. Glumes very unequal, lanceolate : lower one acute, and keeled ; the upper 

 rather obtuse. Stamens 3 : anthers purple. Style and stigmas elongated. Scales minute, 

 obovate. Caryopsis acuminate. 



Salt-marshes ; Long Island, Staten Island, along the East and Hudson rivers : common. 

 Fl. August - September. I have followed Kunth, in referring this grass to Poa. It has very 

 much the appearance of the European P. liltoralis. The plant of the Northwest coast differs 

 in some respects from ours. 



33 (a). TR1CUSPIS. Beauv. Agrost. p. 77. t. 15./. 10 ; Torr. fl.l.p.US. TRICUSPIS. 



So named from the three cuspidate points of the lower palea.] 

 Windsoria, Nutt.; TniDENS, Rairn. <$• Schult. 



Spikelets nearly terete, many -flowered. Glumes shorter than the flowers. Lower palea 

 tricuspidate by the projecting midrib and margins, with intermediate teeth ; the base and 

 sides villous : upper palea slightly bicuspidate. — Tall perennial grasses, with a large 

 spreading compound purple panicle. 



