62 TRIANDTtIA D1GYNIA 



j" j* Panicle Contracted. 



38. CALAMAGROSTIS. Roth. Mitt. Gen. 70. 

 [Greek. Kalatuos.u Reed, and slgrostis ; from its affinity to both.] 



Spikelets 1-flowered. Glumes 2, nearly equal, acute, or acuminate. 

 /'alex 2, mostly shorter than the glumes, surrounded with hairs at 

 base ; lower one mucronate, mostly awned below the tip ; the upper 

 one often with a stipitate pencil-form pappus at base. 



1 . 0. canadensis, Beauv. Panicle oblong, loose ; glumes very acute, 

 sinoothish ; the lower palea awned on the back. Torr. St/nop. incif. 

 (fide Gray), Spec i m. Gray, Gram % 1. no. 18. Not of NuttalL 

 (*'. mexicana. Nutt. Gen. 1. p. 46. Bech f Bot. p. 401. 

 ('. cinnoides. Bart. Phil. I. p. 45. Not of Florul. Cestr. 

 Arundo Canadensis. J\I.r. Jim. I. p. 73. Pursh f Am. I. p. 86. Torr. 

 Ff. 1. p. 93. Bigel. Host. p. 38. Eat. Man. p. 31. 

 \. cinnoides. MuhL Catal. p. 13. Ejnsd. Grain, p. 187. 

 ,7/.vo, A. agrostoides. Pursh, Atn. 1. p. 86. 



( ! AXAIHAN GALAMAG UOSTIS. 



Rod perennial. Culm 3 to -1 feet higfy glabrous. Leaves lancc-lincar, striate or 

 norvedj somewhat scabrous; sheaths nerved, glabrous, lower ones retrorsely pu 

 bescent ; ligtdt elongated, lacerate. Panicle erect, much divided) rather loose; 

 branches capillary, aggregated in 5's orG's. Glumes longer than the palea, acute 

 or slightly acuminate, smouthish, scabrous on the keel. Palea unequal ; the low- 

 < r one with a slender awn, halfway down the back; the upper one sometimes with 

 .» stipitate pappus at base; hairs at the base of the paleae copious, as long or rather 

 longer than the paleae. Seed pubescent {MuhL), 



/fab. Swampy meadows : Londongrove : rare. FL Aug. Fr. September. 



Obs, This species was found in Londongrove township, by my amiable and 

 venerable friend, the late Mr. John JACKSON,—one of the earliest and most sue 

 cesafol cultivators of Botany in Chester County. 



Z. C. coaiictata, Torr Panielc contraeted, linear-oblong, some- 

 what dense and spike-form ; plumes roughish-pubeseont, acuminate, 

 keeled ; the lower palea awned a little below the summit ; the Upper 

 one with a stipitate pappus at base. Torr, Synop. ined, (fide Gray) K 

 Specim. Gray, Gram, 1. no, 19. 

 C. canadensis. Nutt. Gen. 1. p. 46. 



C cinnoides. Florul. Cestr. p. 10. Not of MuhL nor Bart. Phil. 

 Agrostis glauca. MuhL Catal. p. 10. Ejusd. Gram. p. 76. 

 Arundo coarctata. Torr. FL 1. p. 94. Biff el. Bost. p. 39. Als*. 

 Eat. Man. p. 31. 



Coarctate, ob Condensed Calamagrostis. 



. Whole plant glaucous. Root perennial. Culm erect, 2 to 4 feet high. Leates 

 Ttnear-lanccoiatc, nerved, somewhat pilose and scabrous, nerves and keel white j 

 sheaths striate, sometimes pilose; ligule oblong, obtuse. Panicle terminal, stiffly 

 *rect, densely contracted; branches short, aggregated. Glumes nearly equal, 

 lanceolate, with a subulate acuminatum, margins often purple ; the lower one 1 

 aerred, the upper 3-nerved. Palea nearly equal, scabrous, something shorter 

 ?ltan the glumes ; lower one 5-nerved, bifid at apex, with a short, straight awn, a 



