58 



POACEAE 



14* C. elongata (Kearney) Rydb. Tufted perennial; stem 7-12 dm. high; 

 leaf-blades 1-3 dm. long, usually flat, 3-8 mm. wide, scabrous; panicle 1-2 dm. 

 long, narrow but scarcely spike-like; empty glumes 3-4 mm. long, acute, very 

 scabrous; lemma somewhat shorter, scabrous; awn attached below the middle. 

 C.hyperborea elongata Kearney. Wet meadows: Ont.— Pa.— Colo.— Calif.— 

 B.C. Plain — Mont. Jl-Au. 



15. C. lucida Scribn. Perennial, with a slender rootstock; stem 2.5-4 dm. 

 high, slender with few marcescent sheaths at the base; leaf-blades 5-13 cm. long, 

 2-3 mm. wide, strongly involute, slightly scabrous on the margins and nerves; 

 panicle 4.5-7 cm. long, ovoid to lanceolate, strongly flexuose; empty glumes 

 about 3 mm. long, short-acuminate, strongly keeled, minutely hispiduloas on 

 the keel; lemma slightly shorter; awn attached near the middle. C. laxiflora 

 Kearney. Meadows: Wyo. Au. 



16. C. micrantha Kearney. Perennial, with a slender, creeping rootstock; 

 stems 4-6 dm high, slender; leaf-blades 5-20 cm. long, 1-1.5 mm. wide, more or 

 less mvolute, fihform; panicle 5-8 dm. long, densely-flowered, purple or pale; 

 empty glumes 2 mm. long, scabrous; lemma slightly shorter; awn attached at or 

 below the middle. Wet places: Sask.— Colo. Plain—Mont. Jl-Au. 



u- i"^' 1^" j^^S}®*^** (Ehrh.) Gaertn. Perennial, with a rootstock; stem 4-6 dm. 

 high, slender; leaves narrow, mvolute, soft, 5-15 cm. long; panicle contracted, 



O— lU cm. lone-: hrannhps mnefhr oT-ont • omTAf^r rrl, .,>>,.„ .,u,.,.i. a i j.. .ii.. 



acute; lemma about one-fourth shorter, obtuse; awn attached near the middle. 



C. slricta Trin. Wet places: Greenl.— Me.— Wis.— Colo.— Ore.— Alaska; Eu. 

 Plain— Subalp . Jl-S. 



• ?■ o ■ 1 ^i^^^P^J^^?" f- 9^'^y- Perennial, with a rootstock; stem usually 

 simple, 8-12 dm. high; leaf-blades 2-3 dm. long, 4 mm. wide or less, scabrous; 

 panicle 1.5-2 dm. long, usually nodding at the summit; empty glumes 4-4.5 mm. 

 long, very scabrous throughout, gradually acute; lemma scabrous, about as 

 long, acutish; awn inserted below the middle, about equalling the lemma. Wet 

 places: N.Y.-N.J.-S.D.-Colo.-Ida.-Wash.-B.C. Plain-^Suhmont. Jl- 



.\.}^i ^: fj^®"<^^^f Scribn Cespitose perennial, with numerous marcescent 

 sheaths at the base; stem 3-6 dm. high, scabrous above; leaf-blades 1-3 dm. long. 



lllr-U L 1 ^' ^P^^^-like; empty glumes 3-4 mm. long, very scabrous; lemma 

 nearly as long acute, scabrous; awn attached below the middle. C. hyperborea 



32. CALAMOViLFA Hack. Reed-grass, Sand-geass. 



Infllri^f ''''"'''^' ^f^ horizontal rootstocks and elongated narrow leaf-blades. 

 artiJulntS ."hn^'^r^^- ^P^^^*^'*^ flattened, 1-flowerea, crowded, the rachiUa 

 ?hiZl 2 nrtn^"! "" ^^F^l ^^^"^I^ ^"'^ ^^'^ prolonged beyond the flower. Empty 

 liT ^ .-^ZTf' P^^^tent rigid, chartaceous, awnless, keeled, 1-nerved; lemma 

 flower sT.mJn ^Ti^^ he base, enclosing a 2-keeled palet and a perfect 

 llower. btamens 3. Styles distinct; stigmas plumose. 



stem fi^oo^Hm^W J* l^?'"'^ ^fu^- 7^^^'^'' "^'^^ » ^^^^' «calv rootstock; 

 So^o^ wTnJ?f^ '^"''^■' ri*"")^.' ^"i' gl'-^hrous; leaf-blades 2-3 dm. long, stiff 

 ES the fi^tTl^/Ar^'n^ ^"^ ^"?- °"S' P^^«' ^^"o^; empty glumes 6-8 mm! 

 Smus c^ll.w ifof ^^^"^ *^'*^ 'rr^: ^,«™^^ ^^"^t as long as the second glume, 

 S Hook W ' ^«P/^"«Ahal^ f Jong as the lemma Calamagrostislongi- 

 Joha^ Hook. Sandy soil: Ont.-Ind.-Colo.-Ida.-Sask. Plain-Suhmonl. 



33. DESCHAMPSIA Beauv. Hair-grass. 



SnikSpt«''9''fl^ ""■ ^T'lt^' l".^0'-escence a terminal contracted or open panicle, 

 lonid be?;n^^^^^^^ '^'^^"^ articulated above the empty glumes aSd pro- 



longed bej ond the flowers. Empty glumes 2, persistent, keeled, acute, mem- 



