GI? A MIX !:.<. (GRASS FAMILY.) 543 



from the base; panicle very simple and raceme-like, few-flowered; awn 2-3 

 times the length of the rather hairy whitish palece. (Urachne, Trin.) Hill-sides, 

 &c., in rich woods ; common northward. May. Leaves concave, keellcas, 

 rough-edged, pale underneath, lasting through the winter. Squamulae lanceo- 

 late, almost as long as the inner palea ! 



3. O. Canadensis, Torr. Culms slender (6'- 15' high), the lowest 

 sheaths leaf-bearing; leaves involute-thread-shaped; panicle contracted (l'-2' 

 long), the branches usually in pairs ; palcae pubescent, whitish ; awn short and 

 very deciduous, or wanting. (O. parviflora, Nutt. Stipa juncea, Michx. S. Can- 

 adensis, Poir. Milium p ungens, Torr. Urachne breAacaudata, Trin.} Rocky 

 hills an 1 dry plains, W. New England to Wisconsin, and northward ; rare. 

 May. Glumes l"-2'' long, sometimes purplish. Through the species, *or 

 perhaps variety, Urachne micrantha, Trin., this genus is strictly connected with 

 Stipa. 



14. STIPA, L. FEATHER-GRASS. 



Spikelets 1 -flowered, terete : the flower falling away at maturity, with the con- 

 spicuous obconical bearded and often sharp-poiuted stalk (callus), from the mem- 

 branaceous glumes. Lower palea coriaceous, cylindrical-involute, closely em- 

 bracing the smaller upper one and the cylindrical grain, having a long and 

 twisted or tortuous simple awn jointed with its apex (naked in our species). 

 Stamens mostly 3. Stigmas plumose. Perennials, with narrow involute leaves 

 and a loose panicle. (Name from OTimr), toiv, in allusion to the flaxen appear- 

 ance of the feathery awns of the original species.) 



* Callus or base of the floiver short and blunt ; glumes pointless. 



1. S. Richard SOilii, Link. Culm (1^- 2 high) and leaves slender ; 

 panicle loose (4' -5' long), with slender few-flowered branches; glumes nearly 

 equal, oblong, acutish (2^" long), about equalling the pubescent linear.oblong 

 lower palea, which hears a tortuous or geniculate awn 6" - 8" long. Pleasant 

 Mountain, near Sebago Lake, Maine, C. J. Sprague ; and northwestward. 

 (Flowers rather smaller than in Richardson's plant, as described by Trinius 

 and Ruprecht.) 



* * Callus or base of the flower pungently pointed : at maturity villous-bearded : louver 

 palea slender and minutely bearded at the tip : glumes taper-pointed. 



2. S. avenacea> L. (BLACK OAT-GRASS.) Culm slender (l-t* 

 high) ; leaves almost brist.^-form ; panicle open; palece blackish, near/y as long at 

 the almost equal glumes (about 4" long), the awri bent above, twisted below (2'- 

 3' long). Dry or sandy woods, S. New England to Wisconsin, and (chiefly) 

 southward. July. 



3. S. spa rtea, Trin., not of Hook. (PORCUPINE GRASS.) Culrn rather 

 stout (l-3 high) ; panicle contracted; palece linear, f'-l' long (including the 

 long callus), pubescent below, shorter than the lanceolate slende r subulate-pointed 

 greenish glumes ; the twisted strong awn 3^' -7' long, pubescent below, rough 

 above. (S. juncea, Fursh?) Plains and pr?iries, from Illinois ani N Mk-bi 

 gan northwestward 



