3 



Type specimen No. 554, G. F. Breninger, Table Rock, Colorado, May 25, 1891. 

 Meadows. Altitude 2200 meters. 



Tall forms of this species approach Poa longepedvnoulata Scribn., but maybe 

 distinf,niished ])y the smaller size, stout rootstocks, very .short lower inter- 

 nodes, broader panicle, denser pubescence on the flowering glumes and more 

 rigid appearance. It also approaches foi-ms of Poa eatoni S. Wats., but dif- 

 fers in its shorter, broader panicle, shorter basal intemodes and fewer-flow- 

 ered spikelets. Like the following species it has usiially been refeiTed to 

 PoafendJeriana. Its range extends from Colorado to New Mexico and Ari- 

 zona. 



5. POA LONGILIGULA Scribn. & Williams, .sp. nov. 



A caespitose glaucous perennial. 4 or 5 dm. high, with rather harsh culms and 

 leaves abundantly produced from short rhizomes, persistent basal sheaths 

 and rather crowded panicles of large, shining, green or purplish spikelets. 

 Leaves of the sterile shoots erect or spreading, usually U to 2+ dm. long, 

 flat or conduplicate, with a conspicuous, decurrent ligule; cauline leaves 

 shorter, with longer ligules (5-7 mm.), the upper one sometimes reduced to 

 a mere mucro; leaves all rather rigid and miacronate-pointed. Panicle 

 ovate in outline, erect or rarely somewhat nodding, f to \i dm. long, lower 

 branches seldom exceeding 3^ cm. Spikelets compressed, ovate-lanceolate, 

 rather acute, 4-6-flowered, 6-10 mm. long. Empty glumes unequal, more 

 or less rough-hispid on the back ; the lower lanceolate, acute or acuminate, 

 1 -nerved, 44 mm. long, the upper much broader, 3-nerved, 5 mm. long. 

 Flowering glumes ovate-oblong, rather obtuse, 5-nerved, the intermediate 

 nerves inconspicuous , more or less scabrous above on the back, woolly pubes- 

 cent on the lower half of the keel and marginal nerves, with broad hyaline 

 margins, usually erose-dentate above, 4-5^ mm. long; palet much shorter 

 than the flowering glume, hyaline, with green, hispid -pubescent keels. 



Type specimen No. 5149, Marcus E. Jones, Silver Reef, Utah, May 3, 1894. 

 Altitude, 1,200 meters. 



This species has been referred to Poa fendleriana (Steud.) Vasey, from which it 

 is easily distinguished by its coarser growth, harsh stems and leaves, much 

 longer decurrent ligule, conspicuous on the leaves of both sterile shoots and 

 culms, larger spikelets and flowers, and denser pubescence of the flowering 

 glumes. 



Sderochloa calif arnica Mnnro, in Bentham's PI. Hartweg. (without description), 

 to which specimens of both this and the preceding species have been referred, . 

 is a very different plant and is also distinct from Poa fendleriana. It is 

 represented in the National Herbarium by Hartweg's No. 2035 and Brewer's 

 No. 1122, both from California, which agree exactly with the type of Poa 

 secunda Presl. in the herbarium of the Missouri Botanical Garden. 



Poa longiligula ranges from southwestern South Dakota to Southern Colorado, 

 Arizona, and Oregon. « 



0. POA PLANIFOLIA Scribn. & William.s, sp. nov. / ^- lA^j^i^ti pr^^ 



An erect, loosely spreading, glaucous perennial, about 6 dm. high, from short 

 rhizomes, with rather long, flat, abruptly pointed leaves and an open, sub- 

 pyramidal panifle 1-2 dm. long. Culm smooth, except just below the nodes, 

 where it is minutely roughened. Sheaths striate, somt-what keeled, more or 

 less roitgh on the keel, otherwise smooth ; leaves flat, glaucous, smooth below, 

 roughened above, especially on the margins, U to 2 dm. long; ligule obtuse 

 or truncate, about 2 mm. long. Panicle branches in 3's or 5's, scabrous, 

 spreading, the lower 5-10 cm. long, flower-bearing along the upper half. 



