504 



APPENDIX. 



[Vol. III. 



[Vol. i: p. 185.] 2b. Sieglingia elongata (Buckley) Nash. Long-panicled 



Sieglingia. (Fig. 422b.) 



Uralepis elongata Buckley, Proc. Phila. Acad. Sci. 



1862: 89. 1863. 

 Tricuspis trinerviglumis Munro; A. Gray in Proc. 



Phila. Acad. Nat. Sci. 1862: 333. Name only. 



1863. 



Culms i-3 tall, tufted, erect, rough, the ster- 

 ile shoots about %. as long as the culms. Sheaths 

 rough, longer than the internodes, a ring of 

 hairs at the apex, the lower sheaths usually 

 sparingly papillose-pilose; ligule a ring of hairs; 

 leaves rough, usually involute when dry, 3 / -io / 

 long, i // -2 // wide; panicle narrow, 5 / -io / long, 

 y 2 ' wide, its branches erect, \y 2 ' or less long, 

 usually exceeding the rachis-internodes; spike- 

 lets 10-12-flowered, 4) // -6 // long, the empty 

 scales scabrous, hispidulous on the midnerve, 

 the first i-nerved, the second 3-nerved; flow- 

 ering scales about 3" long, obtuse at the scabrous 

 apex, 3-nerved, the lateral nerves vanishing at 

 or below the apex, the midnerve usually excur- 

 rent in a short point, all the vervs pilose below 

 the middle. 

 Prairies, Kansas to Arizona and Texas. June-Aug. 



[Vol. i: p. 185.] 2C. Sieglingia pilosa (Buck- 

 ley) Nash. Sharp-scaled Sieglingia. (Fig. 422c. ) 



Uralepis pilosa Buckley, Proc. Phila. Acad. Nat. Sci. 1862: 



94. 1863. 

 Tricuspis acuminata Munro; A. Gray in Proc. Phila. Acad. 



Nat. Sci. 1862: 335. Name only. 1863. 



Culms tufted,2^ / -i2 / tall,smooth and glabrous, the ster- 

 ile shoots 4/ tall or less. Sheaths smooth, a tuft of hairs on 

 each side at the apex, much shorter than the internodes; 

 ligule a ring of short hairs; leaves strict or curved, thick, 

 linear, obtuse, 1 -nerved, the margins white, serrulate, \y 2 ' 

 long or less, less than i // wide, folded, at least when dry, 

 pubescent with long hairs, especially beneath; panicle al- 

 most racemose, long-exserted, >^ / -i^ / long; spikelets 

 3-10, crowded, 8-12-flowered; empty scales acuminate, 

 i-nerved; flowering scales ^''-^A" long, acuminate, 

 3-nerved, the midnerve generally excurrent in a short 

 point, all the nerves (the lateral at the top and bottom, the 

 midnerve below the middle), the callus, and the base pilose. 



Dry soil, Kansas to Colorado, Texas and New Mexico. April- Sept. 



[Vol. I: p. 208.] 21a. Poa arachnifera 

 Torr. Texas Blue-grass. (Fig. 479a.) 



Poa arachnifera Torr. Marcy's Exped. 301. 1853. 



Culms tufted, i-3 tall, smooth and glabrous, from 

 running rootstocks; sterile shoots from one-half as long 

 as the culms to equalling them. Sheaths longer than 

 the internodes, smooth or roughish, hyaline on the 

 margins; ligule a short membranous ring; leaves linear, 

 erect, usually folded when dry, smooth beneath, rough 

 above, iX /_ 9 / long. i^ //- 3 // broad, abruptly acute; 

 panicle dense and contracted, sometimes interrupted 

 below, 3 / -6 / ^ / long, J^'-i,^' broad, its branches as- 

 cending or erect; spikelets numerous, 4-7-flowered, 

 the scales acuminate, the empty ones hispidulous on 

 the midnerve; flowering scales 2 // -2>^ // long, often 

 pointed, pubescent at the base with copious long cob- 

 ivebby hairs, ^-nerved, the midnerve and lateral nerves 

 pilose belovv the middle. 



Prairies, Kansas to New Mexico, south to Louisiana 

 and Texas. Also introduced in Florida. April-May. 



