THE PLANTS OF THE PRIBILOF ISLANDS. 575 



171. Elymus mollis, Trin. 



Very common ou both islands. 



172. Elymus villosissimus, Scribn. 



Culms stout, 3 dm. high, from creeping root-stocks; leaves of sterile shoots narrovr, 

 as long as the culm; leaves of the culm comj^aratively short (G to 13 cm.) and broad 

 (G to 10 mm.). S])ikes ovate-oblong, 5 to G cm. long, Spikelets densely villous, 15 to 

 L'O mm. long, 2 to 3 flowered. Emj)ty glumes narrowly lanceolate, acuminate, 3-nerved, 

 about as long as the florets, densely silky villous on the back. Third glume. 12 to 15 

 mm. high, 9-nerved, ovate-lanceolate, acute. Palea about as long as the glume, 

 2-toothed, hairy on the sides and back, ciliate on the keels, rachilla densely pubescent. 



Common in depressions on grassy ujilands. Growing with Valeriana capitata, 

 Viola langsdorfii, RuMos stellatiis, and such plants. 



173. Equisetum arvense, L. 

 Common on both islands. 



174. Equisetum scirpoides, Michx. 

 Common on both islands. 



175. Equisetum variegatum, Schleich. 



Abundant at the north end of St. Paul Island. 



176. Botrychium lunaria, Swartz. 



Rare among sand dunes on St. Paul Island. 



177. Phegopteris polypodioides, F6e. 



Collected on St. George Island by Messrs. True and Prentiss, and on St. Paul by 

 Mr. Palmer. 



178. Asplenium. iilix-foemina, Bernh. 



Not rare in the interior of St. Paul Island. 



179. Aspidium. spinulosum, Swartz, var. dilatatum, Hook. 



Common on both islands. 



180. Aspidium filix-mas, Swartz. 



Bare on St. George Island. 



181. Cystopteris fragilis, Bernli. 

 Common on both islands. 



Two ferns, Folypodium vulgare, L., and Aspidium lonchitis, Swartz, supposed to 

 have been collected on the Pribilof Islands by Mr. C. H. Townsend, are included in 

 Dr. Merriam's list, but as the specimens are not in the United States National Her- 

 barium and no one else has collected these species on the Pribilof Islands, they have 

 been excluded from this list. They are both common at Unalaska. 



182. Lycopodium selago, L. 

 Common on both islands. 



183. Lycopodium alpinum, L. 



Eocky uplands on St. Paul Island. 



184. Lycopodium annotinum, L., var. pungens, Sprang. 

 Barren uplands on St. Paul Island. 



