LAMSON-SCRIBNER AND MERRILL— GRASSES OF ALASKA. 73 



17. Poa trinii sp. nov. 



Poa rigens Trin.; Griaeb. in Ledeb Fl. Ross. 4: 393. L853, as synonym, not Ilartni. 

 1820. 



A robust, erect, glabrous perennial about GO cm. high, with firm, rigid, mostly plane 

 leaves and ovate, very densely flowered panicles 8 to 10 cm. long, 2 to 4 cm. in diam- 

 eter; culms and sheaths glabrous, the latter shorter than the internodes, rather loose; 

 ligule a cartilaginous ring 1 to 2 mm, long; leaf blades 10 to 15 cm. long, 5 to 8 mm. 

 wide, erect or ascending, glabrous except on the scabrous margins; panicles very 

 densely flowered, the axis and branches glabrous, the latter appressed or ascending, 

 flower-bearing throughout, the lower ones 3 to 4 em. long; spikelets 6 to 7 mm. long, 3 

 or 4-flowered; glumes broadly lanceolate, abruptly acute, the first 4.5 mm. long, the 

 second 3-nerved, 5 to 5.5 mm. long; lemmas lanceolate, about 5.5 mm. long, 5-nerved, 

 abruptly acute, very scabrous throughout, with numerous basal hairs about 1 mm. 

 long, and also usually somewhat silky-hairy on the keel and marginal nerves below. 



Poa rigens was a herbarium name and was never published by Trinius, although 

 specimens were distributed under it. There is in the Gray Herbarium a specimen 

 bearing the following printed label: "Poa rigens Trin. Kamtsch.," and in writing: 

 "Comm. Acad. Petr. 1835," which is the type of our species, and which is doubtless 

 of the same collection that Grisebach observed in the herbarium of Ledebour and 

 which he reduced to Glyceria glumaris (Poa eminens Presl). Poa trinii is, however, 

 very distinct from that species, being readily recognized by its smaller spikelets, and 

 especially by its very densely flowered ovale panicles. 



Norton Sound, islands of the Bering Sea, and Shumagin Islands. 



Specimens examined: St. Michael Island, Turner 6, common on dry hillside; 

 Xagai Island, Harrington in 1871-72; without locality, Hall in 1873. 



18. Poa eminens Presl, Rel. Haenk. 1: 273. 1830. 



f'oa glumaris Trin. Mem. Acad. St. Petersb. VI. Math. Phys. Nat. 1: 371). 1830. 



Glyceria glumaris Griseb. in Ledeb. Fl. Ross. 4: 392. 1853. 



A stout, erect, glabrous, glaucous perennial 30 to 90 cm. high, from strong creeping 

 rootstocks, with thick, flat leaves 15 to 25 cm. long, 6 to 10 mm. wide and many-flow- 

 ered panicles 10 to 20 cm. long, the branches spreading or ascending, fasciculate, 

 glabrous, often 8 to 10 cm. long; spikelets 3 to 5-flowered, 8 to 12 mm. long, with 

 nearly equal glabrous glumes, the second 7 to 8 mm. long, somewhat exceeding the 

 first; lemmas strongly scabrous, 5 to 7 mm. long, pubescent on the keel and margins 

 below, not webbed. 



In damp soil and in sands along the coast from the Aleutian Islands to southeastern 

 Alaska, and southward to California; also on the northern Atlantic coast. 



Specimens examined: Turner 1206 in part; St. Paul Island, Macoun 1(5031 ; Nusha- 

 gak, Winneman in 1884. McKay in 1881; Popof Island, Saunders in 1899, Trelease 

 <£* Saunders 2919; Seldovia, Piper 4767; Shumagin Islands, Harrington in 1871-72, 

 Trelease & Saunders 2977; Cape Fox, Trelease <£- Saunders 2920; Homer, Evans 472, 

 Piper 4765; Kasilof, Evans 692; Kodiak, Piper 4766, 4768; between Cook Inlet and 

 Tanana River, Glenn in 1899; Virgin Ray, Coville & Kearney 121,0; Yakutat Ray, 

 Trelease & Saunders 2923, 2924; Unalaska, Coville & Kearney 1750, Harrington in 1871- 

 72; Tatitlak, Evans 273; without locality, Funston 137. 



Presl's name being the earliest available one for this species, it is here taken up, 

 as there is no doubt as to the identity of his species. Poa eminens is a most distinct 

 species, readily recognized by its coarse, rigid culms and leaves, and large panicles 

 and spikelets. 



19208—10 3 



