Gramineae 



163 



glumes unequal, acute, scabrous on the keel, the upper nar- 

 rowly ovate; lemmas 2.5-3 mm. long. May-July. Shaded 



waste places and parks; Hokkaido, Honshu, Shikoku, Kyushu; 



common. Korea. Possibly a hybrid of P. acroleiica X P. 



annua. 



6. Poa tuberifera Faurie ex Hack. MuKAco-TsirauRi. 

 Weak perennial without stolons or distinct rhizomes; culms 

 somewhat tufted, 20-50 cm. long, slender, smooth, the basal 

 1 or 2 internodes short, bulbously thickened, globose to 

 ellipsoidal; leaf -blades flaccid, smooth, 5-15 cm. long, 2-4 mm. 

 wide; ligules truncate, 1-2 mm. long; sheaths weakly keeled, 

 the margins connate to the top; panicles very loose, 8-15 cm. 

 long, with rather few spikelets, the branches in pairs, spread- 

 ing, slender, slightly scabrous; spikelets pale green, long-pedi- 

 celled, 5-6 mm. long, 2- to 4-flowered, prominently flattened; 

 glumes unequal, acute, the upper broadly lanceolate, 3-4 mm. 

 long, 3-ner\'ed; lemmas 3.5-4.5 mm. long, acute, green, gla- 

 brous or short-pubescent on the sides at base, the midrib and 

 marginal nerves appressed-pubescent at base, the intermediate 



ner\'es very weak, the web wanting. May-June. Woods; 



Honshu, Shikoku, Kyushu; rare. 



7. Poa hakusanensis Hack. P. yezomontana Honda 



Hakusan-ichigo-tsunaci. Rhizomes short, with ascending 

 short innovations; culms 40-70 cm. long, terete, smooth; leaf- 

 blades flat, 15-20 cm. long, 3-6 mm. wide, short-acuminate, 

 soft, nearly smooth; sheaths without a keel, the lower terete 

 with fused margins; ligules about 1 mm. long, truncate; 

 panicles broadly ovate, open, diffuse, 8-15 cm. long, the 

 branches 2- to 4-nate, nearly smooth, spreading, spikelet-bear- 

 ing on the upper parts, the verticils naked at base; spikelets 5-7 

 mm. long, 2- or 3-flowered, glaucous-green; glumes broadly 

 lanceolate, acute, the lower 1- to 3-nerved, about 3.5 mm. long, 

 the upper 3-nerved, 4-5 mm. long, scabrous on the nerves; 

 lemmas narrowly ovate, rather acute, about 5 mm. long, gla- 

 brous on the sides, the midrib and marginal nerves short- 

 pubescent near base, the web scanty and short. July-Aug. 



High mountains; Hokkaido, Honshu (centr. distr.). 



8. Poa radula Fr. & Sav. P. sudetka sensu auct. Japon., 



non Haenke; P. ibut{iana Koidz. Ibuki-somosomo, Chi- 



SHiMA-soMosoMo. Rhizomes short; culms rather tufted or 

 solitary, 80-150 cm. long, retrorsely scabrous on the upper part 

 of the internodes and below the panicle; leaf-blades thin, flat, 

 green, 20-30 cm. long, 5-10 mm. wide, scabrous; sheaths con- 

 nate to above the middle, somewhat keeled on back, slighdy 

 retrorsely scabrous; ligules 1-3 mm. long; panicles large and 

 open, to 30 cm. long, loosely flowered, the branches sub- 

 verticillate, spreading, prominently scabrous; spikelets green, 

 4-7 mm. long, prominendy flattened, 4- to 8-flowered; glumes 

 scabrous, very acute, lanceolate, the lower 1-nerved, 2.5-3 mm. 

 long, the upper 3-nerved, 3-3.5 mm. long; lemmas broadly 

 lanceolate, keeled, 3.5-4.5 mm. long, acute, glabrous on the 

 sides, with glabrous, distinct intermediate nerves, the keel and 

 marginal nerves appressed-pubescent near base, the web short 



and scanty. June-Aug. Woods in mountains; Hokkaido, 



Honshu (as far west as Mount Ibuki in Omi Prov. in centr. 

 distr.). s. Kuriles, Kamchatka, Sakhalin, and Ussuri. 



9. Poa eminens Presl. P. glumaris Trin.; P. /{tirilensis 

 Hack.; P. glumaris var. kurilensis (Hack.) Kudo; P. trinii 



Scribn. & Merr. Oni-ichigo-tsunagi. Stout, glaucescent 



perennial with long creeping rhizomes; culms 4-5 mm. thick 

 above the base, 40-100 cm. long, erect, smooth, terete; leaf- 

 blades nearly flat, rather thick, 10-30 cm. long, 5-10 mm. 



wide, smooth, glabrous, very acute; sheaths terete; ligules 1-2 

 mm. long, truncate; panicles erect, 10-25 cm. long, 3-5 cm. 

 wide, narrowly oblong, densely spicate, the branches 3- to 

 5-nate, nearly smooth, rather thick; spikelets ovate, glaucous- 

 green, sometimes with a purple hue, 6-8 mm. long, 3- or 

 4-flowered; glumes lanceolate, 3-nerved, acute, 5-6 mm. long; 

 lemmas 5-nerved, 5-6 mm. long, glabrous on the sides, the keel 

 pubescent on lower half, the marginal nerves pubescent near 



base, the web scanty; anthers 2-2.5 mm. long. July-Aug. 



Sandy shores; Hokkaido; rare. Sakhalin, Kuriles, Ussuri, 



Kamchatka, and nw. N. America. 



10. Poa fauriei Hack. P. tateyamensis Honda Ainu- 



soMosoMo. Tufted perennial, with elongate innovadon- 

 shoots becoming decumbent and rooting, also with innova- 

 tions at the nodes; culms slender, soft, smooth, 20-60 cm. long, 

 with several nodes; leaf-blades flat, soft, thin, green, smooth, 

 4-10 cm. long, 2-3 mm. wide, acute; sheaths much shorter 

 than the internodes; ligules about 1 mm. long; panicles broadly 

 ovate, nodding, 2-8 cm. long, the branches geminate, smooth, 

 with 1 to 4 spikelets; spikelets 5-7 mm. long, 4- to 6-flowered, 

 pale green, very soft; glumes equal, broadly lanceolate, thin- 

 margined, smooth, 1- to 3-nerved, 3.5-4.5 mm. long; lemmas 

 oblong, 4-5 mm. long, 5 (-6) -nerved, rounded to obtuse, with 

 few irregular teeth at apex, short-pubescent near base and on 



nerves below, the web wanting or very scanty. Grassy 



mountain slopes; Hokkaido (w. distr.), Honshu (Japan Sea 

 side, as far west as Echizen Prov.) ; rare. 



11. Poa glauca Vahl. P. misera var. alpha Koidz.; P. 

 sphondylodes var. alpina (Koidz.) Honda; P. extremiorientalis 



Ohwi Takane-tachi-ichigo-tsunagi. Rhizomes short; 



culms somewhat tufted, erect, with 1 or 2 nodes toward base, 

 20-30 cm. long; leaf-blades glaucous-green, rather flat, 5-10 

 cm. long, 1.5-2.5 mm. wide, smooth; sheaths longer than die 

 internodes, sometimes tinged reddish purple; ligules truncate, 

 about 0.5 mm long; panicles erect, densely spicate, lanceo- 

 late, 3-7 cm. long, the branches short, scabrous, 3- to 5-nate, 

 widi few spikelets; spikelets short-pedicelled, lustrous, pale or 

 glaucous-green with a purple hue, 3-4 mm. long, 2- or 

 3-flowered; glumes lanceolate, very acute, 3-nerved, the lower 

 about 2.5 mm., the upper about 3 mm. long; lemmas 2.5-3 

 mm. long, narrowly ovate, 5-nerved, rather acute, usually 

 bronzed toward the margin, glabrous on the sides, the keel 

 short-pubescent on lower 2/3, the marginal nerves pubescent 

 on lower half, the intermediate nerves not distinct, the web 

 wanting or nearly so; anthers 1.2-1.5 mm. long. June- 

 Aug. Alpine regions; Honshu (centr. distr.) ; rare. Sakha- 

 lin, n. Korea, and generally in high mountains of the N. 

 Hemisphere. 



Var. Idtadakensis (Ohwi) Ohwi. P. \itadaliensis Ohwi 

 KiTADAKE-icHiGO-TsuNAGi. Culms 40-70 cm. long; pani- 

 cles 10-15 cm. long, with elongate branches to 8 cm. long, the 

 verticils widely naked at base; spikelets 5-6 mm. long; glumes 

 acuminate, 4-5 mm. long; lemmas 4—4.5 mm. long, acute to 



very acute; anthers 1.5-2 mm. long. July-Aug. Alpine 



regions; Honshu (Akaishi mountain range) ; rare. 



12. Poa hayachinensis Koidz. Nanbu-somosomo. 

 Rhizomes short with innovation-shoots; culms 30-50 cm. long, 

 smooth, ascending at base; leaf-blades rather flat, 7-15 cm. 

 long, 4-6 mm. wide, short-acuminate, smooth, rather thick 

 and soft, glaucous above; sheaths connate on the lower half, 

 smooth, terete; ligules truncate, 0.5-1 mm. long; panicles nod- 

 ding, ovate, 10-15 cm. long, open, die branches 2- or 3-nate, 



