172 



Gramineae 



lA. Spikelets less than 2 mm. long; florets 0.7-0.8 mm. long; rachilla jointed, deciduous; anthers 1/6-1/4 as long as the lemma; culms 



strict; panicles narrow and elongate, 10-60 cm. long 1. E. japonica 



IB. Spikelets more than 2 mm. long; florets 1 mm. long or more; rachilla rather persistent. 

 2A. Spikelets, pedicels, sheaths and underside of leaf -blades sometimes, at least in part, with glandular depressions. 

 3A. Annuals; anthers less than 1 mm. long; lemmas rather obtuse. 



4A. Spikelets about 2.5 mm. wide; lemmas and glumes with few glands on the keel 2. E. cilianensis 



4B. Spikelets 1.5-2 ram. wide; lemmas and glumes with obscure glands or glandless 3. E. poaeoides 



3B. Perennial; anthers about 1 mm. long; spikelets without glands 4. E. ferruginea 



2B. Spikelets and other parts not glandular. 

 5A. Annuals; spikelets less than 1.5 mm. wide. 



6A. Mouth of leaf-sheaths and axils of panicles with tufts of few long hairs 5. E. pilosa 



6B. Leaf-sheaths, axils of panicles and other parts without long hairs 6. E. multicauUs 



5B. Perennials; spikelets 1.5-2 mm. wide, 5-20 mm. long. 



7A. Spikelets dull green to brownish, not purplish, lateral ones on short to rather long, ascending pedicels 7. E. bttlbillijera 



7B. Spikelets dull grayish purple, lateral ones on short appressed pedicels 8. E. aquatica 



1. Eragrostis japonica (Thunb.) Trin. Poa japonica 4. Eragrostis ferruginea (Thunb.) Beauv. Poa fer- 

 Thunb.; E. tenella sensu auct. Japon., non Beauv.; E. aurea ruginea Thunb.; P. barbata Thunb.; E. orientalis Trin.; E. 



Stcud.; E. interrupta var. tenuissima sensu Matsutn. & Hayata, pogonia Steud.; E. thunbergii Koidz., non Franch., 1892 



non Stapf Kogome-kaze-kusa. Annual; culms erect, Kaze-kusa. Tufted perennial; culms 30-80 cm. long; leaf- 

 branched at base, 50-120 cm. long; leaf-blades 10-20 cm. long, blades rather firm, 30-40 cm. long, 2-6 mm. wide, with loosely 

 2-5 mm. wide, glabrous; panicles straight, 20-60 cm. long, involute margins, long white hairs on upper side near base, 

 sometimes shorter, narrow, erect, the branches single, nu- and a ring of short hairs around the mouth outside; panicles 

 merous, 3-6 cm. long, slender, branching from base; spikelets narrowly ovate, 20-40 cm. long, the branches rather numerous, 

 rather densely arranged, ovate or broadly so, 1-1.5 mm. long, spreading, scabrous, glabrous, with a sessile, yellowish gland 

 1-1.2 mm. wide, rather flat, 3- to 5-flowered, pale green and on pedicels above the middle; spikelets lanceolate to narrowly 

 slightly red-tinged; glumes 1-nerved, obtuse, about 0.5 mm. oblong, flat, 6-10 mm. long, acute, 5- to 10-flowered, dull 

 long; lemmas elliptic, very obtuse, about 0.7 mm. long; palea purplish, rarely pale green; glumes narrowly lanceolate, acute, 

 as long as the lemma, obtuse, the keels scaberulous; caryopsis 1-nerved, the first 1-2 mm., the second 2-2.5 mm. long; 



ellipsoidal, nearly terete, smooth, about 0.3 mm. long. lemmas membranous, lustrous, narrowly ovate, 2.5-3 mm. 



Aug.-Sept. Honshu, Shikoku, Kyushu. s. Korea, China, long, rather acute, slightly shorter than the palea; anthers 



Ryukyus, and Formosa. 0.8-1.2 mm. long; caryopsis slighdy compressed laterally, el- 



2. Eragrostis cilianensis (All.) Lutati. Poa cilianensis lipsoidal, about 1 mm. long. Aug.-Oct. Waste grounds and 



All.; Briza eragrostis L.; Poa megastachya Koeler; E. major along roadsides; Honshu, Shikoku, Kyushu; common. 



Host; E. megastachya (Koeler) Link Suzumegaya. Korea, Manchuria, China, and the Himalayas. 



Tufted annual; culms 20-60 cm. long, usually ascending at 5. Eragrostis pilosa (L.) Beauv. Poa pilosa L.; P. ver- 



base, with a ring of glands below each node; leaf-blades flat or ticillata Cav.; E. verticillata (Cav.) Beauv.; E. filijormis Link 



loosely involute, 10-20 cm. long, 2-6 mm. wide, green, with O-niwa-hokori. Annual; culms erect from ascending 



indistinct glands beneath, on the margin, and on the back of base, tufted, slender, 30-70 cm. long; leaf-blades 10-20 cm. 



the sheath, long-hairy at the mouth; panicles 5-20 cm. long, long, 2-4 mm. wide with loosely involute margins; sheath gla- 



the branches single, spreading, with few long hairs on the brous, with long hairs at the mouth; panicles 10-25 cm. long, 



axils; pedicels with a prominent gland; spikelets 5-15 mm. narrowly ovate, the branches single or subverticillate and rather 



long, 2.5-3 mm. wide, 10- to 30-flowered, pale lead-green; many, spreading, with long hairs in axils; spikelets lanceolate, 



glumes about 2 mm. long; lemmas ovate, rather obtuse, 2-2.5 rather flat, 3-5 mm. long, 0.7-1 mm. wide, 5- to 10-flowered, 



mm. long, smooth; palea about % as long as the lemma; lead-green, often tinged with reddish purple; glumes broadly 



caryopsis broadly ovate, 0.6 mm. long. Aug.-Oct. Waste lanceolate, 1-nerved, rather obtuse, the first 0.5-0.7 mm., the 



grounds and along roadsides; Honshu, Shikoku, Kyushu; second about 1.5 mm. long; lemmas ovate, rather acute, 



rather common. Widespread in warm-temperate and tropi- 3-nerved, about 1.5 mm. long, deciduous with the palea; 



cal regions. anthers about 0.25 mm. long; caryopsis 0.6 mm. long, smooth. 



3. Eragrostis poaeoides Beauv. ex Roem. & Schult. Aug.-Oct. Honshu, Shikoku, Kyushu; very common in 



Poa eragrostis L.; E. eragrostis (L.) Beauv.; E. minor Host lowlands. Widespread in warm-temperate and tropical re- 



Ko-suzuMEGAYA. Smooth, rather mfted annual; culms gions. 



rather slender, 10-40 cm. long, often with a ring of glands 6. Eragrostis multicaulis Steud. Glyceria atroides 



below each node; leaf-blades 3-10 cm. long, 2-5 mm. wide, Steud.; E. pilosa var. nana Miq.; E. pilosa var. imberbis 



often sparsely pilose; panicles ovate, 5-20 cm. long, the Franch.; E. pilosa var. condensata Hack.; E. damiensiana (E. 



branches spreading; pedicels with a nodelike sessile gland on Bonn.) E. Bonn, ex Thell.; E. peregrina Wieg.; E. niwa- 



upper half; spikelets 3-8 mm. long, 1.2-1.7 mm. wide, pale hokori Honda ^Niwa-hokori. Allied to the preceding 



green to lead-green, 5- to 12-flowered; glumes acute; lemmas but smaller; culms 7-30(-50) cm. long; leaf-blades and sheaths 



ovate, rather obtuse, smooth, 1.7-2 mm. long; caryopsis el- glabrous, smooth; panicles 6-10 cm. long, without long hairs 



lipsoidal, slighdy laterally compressed. Aug.-Oct. Waste in the axils; spikelets ovate to oblong, rather dense, 4- to 



grounds and along roadsides; Honshu, Shikoku, Kyushu; 8-flowered, 2-3.5 mm. long, 1-1.5 mm. wide; stamens 2 or 3; 



rather common. ^Widespread in warm-temperate and tropi- anthers elliptic, about 0.25 mm. long. ^Aug.-Oct. Waste 



cal regions. grounds and cultivated fields; Hokkaido, Honshu, Shikoku, 



