Gramineae 



175 



1. Tripogon japonicus (Honda) Ohwi. T. longeari- 

 status Honda var. japonicus Honda Fukurodagaya. Rhi- 

 zomes short; culms 15-25 cm. long, densely tufted, slender, 

 smooth, with old sheaths bearing intravaginal innovations 

 from the base; leaf-blades narrowly linear or subulate, in- 

 volute or with involute margins, die radical to 20 cm. long, 

 with long white hairs near base on upper side; ligules very 

 short; spikes at length exserted, erect, 10-15 cm. long, nar- 

 row; spikelets in 2 rows on the axis, secund, sessile, ap- 

 pressed, linear-oblong, 6- to 8-flo\vered, 5-7 mm. long, pale 

 lead-green, lustrous; glumes lanceolate, 1-nerved, the first acute 

 to mucronate at apex, nearly 3 mm. long, the second gradually 

 narrowed to tip, ending in a short awn about 1 mm. long; 

 lemmas narrowly oblong, 2.5-3 mm. long, obtuse with 2 

 hyaline teeth at apex; awn 4-5 mm. long, geniculate; anthers 



1-1.5 mm. long. Honshu (Hitachi and Shimotsuke Prov.) ; 



very rare. 



2. Tripogon chinensis Hack. var. coreensis Hack. T. 

 coreensis (Hack.) Ohwi Nezumigaya. Densely tufted. 



strict perennial; culms 20-30 cm. long, with few nodes at 

 base, striate, very slender but rather stiff, glabrous, simple; 

 leaf-blades filiform, 3-5 cm. long, 0.5-0.7 mm. wide, scarcely 

 thicker than the culms, erect, tightly convolute to loosely in- 

 volute, smooth outside, long-pilose around the mouth inside 

 and often sparsely so or glabrous on margin; ligules very short, 

 hyaline, 0.5 mm. long; spikes solitary on the top of the culms, 

 7-10 cm. long, about 2 mm. across; rachis slender, smooth; 

 spikelets sessile, nearly cylindric, 3- or 4-flowered, 4-6 mm. 

 long, 1.2 mm. wide, lead-green; glumes linear-lanceolate, acu- 

 minate, scarious, scaberulous above; lemmas narrowly oblong, 

 about 3 mm. long, smooth or obsoletely punctate, shallowly 

 bifid, with 2 hyaline, semirounded erose tips, the lateral nerve 

 excurrent as a minute mucro, the midnerve excurrent as an 

 erect scaberulous dehcate awn 1-2 mm. long; callus with hairs 

 about 1/6-1/5 as long as the lemma; rachilla-joints slender, 



glabrous, about half as long as tlie lemma. Oct. Kyushu 



(Hirado Isl. in Hizen) ; very rare. Korea. 



61. CYNODON L. C. Rich. Gyogi-shiba Zoku 



Firm, low perennials with long stolons, short leaves, and digitate inflorescence; spikelets nearly sessile, in 2 rows on one side of 

 flattened simple branches of the inflorescence, strongly laterally flattened, 1-flowered, awnless, articulate below the floret; glumes 

 2, 1-nerved, folded, acute, shorter than the lemma, unequal or barely so, membranous; lemmas ovate, strongly folded, flattened, 

 3-nerved, chartaceous, smooth, pubescent on the keel; rachilla prolonged behind the floret as a bristle, glabrous; palea 2-keeled, 



lanceolate, as long as the lemma; stamens 3; ovary glabrous. Few species, widely distributed, chiefly in Africa and 



Australia. 



1. Cynodon dactylon (L.) Pers. Panicum dactylon L.; 



Capriola dactylon (L.) O. Kuntze Gyogi-shiba. Culms 



rather firm, 15-40 cm. long, from axils of long creeping, leafy 

 stolons; leaf-blades pale green, rather flat or with involute 

 margins, 5-8 cm. long, 1.5^ mm. wide, short-linear, sparsely 

 long-pilose especially near the very short ligule; inflorescence 

 digitate; spikes 3-7, ascending to spreading, 2.5-5 cm. long, 

 sessile; spikelets 2-3 mm. long, rather dense, appressed to the 

 axis, pale green, sometimes with a pale reddish hue; glumes 

 unequal, lanceolate, 1-nerved, acute, the first incurved and 

 appressed to the lemma, about 1.5 mm. long, the second 



ascending, about 2 mm. long, slightly shorter than the lemma; 

 lemmas ovate, folded, obtuse or mucronate, 2.5-3 mm. long, 

 the keel slightly curved, appressed-pubescent; anthers 1-1.5 



mm. long June-Aug. Sunny places; Hokkaido, Honshu, 



Kyushu, Shikoku; common. Widespread in all temperate 



and tropical regions. 



Var. nipponica Ohwi. O-gyogi-shiba. A robust phase 

 with spikes 5-10 cm. long; spikelets 3-3.5 mm. long. Hon- 

 shu and westward; connected by intermediates with the typi- 

 cal phase. 



62. CHLORIS Sw. O-hige-shiba Zoku 



Annuals or perennials; leaf-blades flat, sometimes folded; inflorescence digitate, the branches 2-8; spikelets sessile, rather 

 flattened, with 1 fertile floret and 1 to few sterile ones above, articulate below the fertile floret; glumes 2, narrow, acute, mem- 

 branous, folded, keeled; lemmas chartaceous, usually 3-nerved, broadly ovate, folded, pubescent on the keel and marginal 

 nerves, 2-toothed at apex, awned from between the teeth; sterile lemmas usually truncate at apex, often awned; callus short- 

 hairy; rachilla glabrous; palea slightly shorter tlian the lemma, 2-keeled; stamens 3; caryopsis glabrous, smooth, the hilum 

 minute. About 40 species, chiefly in the Tropics. 



1. Chloris virgata Sw. C. caudaca Trin. O-hice- 



SHiBA. Rather stout, firm annual; culms 30-50 cm. long; 

 leaf-blades 10-25 cm. long, 4-7 mm. wide, flat; ligules nearly 

 obsolete; uppermost sheath slighdy inflated, elongate, the blade 

 short; branches of inflorescence about 10, sparsely pilose, erect 

 or ascending, 3-7 cm. long, sessile; spikelets numerous on one 

 side of the branches, dense, pale green and sometimes dull 



purple; glumes narrowly lanceolate, the first 1.5 mm. long, the 

 second awn-pointed, 3^ mm. long; lemma obtuse, 3.5^ mm. 

 long, whitish hairy on upper margins, the keel obtuse, pubes- 

 cent, bowed out about the middle; the awn delicate, erect, 10-15 

 mm. long; anthers 0.3 mm. long; sterile floret single, clavate, 



1.5-2 mm. long, long-awned. Naturalized (?); Kyushu; 



very rare. China, Korea, centr. Asia, Africa, and America. 



63. COELACHNE R. Br. Hinazasa Zoku 



Delicate grasses with flat, lanceolate, short leaf-blades, and open to narrow, small panicles; spikelets pedicelled, or 1- or 2- 

 flowered, the lower bisexual, the upper, when present, pistillate; glumes 2, hyaline, with 1-3 obscure nerves, not keeled; lemmas 



