62 TRIANDRiA.— DIGYNIA. 



76. CERATOCHLOA. 



C. nnioloides : panicle nodding, spreading ; spikelets 

 oblong-lanceolate, compressed, 6 — 8-flowered ; flo- 

 rets acuminate, unarmed ; sheaths bearded at the 

 throat ; the lower ones hairy ; root fibrous. 



HAB. Rich bottom lands. July — Aug. © and U. 

 Culm 12 — 18 in. high; leav. pubesc; pan. small: 

 branch, geminate, pubesc. 



11. DIARRHENA. 



D. americana. 



HAB. Banks of rivers. U . Culm erect, nearly naked, 

 slender; leav. rad. ; broad; pan. racemose; spik. 

 about 2-fl. ;fl. diverging ; cor. smooth ; stam. 2 — 3. 



78. DACTYLIS. Orchard-grass. 



O. glomerata : panicle secund, glomerate ; leave* 



carinate. 

 HAB. Fields, meadows, &c. May — June. U. Culm 



2 — 3ft. high ; panic, contract, glum, strongly ciliate. 



79. DANTHONIA. 



D. spicata : panicle simple, appressed ; spikelel* 

 7 — 9, about 7-flowered ; inferior valve of the co- 

 rolla hairy ; leaves subulate ; lower sheaths hairy 

 at the throat. 



TIAB. Dry woods and sandy fields. June — July. U . 

 Culm cespitose, 18 in. — 2 ft. high ; leav. hairy above ; 

 pan. spiked. 



80. TRISETUM. 



I. T. palustre: panicle contracted, nodding, somewhat 

 verticillate ; calyx 2 — 3-flowered ; florets smooth, 

 acuminate ; the inferior one swnless ; inferior valve 

 of the superior floret bicuspidate, awned below the 

 tip. 

 HAB. Wet meadows. June — July. U . Culm 1 — 2 

 ft. high, erect ; leav. flat, smooth ; pan. few fl., pah 

 green. 



1. T. purpurascens : panicle very simple, somewhat 

 racemose, few-flowered ; calyx 3-flowered ; glumes 



