Ord. 3.] TRIANDRIA DIGYNTA. 21 



3. H. avendceus, 12. 813. (Oat-like S.) Calyx-valves unequal, 



smooth. Barren floret lowest, with a sharply-bent prominent 



awn, fertile one slightly elevated, scarcely awned. Root knotty. 



Past. & by road-sides. 2f . 6, 7. L. roughish, deep green. Pan. elong. 



41. HIERoCHLOE. Holy-grass. 



1. H. boredlis, Suppl. 2641. (Northern H.) Panicle somewhat 

 unilateral, with smooth flower-stalks. Perfect florets awnless ; 

 barren ones slightly awned. Nectary in two deep, unequal, 

 linear segments. 

 Lofty glens in Scot. If-. 5, 6. Fragrant when dry. L. flat. 



42. Me LIC A. Melic-grass. 



1. M. uniflura, 15. 1058. (Wood M.) Panicle branched, unilateral, 



Flowers erect. Spikelet with only one perfect floret. Petals 

 beardless. 

 Groves. If . 5, 6. Rootfibr. Fert.flor. sessile ; barren one stalked. 



2. M. nutans, 15. 1059. (Mountain M.) Panicle close, drooping, 



nearly simple. Flowers pendulous. Spikelet with two perfect 

 florets. Petals beardless. 

 Mount, woods. If. 6, 7. Root creeping. Fert. flor. 2 ; barr. 

 1 or 2, long-stalked. 



3. M. cm-idea, 11. 750. (Purple M.) Panicle close, erect, compound. 



Flowers upright, cylindrical. Petals beardless, acute. 

 Barren watery pi. If.. 8. Root bulb. Pan. violet-coloured, 

 many -flowered. 



43. SESLeRIA. Moor-grass. 



1. S. carulea, 23. 1613. (Blue M.) Spike ovate-oblong, imbricated. 



Bracteas alternate. Exterior valve of the corolla with three teeth. 



Moist chalky mount. If. 4. About \ f. Leaves flat. Spike short. 



44. GLYCERIA. Sweet-grass. 



1. G. aqudtica, Poa aquat. 19. 1315. (Reedy S.) Panicle erect, 



repeatedly branched, spreading. Florets numerous, obtuse, 

 with seven ribs. Nectary cloven, acute. 

 Ditches and riv. If. 7. Smooth. \ f. Leaves sword-sh. Stip. entire. 



2. G.fliiitans, P. fluit. 22. 1520. (Floating S.) Panicle oblong, 



branched, divaricating. Spikelets close-pressed. Florets nu- 

 merous, obtuse, seven-ribbed, with short intermediate ribs at 

 the base. Nectary obtuse, tumid. 

 Ditches and rivul. If. 6 — 8. R. creeping. L. obtuse. Stip. notched. 



3. G. distans,F. dist. 14.986. (Reflexed S.) Panicle branched, spread- 



ing ; the branches finally reflexed. Florets about five, obtuse, 

 obscurely five-ribbed, polished. Root fibrous. 

 Waste sandy shores. If. 7. Stems 1 f. Leaves glauc. 



4. G. maritima, P. marit. 16. 1140. (Sea S.) Panicle branched, 



rather close ; erect after flowering. Florets about five, some- 

 what pointed, slightly five-ribbed. R.oot creeping. 



