ARRHENATHERUM. KCELERIA. 399 



branches, fl. erect 3 6 exceeding the glumes, 1. scabrous. 

 E. B. 1204. P. 52. Height nearly 2 feet. St. usually nearly 

 round. L. usually short, narrow, acute. Pan. -branches usually 

 simple with only one spikelet. /3. longifolia (Para.); 1. much 

 longer. y. alpina; st. often compressed and sheaths keeled, 

 pan.-branches often with several spikelets, spikelet with more fl., 

 upper pale less acute, 1. broader. I believe that none of these 

 characters are permanent. E. B. 2141. P. 53. A. planiculmis 

 of E. B. S. 2684 appears to belong to this species, differing in 

 its greatly compressed St., strongly keeled sheaths and more 

 branched panicle. In a. and j3. the lowest fl. sometimes slightly 

 falls short of the longer gl., in y. exceeds it. Dry pastures and 

 mountainous places. P. VI. 



4. A. pubescens (L.); pan. erect nearly simple, fl. erect 2 or 

 3 scarcely exceeding the glumes, lower /. and sheaths hairy. 

 E. B. 1640. P. 53. Height 12 feet. L. short, rounded behind 

 the tip. Chalky and limestone districts. P. VII. 



30. ARRHENATHERUM Pal. de Beauv. Oat-grass. 



1. A. avenaceum (Beauv.); 1. flat. Holcus Sm., E. B. 813. 

 P. 25. Height 23 feet. Root fibrous. Knots of the st. gla- 

 brous, sometimes downy. Pan. long, ultimately close. Spike- 

 lets greenish. . A. bulbosum (Lindl.); base of the st. with 

 swollen knobs, knots downy. P. 26. Hedges and pastures. 

 P. VI. 



Tribe XL Festucea. 

 31. TRTODTA R. Br. Heath-grass. 



1. T. decumbens (Beauv.); pan. racemose, spikelets few oval, 

 fl. about 4 scarcely extending beyond the glumes without awns. 

 E. B. 792. P. 30. St. 612 in. high. L. flat. Sheaths 

 rather hairy. Ligule a tuft of hairs. Spikelets few, 1 7- Gl. 

 smooth, coriaceous, hiding the fl. Lower pale with 3 points, 

 5-ribbed, hairy at the base. Mountain pastures. P. VII. 



32. KCELERIA Pers. Crested Hair-grass. 



1. K. cristata (Pers.) ; pan. compact spikelike interrupted 

 below, lower pale acute, 1. narrow rough at the edges ciliate. 

 Aira Sm., E. B. 648. P. 19. Root crowned with the undivided 

 sheaths of the old leaves. St. 6 18 in. high, downy particularly 

 in the upper part. L., gl. and pales downy or glabrous. Gl. 

 finely toothed on the keel. Lower pale finely toothed on the 

 midrib. Sometimes the 1. become convolute. In dry places the 

 1. are much shorter than the st., in damper places long and often 



