M. WICHURA ON THE WINDING OF LEAVES. 289 



right. Apparently the winding of the leaves is more rare in 

 this section, inclined to a broader development of the leaves. 



4. Stipacece. Stipa mongolica, Turcz. ; Lasiagrostis Calama- 

 grostis, Lk. ; Aristida megapotamica, Spr. : stem-leaves right. 

 Aristida vestita, Thunb. ; A. chapadensis, Trin. ; A. Kotschyi, 

 Hochst.; A. divaricata, H. B.W. ; A. Sieberiana, Trin.. &c. : 

 lower paleas of the flowers right. 



5. AgrostidetR. Polypogon monspeliensis, Desf. ; P. mexicanus, 

 Spr. ; Agrostis canina, L. ; A. vulgaris, Withering : stem-leaves 

 right. Apera Spica-venti, Beauv. : stem-leaves left. 



6. Arundinacea. Calamagrostis Halleriana, D.C.; C.Langs- 

 dorfii, Trin. ; C. littorea, D.C. ; Arundo poceformis, Labil. : stem- 

 leaves right. Desyeuxia retrofracta, Kth. ; Lachnagrostis splen- 

 dens, Trin. : stem-leaves left. Calamagrostis sylvatica, R. Br., 

 and Desyeuxia eriantha, H. B. K. : awns right at the lower part. 

 For the stem-leaves of Calamagrostis Epigeios, Roth, see 44. 



7. Chloridece. Chloris petr&a, Sw. ; Diplachne poa/ormis, 

 Hochst. : stem-leaves right. 



8. Avenaceas. Air a bottnica, Wahlenb. ; Avenaflavescens, L. : 

 stem-leaves right. Trisetum neglectum, R. & S. ; TV. Alopecurus, 

 R. & S. : stem-leaves left. For the doubly wound stem-leaves 

 and awns of the Avenaceae, as also the doubly wound awns of 

 the Grasses generally, see 42, 43. 



9. Festucacece. Poa, Bromus, Festuca Myuros, L. : stem- 

 leaves left. Festuca alpina, Sut. ; F. arundinacea, Liljebl. ; 

 F. pratensis, Huds. ; Bromus c&spitosus, Host. ; Br. rupestris 9 

 Host.; Brachypodium ramosum, R, & S.; Cynosurus echinatus, L.; 

 Briza media, L. ; Melica pyramidalis, Lam. : stem-leaves right. 

 As the genera Bromus and Festuca are so extremely nearly allied, 

 it is important for their distinction that the former are predomi- 

 nantly wound to the left, the latter to the right. For the stem- 

 leaves of Festuca rubra, Huds., and Melica altissima, see 44. 

 Bromus ?nadritensis, L. ; Br. rubens, L. ; Br. scaberrimus, Te- 

 nore : awns slightly left. Bromus confertus, M. B. ; Br. wol- 

 gensis, Spr. ; Br. patulus, M. & K. ; Br. lanceolatus, Roth : awns 

 slightly left. 



10. Hordeacece. Lolium: stem-leaves right. Triticum, Se- 

 cale, Elymus, Mgilops: stem-leaves left. Elymus Caput-Me- 

 dusa, L. ; E. platantherus, L. : awns left. 



SCIEN. MEM. Nat. Hist. VOL. I. PART IV. 19 



