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 meg apot arnica, Spr. : stem-leaves right. 

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

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

 lower paleae of the flowers right. 



5. Agrostidece, — Polypogon monspeliensis, Desf. ; P. mewicanus, 

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

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



6. Arundinacece. — Calamagrostis Halleriana,T).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 Desyeuocia eriantha, H. B. K. : awns right at the lower part. 

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



7. Chloridea. — Chloris petrma, Sw. ; Diplachne poceformis, 

 Hochst. : stem-leaves right. 



8. Avenacece, — Aira do/^mc«, Wahlenb. ; Avena flavescens, 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. FestucacecB. — Poa, Bromus, Festuca Myuros, L. : stem- 

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

 F, pratensis, Huds. ; Bromus cmspitosus. Host. ; Br, rupestris. 

 Host.; Brachypodium ramosum, R. & S.; Cynosurus echinatus, L.5 

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

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

 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 madritensis, 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. Hordeaceae. — Lolium: stem-leaves right. Triticum, Se- 

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

 dus(R, L. ; E. platantherus, L. : awns left. 



SCIEN. MEM.— iV^a«. Hist. Vol. I. Part IV. 19 



