112 



THE TRUE GRASSES. 



Fig. 54. — Calamagrostis 



like, shining, flowering glume downy ; awns almost basal, 

 geniculate. 



Species one (T. nitens Link), in the western countries 

 of the Mediterranean region. 



136. (133) Calamagrostis Both (Figs. 54 and 55). Pani- 

 cles very variable ; hairs on the callus of the flowering 



glume sometimes short and sometimes 

 longer than the glume itself, which is 

 usually thin-membranaceous and vari- 

 ously awned. Frequently reed -like in 

 habit. The spikelets usually larger 

 than those of Agrostis. 



Sec. I. Epigeos Koch. Bachilla not 

 produced ; hairs on the callus usually 

 long. 



Species ten, in the north temperate 

 zone of the Old World, including G. 

 Epigeos (L.) Both, G litorea DC, G. 

 NSrGen. D Ger^f te L lanceolata Both, and G Halleriana DC. 

 34 - } Sec. II. Deyeuxia Beauv. (as a 



genus). Usually with a hairy prolongation 

 of the rachilla ; callus hairs shorter than in 

 Sec. I, very rarely wanting. 



Species over one hundred and twenty, 

 distributed throughout all the temperate 

 and arctic zones, also upon the high moun- 

 tains of the tropics ; about sixty species in 

 the Andes alone. [Galamagrostis Tweedyi, 

 Suksdorfii, Montanensis, and ambigua Scribn. 

 are Bocky Mountain species.] 



Achcete Fourn., Belchela Steud., Cinnas- 

 trum Fourn. are more or less anomalous 

 species of this section. 



137. (139) Cinnagrostis Griseb. Like the 

 preceding, but with unisexual spikelets ; rachilla with a 

 long and very hairy prolongation ; callus short, bearded. 



Species one (G. polygama Griseb.), in the Argentine 

 Bepublic. 



138. (141) Ammophila Host. (Psamma Beauv.) Pani- 

 cles usually narrow and spike-like. Flowering glume 



Fig. 55. — Calama- 

 grostis (Deyeu- 

 xia) sylvatica. 

 (After Nees, 

 Gen. Germ., I. 

 34.) 



