MOXOCOTYLEDOXOUS OK EXDOGENOUS PLANTS. C19 



leaves V wide ; spikes 4-8' long, on long lateral and ter- 

 minal peduncles, 2-4 in a cluster or sometimes solitary. 

 (T. monostacliyum, Willd.) 



ANDROPOGON, L. Broom Grass. 



Coarse perennial grasses, with branching erect culms, 

 long and harsh leaves, and spiked inflorescence ; spikes 

 lateral and terminal, jointed; spikelets by pairs on each 

 joint of the slender commonly hairy or plumose rachis, 

 one of then pediceledand staminate, neutral, or rudiment- 

 ary, the other sessile, 2 -/oz^ere^, the loiver flotver consisting 

 of one palea., and neutral; the upper of 2 palese, mostly 

 perfect, shorter than the herbaceous or chartaceous glumes, 

 the lower one mostly awned at the apex ; stamens 1-3 ; 

 grain free. 



Akdropogon proper. Upper flower perfect. 

 * Peduncle solitary, bearing a single spike. 



A. NuTTALLii. Culms (3°-4° high) straight, smooth, 

 like the long linear leaves ; spikes rigid, long-peduncled, 

 the rachis and pedicel of the sterile flower fringed with 

 closely appressed white hairs; sjoikelets awnless ; glumes 

 hispid above; sterile floiuer of 2 paleag, 3-androus. (Rott- 

 bcellia ciliata, Nutt.) Low pine-barrens. September. 

 Spikes 3-6' long. 



A. OLIGOSTACHYUS. Culms rigid, erect; leaves linear, 

 smooth, glaucous ; sjnkes 3-4, on short mostly included 

 peduncles, hoary with short spreading hairs ; loiuer glume 

 pubescent, |-^ as long as the contorted awn; sterile 

 flower neutral, short-awned. Dry sand-ridges. August 

 and September. Culm 2°-3° high ; spikes 2'-3' long. 



** Peduncles clustered, each bearing a single spike. 



A. scoPARius, Michx. Leaves smooth or rough-hairy ; 

 spikes numerous, on exserted peduncles, the slender flexn- 

 ous rachis, and pedicel of the awned or awnless staminate 



