SPECIES AND VARIETIES. 335 



(304) Rhynchospora. Beak-sedge. 

 R. alba : stems 6-9 inches high, slender, forming dense 

 tufts; leaves chiefly radical, short, subulate, the floral ones 

 scarcely exceeding the flowers; spikelets nearly white, in a 

 small, loose terminal cluster, often with one or two smaller 

 clusters on slender peduncles in the axils of the next leaves. — 

 Turfy bogs. Fl. July. 



(305) Milium. Millet-grass. 



M. efiusum : stem tall, slender, 4—5 feet high ; leaves 

 short, flat; panicle long, loose, slender, spreading. — Moist 

 woods. Fl. June, July. 



(306) Digraphis. 



D. arundinacea : stems reed -like, 2-3 feet high ; leaves 

 rather broad, long; panicle upright, wdth short spreading 

 branches; spikelets numerous. — River-banks and marshes. 

 Fl. July. The Ribbon-grass of gardens is a variety with va- 

 riegated leaves. 



(307) Phleum. Cat's-tail-grass. 



P. pratense : stem 1-3 feet high ; leaves rough on the 

 edges ; spike or spike-like panicle cylindrical, very compact, 

 1-4 inches long ; outer glumes truncate at top, with broad 

 scarious edges. — Timothy-grass. — Meadows and pastures. Fl. 

 June to October. 



P. arenarium : annual ; stem erect, 6-8 inches high ; leaves 

 short; spike about an inch long, dense, nearly cylindrical, 

 tapering at the base; spikelets about 1^ line long; outer 

 glumes lanceolate, tapering into a short point. — Maritime 

 sands. Fl. June. 



