354 HOUTUS GRAMINEUS WOBURNENSIS. 



common variety has a bulbous root. The Alopecurm btdbo- 

 sus may be distinguished from the bulbous-rooted variety of 

 the knee-jointed species by its upright culms, which want the 

 knee-jointed form so conspicuous in the culms of the former. 

 The anthers are at first of a purple colour, but afterwards 

 become ferruginous. Sm. Engl. Fl. i. p. ; E. Bot. 1250; 

 Wither, ii. p. 120; Flo. Rust. t. 97 ; Host. t. 32; Curt. Lond. 

 t. 57 ; Hort. Gram. Fol. 245. 



German, Gegliedeter-Fuchsschzcanz. 



Native of Britain. Root perennial. 



Experiments. — At the time of flowering, the produce from a 



rich moist alluvial soil is — 



Produce per Acre. 



dr. qr. lbs. 



Grass, 10 oz. The produce per acre - 6806 4 



80 dr. of grass weigh, when dry - 34 7 9892 10 



The produce of the space, ditto - 68 3 



The weight lost by the produce of one acre in drying 3913 10 



64 dr. of grass afford of nutritive matter 2 3^ qq^ n a 



The produce of the space, ditto - 6 3^ 3 



This produce may be considered the greatest that this grass is 

 capable of affording under ordinary circumstances; for the produce 

 from clayey, sandy, and peaty soils was, in each instance, inferior 

 to the above. In an open drain, in a rich water-meadow, where 

 this grass appeared to have attained the highest degree of luxu- 

 riance, some of the shoots measuring two feet and a half in length, 

 the weight of produce was but 14 oz. ; on drier ground in the same 

 meadow it weighed only 5 oz. It grows common in surface- 

 drains, and at the entrance of cattle-ponds, particularly where the 

 soil is clayey. It does not appear to be eaten with much relish 

 by either cows, horses, or sheep. Its nutritive powers are not 

 considerable, and its sub-aquatic natural place of growth excludes 

 any recommendation of it for cultivation. 



Flowers in the first week of June, and during the summer. 



GLYCERIA aquatka. Reedy Sweet-Grass. 



Poa aquatica. Water Meadow-Grass. Hort. Gram. Fol. 246. 



Specific character : Panicle erect, repeatedly branched, spread- 

 ing ; florets numerous, obtuse, with seven ribs ; nectary 

 cloven, acute. Sm. Engl. Fl. i. p. 116. — Fig. 1. Spikelet of 

 flowers, magnified. 2. The Germen. 



