HORTUS GRAMINEUS WOBURN ENSIS. 391 



as well as, in a degree, for every other kind of vegetable, may be 

 called general impoverishers. 



If the nutritive matter of the following plants be examined with 

 this view, they will be found to rank either as general or partial 

 impoverishers. 



General Impoverishers. 

 Oats, 

 Rye, 

 Potatoes, 

 Carrots, 

 Mangel-wurzel, 

 Cabbages, 

 Kohl-rabi, 

 Bunias Orientalis. 



Partial Impoverishers. 

 Wheat, 

 Pease, 

 Beans, 

 Turnips, 

 Clovers, 

 Sainfoin, 

 Lucern, 

 Grasses, when mown. 



It does not fall within the limits of these pages to give an 

 account of all the plants employed in the Alternate Husbandry, 

 but only of such as have been more particularly submitted to ex- 

 periment in this series. There have been, however, several plants 

 of this class made trial of, with respect to the quantity of nutritive 

 matter they contain, some account of which will be found in the 

 Notes given in the following pages. 



TRIFOLIUM macrorhizum. Long-rooted Clover. 



Specific character : Legumes racemed, naked, one-seeded, bow- 

 striated, semi-ovate, stem erect. Hort. Gram. Fol. 291. 

 Fig. 1. Calyx and Anthers. 



Obs. This plant appears to be the T. massanense, Linn. Syst. 

 687 ; and of Morison, the " Melilotus minima recta lutea, sili- 

 quis crassis, curtis in capitulum congestis radiatis semine 

 famugrseci." Hist. ii. t. 16, f. 9, et t. 15, f. 9. Sicilian Melilot 

 Trefoil. Leaves ternate, fleshy, subserrate; flowers yellow, 

 small ; legumes rather oblong, whitish, wrinkled, with semi- 

 circular streaks ; seeds bigger than in T. melilotus officinalis, 

 (Lin. Mant.) ; racemes axillary, short, erect ; legumes one or 

 two-seeded, subcompressed, pendulous, oblong, attenuated 

 at both ends, acute, slightly curved in one side (Desfont.). 



Native of Siberia, or, according to the above, Italy, Sicily, and 

 Barbary. Root biennial. 



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

 rich clayey loam is 



