Testing Farm Seeds. 375 



(b), yellow foxtail (c), green foxtail (d), velvet grass (e), sedge (g), sorrel 

 (h), knotvi^eed (i), lamb's-quarters (1), rough amaranth (n), spreading amar- 

 anth (o), wild sparry (p), chickweeds (q and r), mouse-ear chickweed (s); 

 (fig. 20) peppergrass (b), shepherd's purse (c), cinquefoil (d), hop clover (e), 

 yellow trefoil (f), spurge (1), evening primrose (n), forget-me-not (q), ver- 

 vain (t); (fig. 21) catmint (a), healall (b), smaller broad-leaved plantain (d), 

 bracted plantain (e), dog fennel (m), field camomile (n), scentless camomile (o). 

 So little alsike clover seed is imported from Europe that weed seeds indi- 

 cating European origin of seed are uncommon in this kind of seed. The ex- 

 amination of various samples of European seed shows, however, that the weed 

 seeds found in European red clover seed, previously stated, are essentially the 

 same as those appearing in alsike seed from the same source. Clover dodder 

 (fig. 18, g) is particularly noticeable in most of the samples of European alsike 

 clover seed. 



. TESTING WHITE CLOVER SEED. 



White clover seed resembles that of alsike clover in size and form of 

 individual seeds, but the average size is slightly smaller. The light-yel- 

 low, pinkish or light-brown color of white clover seed distinguishes it 

 from the darker alsike. Adulteration is confined chiefly to the use of old 

 seed and of weedy screenings. Much seed imported from Europe is on 

 the American market. 



The purity should attain 98 or 99 per cent, the viability 99 per cent ; 

 sprouting proceeds from the second to the sixth day. 



The noxious weed seeds appearing in white clover seed include: (Fig. if) 

 dock (f), night-flowering catchfly (1), pennycress (n), false flax (p, q), English 

 charlock (t) ; (fig. 18) tumbling mustard (c), wild carrot (d), clover dodder, 

 (g), rat-tail plantain (1), buckhorn (m), oxeye daisy (q), Canada thistle (r). 



Other weed seeds commonly appearing in white clover seed are: (Fig. 

 19) witch-grass (b), green foxtail (d), velvet grass (e), sorrel (h), knotweed 

 (i), lady's thumb (k), rough amaranth (n), wild spurry, (p), chickweeds (q, r), 

 mouse-ear chickweed (s), forked catchfly (t) ; (fig. 20) peppergrass (b), shep- 

 herd's purse (c), cinquefoil (d), hop clover (e), yellow trefoil (f), wild gerani- 

 ums (i, j), red pimpernel (o), forget-me-not (q), vervain (t) ; (fig. 21) catmint 

 (a), healall (b), smaller broad-leaved plantain (d), field madder (g), wild corn 

 salad (i), dog fennel (m), field camomile (n), scentless camomile (o), hawk' 

 weed picris (s). 



White clover seed imported from Europe is often infested with most of the 

 kinds of weed seeds enumerated. American-grown seed may carry seeds of 

 (fig. 17) dock (f), night-flowering catchfly (1), false flax (q), English charlock 

 (t); (fig. 18) wild carrot (d), rat-tail plantain (1), buckhorn (m), oxeye daisy 

 (q); (fig. 19) witch-grass (b), green foxtail (d), sorrel (h), lamb's-quarters (1), 

 etc. The absence of seeds usually found only in seed imported from Europe is 

 most suggestive of the domestic origin of white clover seed. 



The weed seeds fairly characteristic of European-grown white clover seed, 

 especially when taken collectively, include: (Fig. 18) clover dodder (g) ; (fig. 

 19) wild spurry (p), chickweed (q), forked catchfly (t) ; (fig. 20) wild geranium 

 (i and j), red pimpernel (o), forget-me-not (q) ; (fig. 21) field madder (g), wild 

 corn salad (i), scentless camomile (o), hawkweed picris (s). 



