ELEVENTH ANNUAL YEAR BOOK— PART XI 



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The noxious weed seeds occurring in alsike clover seed include: Dock, 



white campion, bladder campion, 

 night-flowering catch-fly, penny- 



• , cress, field peppergrass, small- 



/f^v fruited false flax, English charlock, 



^-v££> flH tumbling mustard, clover dodder, 



very rarely rat-tail plantain, buck- 

 horn, ragweed, oxeye daisy, and 

 frequently Canada thistle. 



Other common weed seeds in al- 

 sike seed include: Witch-grass, 

 yellow foxtail, green foxtail, velvet 

 grass, sedge, sorrel, knotweed, 

 lnmb's-quarters, rough amaranth, 

 wild spurry, chickweeds, mouse-ear 

 chickweed, peppergrass, shepherd's purse, cinquefoil, hop clover, yellow 

 trefoil, spurge, evening primrose, forget-me-not, vervain, catmint, healall, 

 smaller broad-leaved plantain, bracted plantain, dog fennel, field camo- 

 mile, scentless camomile. 



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

 indicating European origin of seed are uncommon in this kind of seed. 

 The examination 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 is particularly noticeable in most of the samples 

 of European alsike clover seed. 



a 



Fig. IN. — Heeds of alsike clover; a. 

 Seeds showing variation in form 

 and surface appearajice, enlarged; 

 bi natural size of seeds. 



TESTING WniTE 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- 

 yellow, 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: Dock, 

 night-flowering catchfly, pennycress, false flax, English charlock, tumb- 

 ling mustard, wild carrot, clover dodder, rat-tail plantain, buckhorn, 

 oxeye daisy, Canada thistle. 



Other weed seeds commonly appearing in white clover seed are: Witch- 

 grass, green foxtail, velvet grass, sorrel, knotweed, lady's-thumb, rough 

 amaranth, wild spurry. chickweeds, mouse-ear chickweed, forked catch- 

 fly, peppergrass, shepherd's purse, cinquefoil, hop clover, yellow trefoil, 

 wild geraniums, red pimpernel, forget-me-not, vervain, catmint, healall, 

 smaller broad-leaved plantain, field madder, wild corn salad, dog fennel, 

 field camomile, scentless camomile, hawkweed picris. 



