DEPARTMENT REPORTS. 177 



Paspalum sp 2 



Persicaria aviculare, Knotweed 14 



Persicaria hydropiper, Smartweed 5 



Persicaria persicaria. Lady's Tbiimb 156 



Plileum pratense. Timoth}' 640 



Picris echioides, Ox-tongue 3 



Picris liieracioides, Hawkweed Picris 2 



Plantago aristata, Bracted Plautaiu 10 



Plantago lanceolata, Buckhorn 531 



Plantago major, Broad-leaved Plantain 101 



Plantago rugelii, Kugel's Plantain 286 



Poe annua, Annual Spear Grass 3 



Poa compressa, Canada Blue Grass 23 



Poa nemoralis, Wood Meadow Grass 7 



Poa pratensis, Kentucky Blue Grass 35 



Poa sp 160 



Portulaca oleracea, Purslane 1 



Potentilla spp., Five Finger Cinqnefoil 167 



Prunella vulgaris. Heal-all 26 



Ranunculus sp., Buttercup 6 



Rubus sp 1 



Rudbeckia hirta, Browu-eyed Susan 13 



Rumex acetosa. Sour Dock 6 



Rumex acetosella, Sheep Sorrel 281 



Rumex crispus, Curled Dock 292 



Rumex obtusifolius, Bitter Dock 1 



Rumex sp., Dock 60 



Salsola pestifer, Russian Thistle 44 



Scirpus, Club Rush 9 



Scrophularia sp., Figwort 2 



Secale cereale, Rye S 



Sherardia arvensis, Blue Field Madder 8 



Sida spinosa. Prickly Sida 2 



Silene antirrhina, Sleepy Catchfly 1 



Silene dichotoma, Forked Catchfly 9 



Silene noctiflora, Night Flowering Catchfly 301 



Silene sp 11 



Solanum nigrum. Black Nightshade IS 



Sonchus arvensis, Sow Thistle 1 



Sonchus asper. Spiny Sow Thistle 8 



Spergula arvensis, Spurry 5 



Sporobolus sp., Rush Grass 7 



Stipa sp 1 



Syntherisma ischaemum, Small Crab Grass 93 



Syntherisma sanguinale, Large Crab Grass 21 



Sudan Grass 3 



Teucrium canadense. Wood Sage 1 



Thlaspi arvense, Penny Cress 6 



Tiniaria convolvulus. Wild Buckwheat 10 



Trifolium hybridum, Alsike Clover 753 



Trifolium incarnatum, Crimson Clover 5 



23 • 



