BEAL ON MICHIGAN FLORA. 27 



(Taraxacum oflicinale Weber.) 

 Tragopogon pratensis L. Goafs-beard. 

 Verbascum Blattaria L. Moth Mullen. 

 Verbascum Thapsus L. Mullen. 

 Xanthium spinosum L. Spiny Clot-bur. 



LIST OP INDIGENOUS WEEDS. 



This includes thirty-two species and very likely many more. 



Acnida tamariscina tuberculata (Moq.) Uline & Bray. Water-hemp. 



Acnida tamariscina prostrata Uline & Bray. Prostrate water-hemp. 



Amaranthus blitoides S. Wats. Prostrate Amaranth. 



Amaranthus graecizans L. Tumble-weed. 



(Amaranthus albus L.) Tumble-weed. 



Ambrosia artemisiaefolia L. Roman Wormwood. Hogweed. Ragweed. 



Artemisia biennis Willd. Biennial Wormwood. 



Asclepias Syriaca L. Common Milkweed. 



(Asclepias Cornuti Decaisne.) 



Bidens frondosa L. Beggar-ticks. Stick-tight. 



Cenchrus tribuloides L. Hedge-hog or Bur-grass. 



Chenopodium hybridum L. Maple-leaved Goosefoot. 



Cyperus rotundus L. Nut-grass. 



Cyperus esculentus L. Nut-Grass. 



Erigeron annuus (L.) Pers. Fleabane. 



Erigeron ramosus (Walt.) B. S. P. Daisy Fleabane. 



(Erigeron strigosus Muhl.) 



Euphorbia maculata L. Spotted Spurge. 



Euphorbia nutans Lag. Spurge. 



(Euphorbia Preslii Guss.) 



Hedeoma pulegioides (L.) Pers. Pennyroyal. 



Helianthus tuberosus L. Jerusalem Artichoke. 



Iva xanthiifolia (Fresen.) Nutt. Marsh Elder. 



Lepidium Virginicum L. Peppergrass. 



Leptilon Canadense (L.) Britton. Horse-weed. Fleabane. 



(Erigeron Canadensis L.) 



Onagra biennis (L.) Scop. Evening-primrose. 



((Enothera Mennis L.) 



Panicum capillare L. Old-witch Grass. 



Plantago major L. Plantain. 



Plantago Rugelii Decaisne. Plantain. 



Polygonum aviculare L. Knotgrass. 



Polygonum erectum L. Erect Knotgrass. 



Polygonum littorale Link. Shore Knotweed. 



Prunella vulgaris L. Heal-all. 



(Brunella vulgaris L.) 



Rudbeckia hirta L. Yellow Daisy. Black-eyed Susan. 



Urtica gracilis Ait. Tall Wild Nettle. 



Xanthium Canadense Mill. Cocklebur. Clotbur. 



NATIVE POISONOUS PLANTS. 



Besides two species of nettles, Urtica gracilis Ait., and Urticastrum 

 divaricatum (L.) Kuntze, there are only two species of native plants 

 which are of any prominence as poisonous to the touch, and often these 

 two are not poisonous to all persons. The latter plants or shrubs, are 

 known as poison sumach or poison dogwood (Rhus Vernicc L.), and poison 

 ivy, or poison oak (Rhus radicans L.). The last named plant is the 

 most troublesome, as it is often common on dry land, while the one 

 previously noticed is confined to swamps which are not so often fre- 

 quented. Poison ivy has three leaflets to each leaf, while the handsome 

 Virginian Creeper, often confounded with it. usually ha.s five leaflets to 

 the leaf, and is harmless. The roots, leaves or flowers of many of the 



