90 CATALOG OF PLANTS. 



320. Cannabis sativa L. Hemp. — On sandy ground as a weed in the 



villages. 



321. Humulus lupulus L. Common hop. — Noticed as an" escape near 



Caseville, Rush Lake, Port Austin, Bayport, and Sebewaing. 



322. Madura pomifera (Raf.) Schneider. Osage orange. — Occasion- 



ally planted for hedges, but not a success. Not spreading. 



323. Urtica gracilis Ait. Slender nettle. — Frequent along streams, 



in open damp woods and low ground. 



324. Laportea canadensis (L.) Gaud. Wood nettle. — Common in 



rich woods. 



325. Pilea pumila (L.) Gray. Richweed. — In damp rich woods near 



Rush Lake, Port Austin and Sebewaing. 



326. Boehmeria cylindrica (L.) Sw. False nettle. — Frequent on 



moist and shaded ground. 



327. Comandra umbellata (L.) Nutt. Bastard toad-flax. — Abun- 



dant on flat or dry rolling ground and frecjuent on fixed 

 shaded sand dunes. 



328. Arceuthobium pusillum Peck. Dwarf mistletoe. — A para.site 



on Picea mariana on a little island in Rush Lake, where the 

 trees are being attacked and killed by it. 



329. Asarum canadense L. Wild ginger. — Common in rich woods. 



330. Rumex britannica L. Great water dock. — On low marshy open 



ground near Rush Lake, Port Austin and Sebewaing. 



331 . Rumex crispus L. Yellow dock. — Frequent as a weed in villages 



and adjacent fields throughout the sand region. A trouble- 

 some weed in meadows and hay fields. 



332. Rumex obtusifolius L. Bitter dock. — Occasional as a weed in 



villages and around country dwellings. 



333. Rumex acetosella L. Field sorrel. — Occasional as a weed on 



poor -ground. 



334. Polygonum aviculare L. Knotgrass. Knotweed. — Common as 



a weed in villages and about country dwellings. 



335. Polygonum erectum L. Erect knotweed.— Occasional near 



Rush Lake and Port Austin. 



336. Polygonum lapathifolium L. Dock-leaved persicaria. — In a wet 



place at Port Austin and frec^uent below Grindstone City. 



337. Polygonum amphibium L. Water persicaria. — Frequent in very 



w^et and marshy places at Sebewaing, Port Austin, Bayport, 

 and near Rush Lake. 



338. Polygonum amphibium hartwrightii (Gray) Bissel. Hart 



Wright's persicaria.— On very wet ground at Port Austin 

 and near Rush Lake. 



339. Polygonum muhlenbergii (Meisn.) Wats. Swamp persicaria. — 



