CATALOG OF PLANTS. 97 



455. Physocarpus opulifolius (L.) Maxim. Nine-bark. — Frecjuent 



aloiiti' streams and ])orders of woods. Also on the islands. 



456. Spiraea salicifolia L. ^Iea(k)\v-sweet. — Common on low ground, 



on borders of marshes, ponds, and often on damp sand be- 

 tween sand dunes. 



457. Sorbaria sorbifolia (L.) A. Br. Mountain ash spiraea. — Inclined 



to escape to sandy ground in villages. 



458. Pyrus baccata L. Siberian oral). — On Stony Islantl. apparently 



part of an old abandoned orchard. 



459. Pyrus coronaria L. American crab. — In thickets and open 



woods l)ut usually not common. Rare on the islands. 



460. Pyrus malus L. Ajiple. — Frequent throughout the sand region. 



461. Pyrus arbutifolia atropurpurea (Britton) Robinson. Choke- 



berry. — Noticed in very wet places between sand dunes 

 near Caseville and Rush Lake, and often over ten feet high. 



462. Pyrus melanocarpa (Michx.) Willd. Black chokeberry.^ — Fre- 



(pient on damp ground, occasional on damp sand. 



463. Amelanchier canadensis (L.) Medic. Juneberry; May-cherry. — 



Frequent along banks of streams and on sandy ground 

 throughout the sand district. Abundant at Sand Point 

 and on Stony Island. 



464. Amelanchier oblongifolia (T. and G.) Roem. Shad-bush. — 



Abundant at Sand Point. Frec[uent on sand dunes. 



465. Amelanchier spicata (Lam.) Koch. Round-leaved Juneberry. 



— Abundant at Sand Point and on Stony Island. Common 

 on sand dunes throughout. Fruit comparatively large and 

 very palatable. 



466. Crataegus crus-galli L. Cockspur thorn. — Frequent in dry 



ground throughout. Crataegus attenuata Ashe and C. 

 arduennae Sarg. 



467. Crataegus punctata Jacq. Large-fruited thorn. — Frequent 



throughout the sand district and on the islands. 

 Throughout the sand dune district and on the islands of Saginaw 

 Bay many species of Crataegus were noticed that are not yet identi- 

 fied. These were formerly included under C. coccinea. 



468. Fragaria virginiana Duchesne. Common strawberry. — Common 



throughout. 



469. Fragaria vesca americana Porter. American wood strawberry. 



Freciuent in damp open woods and thickets. 



470. Potentilla monspeliensis L. Rough cinquefoil. — A common 



weed in villages, adjacent fields, and about fishery buildings. 



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