MICHIGAN ACADEMY OF SCIENCE. 123 



Saxifragaceae. Saxifrage Family. 



319. Saxifraga virginiensis Michx. Early Saxifrage. Rock shore cre- 

 vices. 



320. Saxifraga tricuspidata Rottb. Rock shore crevices, frequent. 



321. Saxifraga Aizoon Jacq. Rock shore crevices, rare. 



322. Mitella nuda L. Mitrewort. Climax forest; bog forest. 



323. Parnassia parvifiora DC. Grass of Parnassus. Margins of rock 

 pools, and sheltered crevices. 



324. Parnassia palustris L. Same habitat as last. 



325. Ribes oxyacanthoides L. Gooseberry. Shore rocks, and rocks in 

 climax forest. 



326. Ribes lacustre (Pers.) Poir. Swamp Black Currant. Duncan Bay. 



327. Ribes prostratum L'Her. Skunk Currant. Climax forest; burn 

 forest. 



328. Ribes triste Pall. Wild Red Current. McCargoe's Cove. 



329. Ribes triste Pall var. albinervium (Michx.) Fernald. Climax forest. 



Rosaceae. Rose Family. 



330. Physocarpus opulifolius (L.) Maxim. Nine-bark. Shingle beaches; 

 shrub zone of Delta Swamp Succession; rock shore crevices. 



*331. Pyrus melanocarpa (Michx.) Willd. Black Chokeberry. '^A single 

 specimen noted on north side of Rock Harbor." Holt. Also Whitney. 



332. Pyrus americana (Marsh) DC. Mountain Ash. Climax forest, 

 scattered, more abundant along its edge; persisting after fires and making a 

 portion of the burn forest; shingle beaches; often the only tree upon exposed 

 rocky islets, for example. Gull Islands. 



333. Amelanchier canadensis (L.) Medic. Shad Bush; Service Berry. 

 Rock shore crevices and bare burned ridges. 



334. Amelanchier oblongifolia (T. and G.) Roem. 



335. Amelanchier spicata (Lam.) C. Koch. 



336. Amelanchier oligocarpa (Michx.) Roem. Rock shore crevices; bare 

 burned ridges; occasional in bog and climax forests. 



337. Fragaria virginiana Duchesne. Wild Strawberry. Heath mat; burn 

 forest; clearings. 



338. Fragaria vesca I., var. americana Porter. Smithwick Island. 



339. Waldsteinia fragarioides (Michx.) Trattinick. Barren Strawberry. 

 Burn forest : Sargent Lake trail near Rock Harbor. 



340. Potentilla arguta Pursh. "N. to Isle Royale." Beal. 



341. Potentilla monspeliensis L. Rock crevices; clearings. 



342. Potentilla pennsylvanica L. Rock shore crevices. 



343. Potentilla palustris (L.) Scop. Marsh Five-finger. Aquatic and 

 sedge zones, Bog and Delta Swamp Successions. 



344. Potentilla fruticosa L. Shrubby Cinquefoil. Shore crevices; shrub 

 zone of Bog Succession: head of Siskowit Bay. 



345. Potentilla tridentata Ait. Three-toothed Cinquefoil. The common- 

 est species in rock shore crevices, persisting into the heath mat stage; also 

 common upon interior cliffs and bare burned ridges. 



346. Potentilla Anserina L. Silver Weed. Sand beaches. 



347. Potentilla canadensis L. 



348. Rubus idaeus L. var. aculeatissimus (C. A. Mey.) Regal and Tiling. 

 Red Raspberr}'. Shingle beaches; rock shore crevices; follows the fireweeds 

 in the Burn Succession, and persists into the burn forest stage. 



