The Preservation And Management of Vegetation in Ravines in Highland Park Illin
The Preservation And Management of Vegetation in Ravines in Highland Park Illin
Kenneth Ray Robertson
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Commonly cultivated and either planted and persistent or escaped in the ravines. Pinus strobus . \^ite Pine, Native, but most plants presently in the ravines probably deliberately planted. Populus deltoides . Cottonwood. Native. Mostly in bottoms, sometimes on slopes, especially toward Lake, Common. Prunus pensylvanica . Pin or Fire Cherry. Native. Slopes. Infrequent. April-June. Prunus serotina . Black Cherry. Native. Slopes. Common. May- June. Prunus virginiana . Choke Cherry, Native. Slopes.... Common- April- June. Quercus alba . White Oak. Native. Mostly on tablelands, sometimes on upper slopes. Common. Quercus rubra . Red Oak. Native. Lower slopes and bottoms. Common. Rhamnus cathartica . Common Buckthorn, Introduced from Eurasia. Common, May. Rhus radicans . Poison-ivy. Native. Throughout. Very Common. Rhus typhina . Staghorn Sumac. Native or possible introduced from farther east. Slopes, especially toward Lake. June-July. 17 - Ribes americanum . Wild Black Current. Native. Edge of stream in bottom.
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