The Flora of the Cayuga Lake Basin 



455 



Ilabcnaria dilatata 

 Spiranthes Romanzoffiana 

 E pi pact is tesselata 

 Populus tacamahacca 

 Salix serissima 

 Draba arabisans 

 Saxifraga aizoides 

 Lathyrus palustris 

 Geranium Bicknellii 

 Viola renifolia, var. Brainerdi 



Hippuris vulgaris 



Pyrola asarifolia, var. incamata 



Kalmia polifolia 



Primula mistassinica 



Pinguicula vulgaris 



Galium trifidum 



Galium labradoricum 



Louie era oblongifolia 



I 'aleriana uliginosa 



Pet a sites palmatus 



Of these, Saxifraga aizoides, Primula mistassinica, and Pinguicula vulgaris con- 

 stitute a very interesting group of boreal plants found elsewhere in New York only 

 in two or three very restricted localities, where generally they grow on cool, shady, 

 dripping, lime cliffs protected from the sunlight. They all occur on the south wall 

 of Taughannock Gorge; the two latter are found in Fall Creek Gorge, and the 

 last one also in Cascadilla Glen. It is supposed that they represent a northern 

 flora which once was more common here. As plants migrated northward follow- 

 ing the retreat of the glacier, certain colonies of these plants were left behind 

 while the main body continued northward. These colonies retreated to the 

 shaded wet walls of the ravines then forming, or to cold springs, where they now 

 remain isolated from the main range of the species. Carcx capillaris was thus 

 isolated in the cold springs and marl ponds at Cortland, where it represented 

 the only known station in New York State ; but it is now probably exterminated, 

 due partly to the use of the springs as a city water supply. 



The southern element in the flora is represented by many plants, among which 

 the following 53 species extend northward only to central New York, or in a few 

 instances to the north shore of Lake Ontario (indicated by a capital O). 



J: I y in us austral is 



Muhlcnbergia tenuiflora O 



Panicum flexile 



Panicum znrgatum O 



Panicum depauperatum O 



Panicum sphaerocarpon 



Pan icum villosissimum 



Panicum umbroswm 



Panicum Boscii 



Cy pcrus ferax 



Cypcrus erythrorhizos 



Cy perns Engelmanni 



Eleocharis quadrangulata 



Fimbristylis autumnalis 



Sclcria verticillata O 



Carcx digitalis O 



Carex retroflexa O 



Carex Muhlenbergii, var. enervis 



Carcx triceps, var. hirsuta 



ll'olffia columbiana O 



J uncus margiuatus 



Habcnaria ciliaris 



Triphora trianthoplwra 



Jsotria verticillata 



C orallorrhiza odonlorliiza 



Polygonum robustius 



Silene stellata 



Cimieifuga racemosa 



Agrimonia rostellata 



Agrimonia mollis 



Agrimonia parviflora 



Crataegus Boyntoni 



Crataegus intricata 



Lespedeza violacea 



Desmodium rotitndifolium 



Desmodium bracteosum 



Desmodium marilandicum 



Tcphrosia virginiana 



L in um virg inianum 



Geranium carolinianum 



Viola affinir 



Sanicula canadensis O 



Nyssa sylvatica 



Chimaphila maculata O 



Gentiana quinquefolia O 



Asclepias tuber osa O 



Monarda punctata 



Physalis hcterophylla, var. ambigua 



Pliysalis subglabrata 



Conopholis americana O 



Galium pilosum 



Solidago ulmifolia 



Rudhcckia speciosa 



