THE FLORA OF SITKA, ALASKA 435 



Other plants found in this habitat arc as follows: 



Coptis trifolia Limnorchis leucostachys 



Dodecatheon sp. Parnassia palustris 



Gentiana douglasiana , Pinguicula villosa 



Juncus balticus Pinguicula vulgaris 



Juncoides campestre Scirpus caespitosus ' 



Lycopodium annotinum Tofieldia intermedia 



Lycopodium elavatum Trientalis arctica 



Limnorchis dilatata 



AQUATIC FLORA. 

 (PLATE XXIII.) 



So far as the higher forms of plant life are concerned, this 

 is the smallest division of the flora. Only one species has been 

 noted as occurring in salt water and that is Zostera marina. 

 The fresh water forms are a water lily (Nymphaea polysepala), 

 two species of Potamogeton (P. natans and P. heteropkyllus) , 

 Cdllitricht verm, and Myriophyllwm sp., Menyanthes trifolia. 

 Comarwm palustre, Spcvrganium sp., and Co rex spp. represent 

 the semiaquatic species. 



ALPINE FLORA. 



Under this head are included all species that reach their 

 maximum abundance at or above the ordinary line of timber, 

 which in some cases may be somewhat less than 2.500 feet. 

 Most of these belong to the Arctic-Alpine life zone, but some 

 lludsonian species are included. Their typical habitat is the 

 Alpine meadows or the crevices of rocks. A very few extend 

 down to sea level and several others are found occasionally be- 

 tween sea level and timber line. The soil at this elevation is 

 largely of a peaty nature but drier and witli less moss than the 

 Muskeg. Empetrum nigrum is still very abundant and members 

 of the Ericaceae are among the commonest forms. The following 

 list includes the species of this group so far as observed. 



Anemone narcissiflora Hieracium gracile 



Arctoranthis cooleyae Lupinus nootkatensis unalaskensis 



Artemisia borealis Lutkea pectinata 



Campanula sp. Lycopodium sitchensis 



Cassiope mertensiana Nephrophyllidium crista-galli 



Cladothamnus pyrolseflorus Pedicularis sp. 



Cryptogramma acrostichoides Phyllodoce glanduliflora 



Epilobium sp. Saxifraga spp. 



Erigeron sp. Sieversia calthifolia 



Gentiana sp. Tsuga mertensiana 



Harrimanella stclleriana Valeriana sitchensis 



