326 BOTANICAL GAZETTE [april 



aments are oblong, the capsules lanceolate and villous We perceive 



no affinity that this species bears, except perhaps to the 5. angustifolia of the 

 borders of the Caspian, from which at the same time it is probably very distinct. 



Nuttall's statements indicate that the main character of S. 

 argophylla is the soft, villous, white pubescence which is also a char- 

 acteristic of S. sessilifolia and S. macrostachya. He does not indi- 

 cate the shape of the stigmas, owing probably to the fact that he 

 collected only plants with mature capsules. The type locality is 

 ''one of the branches of the Oregon [Columbia], the river Boisee, 

 toward its junction with the Shoshonee" [Snake River] in western 

 Idaho, Canyon County. So far as I know there is no type in exist- 

 ence, but Nelson and Machride's no. 1057 and Machride's no. 228 

 from the same county seem identical with Nuttall's species. 

 Andersson mentioned it first in his monograph in 1867 as follows: 



"5. longifolia **argyrophylla: (Nutt. Sylva Amer. p. 87 ?) : foliis et capsulis 

 tomento argenteo tomentoso-micantibus. — In regionibus meridionalibus, ut 

 in Mexico, etc.," and he adds a forma "angustissima: foliis anguste linearibus." 

 "Hab. in ripis in Cahfornia (Fremont); Rocky Mountains (Nuttall)," giving 

 as a synonym "S. brachycarpa Nutt. Amer. Sylva p. 85 ?. " 



In the Prodromus (1868) Andersson cites under his S. longifolia, 

 argyrophylla Berlandier^s no. 2371 (recte 2341) and WrigMs no. 

 1873, and adds a forma opaca. He certainly misunderstood 

 Nuttall's species entirely, and owing to the changed spelling of the 

 name we may regard his var. argyrophylla as quite a new form which 

 has nothing at all to do with S. argophylla. For a further explana- 

 tion of Andersson's plant see under S. longifolia var. angustissima. 

 S. longifolia argyrophylla of Bebb and other authors as well as S. 

 fluviatilis argyrophylla Sargent are names applied to forms of very 

 different origin, and may sometimes include the true S. argophylla, 

 but mostly seem to refer to S. longifolia var. Wheeleri. Rowlee 

 (1900) mixed with it S. Hindsiana Benth. and also forms which 

 belong to S. exigua and 5. sessilifolia leucodendroides . Piper 

 (1906) and Ball (in different herbaria) referred the forms I take 

 for S. argophylla mostly to S. macrostachya, but Nuttall's type 

 of this species belongs to S. sessilifolia, as previously explained. 



Male or sterile specimens of S. argophylla are not always easily 

 separated from S. sessilifolia, as for instance those collected by 



