1910] SCTTNEIDER 



81 



Man 



leaves broadly elliptic-ovate or obovate, mostly obtuse at apex; styles 

 1-1.5 mm. long: S. chlorophylla, and leaves oblanceolate, acute at both 

 ends, styles 0.5-1 mm. long: S. Nelsonii, I have been able to examine most 

 of the specimens enumerated by Ball, and I believe that almost all of the 

 Colorado specimens and Tweedy 's No. 47 from the Bigliorn Mountains in 



planifol 



But in 



specimens of A, Nelson and E. Nelson named by Ball S. Nelsonii I find 

 that the color of the one-year-old branchlets is more brownish red and not 

 chestnut colored as in S. planifolia and that the narrower lanceolate or 

 oblanceolate leaves very often show a rather distinct but fine glandular 

 crenulate denticulation. Their nervation is about the same as in S. plant- 



fol 



(1909) that the mature leaves are "rather 



strongly veined on both surfaces" applies as well to certain specimens of 

 S. planifolia. J. G. Jack collected at Centennial, Wyoming, at an altitude 

 of about 2700 m., on August 19, 1918 (Nos. 1068, 10G9, st.; A.; "bushes 

 6-8 ft. high, stems yellow or purplish green") good material of a form w4th 

 ovate-lanceolate or narrow-lanceolate (sometimes oblanceolate), rather acu- 

 minate leaves w^hich are more or less distinctly crenate-serrate, firm, and 

 prominently nerved beneath. This form, too, seems to represent typical 

 S, Xehonii w^hich, after all, may be regarded as another variety of S. plani- 

 a more closely connected with var. tyvica than with var. monica. There 



folia more closely connected with var. typica than with var. monica. 

 is no male material of S. Nelso7iii known, and before I dare express a defi- 

 nite opinion on it, I must study a larger set of specimens, and get a better 

 understanding of the forms of the Athabasca Region and the Northwest 

 Territories which I mentioned on p. 77. Some of these forms closely re- 

 semble S. Nelsonii which has been quite amply described by Ball, but he 



type 



eo 



glandular-denticulate stipules which are 2 to 4 mm. long. Jack's Nos. IOCS 

 and 10G9 show the same kind of stipules which become dry and fall off later. 

 All the forms of S, planifolia, and especially S. Nelsonii, need a careful 

 study in the field. Without having before me young material of both sexes 

 and mature leaves and fruits of the same individuals I am not able to decide 

 the taxonomic value of S. Nelsonii. There are some sterile specimens 

 which look much like S. monticola Bebb but may be referable to a form 

 like S. Nelsonii. I shall deal with them later. 



5. S, pennata Ball in Bot. Gaz. lx. 45, fig. 1 (1915); in Piper & Beattie, 

 Fl. Northwest Coast, 117 (1915). — S. chlorophylla Bebb in Bot. Gaz. xvi. 

 107 (1891), pro parte, non Andersson. — Piper in Contr. U.S. Nat. Herb. 

 IX. 216 (Fl. Wash.) (1906). — This rather rare and local species has been 

 amply described by Ball but he states that the filaments are ''glabrous,'' 

 while I find that they are distinctly but minutely pilose at base in all the 

 flowers I have examined. In this character S. pennata differs from all the 

 species included by me in this section to whxh it otherwise shows the 



