186 JOURNAL OF THE ARNOLD ARBORETUM [vol. ii 



CLAVIS SPECIERUM 



Folia subtus discoloria, distincte pallidiora vel glauccscentia. 



Rauuili floriferi pruinosi; pcdicclli 0.8-1 (rarius ad 1.5) mm. longi 54. S. irrorata. 



Ramuli niinquam pruinosi. 



Ramuli annotinl biennesque phismimisvc rastanei, fiiscescontos, sordidc brunncs- 

 centc^ vel subviridescentcs vel tomontcUi. 



.Pedicclli friictuum vix ultra 2 (-2.5) mm. longi vol ramuli etiam fructiferi satis 

 tomcntosi. 



ruhoscontia foliorum saltcm juvenilium pilis griseis et fulvis mixta; folia 

 lanceoliita, oblanceolata ad oblongo- (rarius obovato-)lanren]ata, apice 

 obtusa vel brevitor acuta, l)asi cuncata vel sensim attenuata, supcrne baud 

 stomatifera; amenta plerafpie -sessilia, dense eylindriea; bracteae ubovatao, 

 praesertim extus dense breviter serieeo-suberispo-pilosae. .55. S. lasiolcpis, 

 Pubescentia grisca vel folia diversa. 



Ramuli etiam floriferi distinete tomenlosi vel pubeseentes; folia satis 

 laiH'eolata vel anguste laneeolata, versus apieem saepi.ssime plusminusve 

 sensim acuminata; amenta fruetifera ad 7-10 cm. louga et 2 cm. crassa; 

 fruetus 8-10 mm. et pedicelli interdum fere ad 3 mm. longi. 



. . 58. S, missouricnsis* 



Ramuli floriferi glabri; f met us vix ultra G-7 mm. longi vel plantae aliis 

 signis diversae. 



Folia supcrne ut videtur semper stomatifera, margine dentata vel 



subintegra 5(;. s. Hgulifolia. 



Foha supernc baud stomatifera, margine saepissime serrata vel serrate- 



dentata 57. .s. cordata. 



Pedicelli fructuum (2.5-)3-4 mm. longi 50. S. mackcnzicana. 



Ramuli annotini biennesque plusminusive hitescentes vel flavescentes; pedicelli 



1.5-3 mm. longi (;0^ ^-^ i^^^^j^ 



Folia utrinque concoloriit, etiam subtus viridia vel distinete viridescentia. 



Folia apice distincte acuta vel acuminata, dentata, serrata vel subintegra; petioli (4-) 

 6-11- ram. longi. 



Pedicclli 2.5-4 mm. longi; folia etiam matura satis membranaeea. 01. S. monochroma, 

 Pedicelli 1-1.75 (rarus ad 2.25) mm. longi; folia matura satis cbartacea 



-, .. . 03. S. pscudocordata, 



roha apice obtusa vel ^^ubaeuta, crenato-dcntata vel crenata; petioli vix ultra 3-4 mm. 



'^"S' 02. S. myrlilUfoHa. 



ENUMERATIO SPECIERUM 



54. S. irrorata Aiidersson in Of v. Svensk. Vet.-Akad. Forh. xv. 117 

 (1858); in Proc. Am. Acad, iv, 57 (Sal. Bor.-Am. 11) (1858); in Walpers, 

 Ann. Bot. v. 746 (1858); in De Candolle, Prodr. xvi.^ 26^2 (18G8). — Bebb 

 apud Coulter k Nelson, Man.'Rorky Mts. Bot. 330 (1885). — Rydberg, 

 Fl Colo. 95 (190G); Fl Rocky INIts. 194 (1017).— Ball apiid Coulter 

 & Nelson, New Man. Rocky Mts. Bot. 132 (1909). — Wooton & Standley 

 in Contrib. U. S. Nat. Herb. xix. 159 (Fl. New Mex.) (1915). — This well 

 characterized WilloAV has been described by Andersson from specijuens 

 collected by Fcndler (No. 812) in New Mexico, Santa Fe County, Santa 

 Fe Creek, bottom of the creek, exposed to innun<lations, on January IG, 

 1847. I have seen the type and several cotypes. In 1858, Andersson 

 stated that this species to the European '*>S. daphnoidi ita est siniilis, ut 

 nuUis notis nisi amentis exiniie condensatis et foliis (novellis!) integerrimis 

 utrinque viridibus ab ea distingui possit"; but later, in 18G8, he more 

 correctly said "maxhnam cum S. daphnoide habet affinitatem, sed dis- 

 tinguitur amentis condensatis, gemmis rotundatis, sfpiamis obtusis,' 

 capsuHs minoribus distincte pedicellatis stylo breviori apiculatis. . ." 

 After all, S. daphnoides belongs to a very different group not represented 



