94 JOURNAL OF THE AYOLD ARBORETTM [vol. hi 



Amenta 1.2-3.5 cm. longa et ultra 5 mm. crassa; petioli saepissime 

 ultra 2 mm. longi. Vide formas diversas sub 48. S. anamesa, 47. 

 S. cordifolia et 46. S. glauca enumeratas. 



B. Flores glandula tantum unica (ventrali) instructi. 



a. Stamen unicum 

 Antherae violaceae; bracteae florum plusminusve distincte fuscescentes. 



111. S. sitchensis. 



Antherae aureae; bracteae florum flavescentes vel ad apicem flavo-brunneae. 



112. S. Coulteri. 



1). Stamina semper 2, filamentis interdum pro parte coalitis 



1. Filamenta basi plusminusve (interdum tantum parce) pilosa 



Bracteae florum flavae vel flavobrunneae vel interdum ad apicem satis rubro- 

 brunnescentes, satis breviter pilosae (pilis etiam ad apicem quam bractea 



brevioribus). 1 ) 

 Ramuli floriferi pruinosi vel amenta plusminusve coetanea et folia novella 



pilis etiam fulvis praedita 85. S. Geyeriana. 



Ramuli floriferi epruinosi: amenta plusminusve praecocia; folia novella tantum 



arg< nteo- vel griseo-pilosa 84. S. Bebbiana. 



Bracteae florum distincte bicolores, apice vel pro parte maxima fuscae, prae- 

 sertim ad apicem pilis bracteam aequilongis vel ea longioribus sericeis in- 



structae. 2 



Amenta coetanea vel satis serotina, pedunculis foliola normalia 2-5 gerentibus 

 suffulta, satis tenuia, vix ultra 1 cm. crassa. 3 

 Foliola pedunculorum semper margine dense minime glanduloso-denticulata. 



70. S. Eastwoodiae. 

 Foliola pedunculorum haud vel tantum versus basim sparse glanduloso- 

 denticulata 86. S. Lemmonii. 



71. S. or est era. 

 Amenta praecocia, sessilia vels ubsessilia, basi normaliter foliolis tantum squami- 

 formibus parvis paucis suffulta. 4 

 Amenta satis tenuia, anguste cylindrica, vix ad 1 cm. crassa. 



90. S. petiolaris. 



92. S. sericea. 



Amenta satis crassa, saepe ovoideo- vel ellipsoideo-cylindrica, 1-1.5 cm. 



crassa. 



Hamuli floriferi leviter pruinosi .... 86. S. Lemmonii var. Austinae* 



Hamuli nunquam pruinosi. Confer 95. S. discolorem et 96. S. Scoulerianam 



et species mexicanas 97. 8. paradoxam et 98. S. oxylepidem. 



2. Filamenta semper omnino glaberrima. 5 



Folia subtus discoloria. 



Folia circumcirca dense et minute glanduloso-serrata. . 63. S. Cliamissonis. 

 Folia integerrima vel versus basim tantum sparse denticulata. 89. S. fuscescens. 



1 Of the very ran; Californian 109. S. Breweri the bracts are also yellowish but their 

 pubescence consists of long thin sericeous hairs and the gland is remarkably slender 

 and more than half as iong as the bract. 



2 The very little known Mexican 115. S. carta has fuscous bracts with a very short 



imbescence, small coetaneous ellipsoidal aments, more or less tomentose branches and 

 inear-lanceolate leaves. Of the apparently very closely related 116. S. Endlichii 



with glabrous branchlets 1 have not yet seen material. The male plant of 91. S. co- 

 actilis from Maine is still very little known; it seems to have violet anthers. 



3 Of 77. S. amplifolia the filaments are sometimes slightly pilose at base. This 

 species has large aments measuring up to 6.5: 1.7 cm. 



4 Of the rare 103. S. pennata from Washington and Oregon the filaments possess 

 only very few hairs at their base. Sometimes also the filaments of 9. S. Piperi show 

 a few hairs. Both have glabrous purpurascent rather shining flowering branches. 



•'The determination of the male plants of the following species is often a very dif- 

 ficult task owing partly to the precociousness of the aments and the great similarity 

 as a whole of the male flowers. It mostly needs a careful comparison of a well-col- 

 lected series of flowering specimens of each species to thoroughly establish the differ- 

 ences between them without the aid of the leaves. 



