1919] SCHNEIDER— AMERICAN WILLOWS 33 



matibus oblongis bifidis paullo vel duplo 

 (rarius fere triple) longiores; fructus pedi- 

 cello excluso 6.5-8 mm. longi; folia superne 

 estomatifera, margine vulgo partim sparse et 

 saepe obsolete denticulata, forma variabilia, 

 majora latiora ad 3-4 (-5) : 2. 5 (-3) cm. 

 magna; frutex procumbens ramulis saepe 

 satis elongatis, 2-3 mm. crassis (si glandula 

 est brevis et lata sed pedicello brevior, confer 



i8a. S. hudsonensem) 18. S. arctophila 



Glandula oblonga, vulgo 2^-4plo longior 

 quam lata et pedicelli etiam fructuum quam 

 glandula pl.m. breviores vel rarius sublongi- 

 ores vel plantae aliis signis diversae. 



Amenta fructifera ellipsoideo-globosa, circ. 

 1-1.5:1.5 cm. magna; folia subcoriacea, 

 late ovalia vel obovato-rotunda, vix ultra 

 1.8:1.5 cm. magna, superne estomatifera, 

 in sicco tenuiter reticulata, subtus valde 

 elevato-reticulata, utrinque (saltem initio) 

 ut ramuli novelli villosula 



1 6b. S. ovalifolia var. puhescens 

 Amenta fructifera cylindrica, vulgo longi- 

 ora, tenuiora; folia tenuiora vel majora, 

 subtus nunquam conspicue elevato- 

 reticulata. 



Folia superne baud stomatifera,^ vulgo 

 obovata vel obovato-oblonga, apice 

 rotundata ad subacuta vel plicato- 

 acuta, basi sensim vel subito attenuata, 

 obtusa vel interdum rotundata, majora 

 satis evoluta 3-6:2-4 cm. magna; petioli 

 9-20 mm. longi; stipulae in ramulis 

 vegetis ovato-lanceolatae vel lanceolatae, 



3 With the exception of 5. arctica var. suhcordata, which, however, is easily dis- 

 tinguished from any of the forms of S. anglorum by its much larger leaves and longer 

 stouter catkins. 



