1921] SCHNEIDER, NOTES ON AMERICAN WILLOWS, XII. 101 



Stigmata linearia elongata, stylo tenui satis longo plusminusve 2-3-plo 

 breviora; ovaria fructusque saepe ad apicem tan turn pilosi. 



36a. S. stolonifera f . subpilosa. 



Stigmata brevia vel oblonga vel styli iis distincte breviores. 



Folia subtus (in sicco) paullo pallidiora (haud distincte glaucescentia 

 vel albescentia), leviter elevato-nervata sed vix reticulata, saepissime 

 lanceolata vel elliptico-lanceolata, utrinque acuta vel apice obtusa, 

 superne stomatifera, etiam maxima vix ad 4:1.8 cm. magna, fere sem- 

 per integerrima; fruticulus ramulis hornotinis flavescentibus tenuibus 

 satis brevibus 32. S. petrophila. 



Folia subtus distincte glaucescentia, pruinosa, superne baud stomatifera 

 vel diversiform ia vel plantae aliis signis diversae (confer clavem in 

 Bot. Gaz. LXVII, 32). 

 Glandula ventralis satis brevis et lata, vix duplo altior quam crassa, 

 apice late truncata, pedicellis fructuum duplo breviores; amenta 

 submatura et fructifera 5-10 :1.2— 1.6 cm. magna; fructus pedicello 

 excluso 6.5-8 mm. longi; folia superne estomatifera, nitidula, saepe 

 obsolete denticulata (confer etiam 38. S. hudsonensem, speciem raram 



incomplete cognitam) 37. S. arctophila. 



Glandula oblonga pleraque 2>£-4-plo longiora quam crassa et pedi- 

 celli fructuum glandula breviores vel rarius sublongiores vel plantae 

 aliis signis diversae. 

 Amenta fructifera ellipsoideo-globosa, circiter 1-1.5 :1.5 cm. magna; 

 folia subcoriacea, vix ultra 1.8:1.5 cm. magna, superne estomati- 

 fera, subtus elevato-reticulata, utrinque saltern initio ut ramuli 



novelli villosula 35b. S. ovalifolia var. pubescens. 



Amenta fructifera cylindrica longiora; folia tenuia vel majora, sub- 

 tus baud conspicue elevato-reticulata (confer etiam 89b. S. 

 fuscescens var. hebecarpam pedicello saepe tantum piloso brac- 

 teae parvae plerumque parce pilosae siibaequilongo distinc- 

 tam). 

 Folia superne haud stomatifera; petioli 9-20 mm. longi; amenta 

 fructifera 6:1.3 ad 9:1.8 cm. magna; fructus pedicello brevi 



excluso (6-)8-10 mm. longi 34. S. arctica. 



Folia superne stomatifera; petioli vix ad 10 mm. longi; amenta 

 fructifera vix ad 5.5 : 1.5-1.8 cm. magna; fructus 7-8 mm. pedi- 

 cello brevi excluso longi 33. S. anglorum. 



Bracteae concolores, stramineae vel flavescentes vel laete brunnescentes, 

 satis brevipilosae (pilis bractea brevioribus) , intus interdum glabratae. 



Confer formas parvas plusminusve prostratas 47. S. cordifoliae et species 

 raras incomplete cognitas 39. S. fuller tonensem et 49. S. lingulatam. 



2. Frutices erecti vel arbusculi, ramis nunquam repentibus et radicaritibus; 

 amenta praecocia vel coetanca; folia sub anthesi hand vel vix semi- 

 evoluta. 



a Ovaria (pedicellique) etiam juvenilia glaberrima .(/} vide p. 103). 



* Pedicelli distincti, etiam sub anthesi 1 glandulam 2-plo usque 6-plo super- 

 antes; styli (stigmataque) breves 2 ). (**, vide p. 102). 

 Bracteae concolores flavescentes vel flavo-brunnescentes, in vivo interdum paullo 

 rubescentes, in sicco saepe brunnescentes; amenta coetanea, etiam florifera 



peduneulo foliolato suffulta. 

 Foliola foliaque utrinque viridia, (saltern superne) pubescentia et stomatifera; 



pedicelli ad 1.8 mm. longi, glandulam vix ultra 2>£-plo superantes. 



69. S. ccmmutata. 



Foliola foliaque subtus discoloria, plusminusve glaucescentia vel folia superne 



glabra estomatifera et pedicelli sub fructu ultra 3 mm. longi. 



1 "Sub anthesi" refers to fully developed flowers of which the stigmas and the glands 

 are not yet withered. Later when the fruits begin to ripen or are quite matured the 

 size and shape of the stigmas and of the gland usually changes more or less by wither- 

 ing. If the flowers are too young the pedicels mostly are shorter. 



2 The styles are "short" if they are almost wanting or not longer than from 0.5 to 

 1 (or hardly 1.25) mm.; the stigmas may be of equal length or hardly half as long. 



