28 WILSON EXPEDITION TO CHINA 



saepe ciliata, radicalia (teste Fischer) saepe lanceolata, utrinque acu- 

 minata, plantae juvenilis elliptica, basi acuta, apice plus minusve 

 acuminata, v. ovato-elliptica, basi subrotunda, 5 : 2.5-9 : 4.5 cm. magna, 

 plantae maturae pleraque ovata v. late ovata, basi rotunda, raro 

 subcordata, apice acuminata v. acuta, 5.5 : 3.5-1 : 6.5 cm. magna, 

 in plantis cultis etiam majora, cordato-ovata, ad 18:14 cm. magna; 

 petioli semper satis longi (turionum paullo breviores), 1.5-5 cm. longi. 

 Amenta mascula 4-5 cm. longa (teste Maximowicz), fructifera ad 

 13 cm. longa, parce puberula v. glabra, capsulis satis approximatis, 

 sessilibus v. subsessilibus, ovoideis, glabris (in var. Przewalskii pubes- 

 centibus maturis glabratis), trivalvibus nondum apertis circiter 



7 : 5 mm. magnis 7. P. suaveolens. 



Ramuli initio ut videtur plus minusve rubescentes, deinde olivacei, 

 vetustiores cinereo-flavi, v. cinerei, plus minusve dense puberuli v. 

 pubescentes sed interdum satis glabri. Folia papyracea v. saepissime 

 subcoriacea, supra intense v. livide viridia, opaca, tota facie v. tan- 

 tum nervis puberula, raro glabrescentia, rete nervorum angusta, 

 distincta, subtus valde discoloria, albescentia v. saepissime rubello- 

 flavescentia, margine glanduloso-crenulata, plus minusve ciliata, 

 radicalia non visa, cetera inter se satis conformia, pleraque elliptica, 

 v. ovato-elliptica, basi subcordata, apice breviter oblique acuminata 

 v. acuta, interdum elliptico-rotunda, apice obtusa, 6.5 : 3-12 : 9 cm. 

 magna; petioli 1-4 cm. longi, valde (v. raro vix) puberuli. Amenta 

 mascula 5-10 cm. longa, antheris 30-40; feminea initio 3.5-5 cm., 

 fructifera ad 18(-25) cm. longa, breviter tomentella, puberula v. plus 

 minusve glabra, ovariis glabris, capsulis sessilibus v. subsessilibus 

 subglobosis, nondum apertis circ. 8-9 : 7-8 mm. magnis, 3-4-valvibus. 



8. P. Maximowiczii. 

 Ramuli juveniles turionesque distincte angulati v. biennes striati. 



Folia turionum (et pleraque ramulorum) infra medium latissima, lance- 

 olata, elliptica, ovata v. cordata (baud distincte obovata) (confer 

 etiam 10. P. yunnanensem et 11. P. Gamblei). 

 Ramuli florif eri tereti vel subtereti (hand distincte angulati), olivaceo- 

 brunnei v. ochroleuci (baud pallido-flavi v. grisei). 



9. P. szechuanica. 

 Ramuli etiam fioriferi satis angulati, pallido-flavi v. grisei. 



12. P. lauriJoUa. 



Folia turionum supra medium latissima, saepissime distincte obovalia, 



basi plus minusve cuneata v. rotunda, apice obtusa sed pleraque in 



acumen plus minusve longmn producta 13. P. Simonii. 



** Folia subtus concoloria viridescentia v. discoloria et glaucescentia, non albes- 

 centia sed interdvun tomento albo obtecta. 

 t Folia subtus plus minusve concoloria, viridescentia, utrinque stomatibus 

 numerosis praedita, turionum ramulorumque vetustiorum vix v. paullo 

 diversa, deltoidea, basi truncata, apice plus minusve acuminata. Gem- 

 mae viscosae Sect. 4. AIGEIROS. 



Folia parva obovata v. ovato-deltoidea, basi plus minusve longe cuneata, 

 apice breviter acmninata, supra medium crenato-denticulata v. sub- 

 serrata, 1.4-4 cm. longa et 1.2-2 cm. lata, initio margine ciliolata et 

 subtus parce puberula; petioli graciles, ut videtur non compressi, initio 



puberuli, 0.3-2 cm. longi 14. P. afghanica. 



Folia majora, turionum late subcordato-triangularia, apice subito in 



