BETULACEAE. — ALNTJS 491 



minusve connatae; bracteae fructiferae extus apice lobi mediani 



clare bninneae, quasi umbonatae 10. A. formosana. 



Folia satis remote breviter denticulato-serrata v. repando-scrrata v. 

 Eubintegra. Ramuli novelli griseo-puberuli. Bracteae florum ovato- 

 triangiilares, acutae; thecae antherarum separatae; bracteae fructi- 

 ferae extus apice concoloria, baud punctata 11. A. nitida. 



Amenta masculina numerosa, apice ramulorum florifcronim paniculato- 

 racemosa, autumno florentia, longissima et tenuia. Semina alis distinctis 



hyalinis cincta Sect. 2. CLETIIROPSIS. 



12. A. nepalensis. 



Gemmae sessiles v. subscssilea, acuminatae, perulis exterioribus 3-6 v. intcrdum 



tantum 2 inaequalibus obtectae. Amenta feminea racemosa, baud ante 



verem apice ramuli brevis novelli paucifoliati terminalia; semina alis mem- 



branaceis distinctis nuculo saepe aequilatis v. sublatioribus cincta. 



Subgen. III. ALNASTER. 



Folia late ovata, ovato-elliptica v. ovato-rotunda, apice obtusa v. subito 



breviter acuminata, pleraque versus medium latissima, margine dentibus 



patentibus argute serrulata, nervis lateralibus utrinque 5-10("12). Pro- 



phylladichasiorummasculinorum bracteam margine plus minusve super- 



antia. Frutices Series a. Virides. 



Folia apice sensim breviter acuta v. subobtusa, basi pleraque cuncata v. ro- 

 tundata. Ramuli annotinipurpurascentes v. brunnescentes. Bracteae 

 mediae florum masculinorum dorso distincte umbonatae.* 

 Petala florum masculinorum stamlnibus longiora; stamina saepissime 

 antheris aequilonga; thecae antherarum toto longitudine connatae. 



13. A.fruticosa. 



Petala florum masculinorum staminibus breviora; stamina antheris dis- 

 tincte longiora; thecae antherarum basi apiceque liberae, plus minusve 



divaricatae 14. A. sinuata^ var. kamischatica. 



Folia apice saepissime subito breviter acuminata, late ovata v. ovato- 

 rotunda, basi late truncata v. cordata. Ramuli annotini grisei v. griseo- 

 brunnei. Bracteae mediae florum masculinorum dorso baud umbonatae; 



thecae antherarum basi apiceque liberae, divaricatae. 



15. A. Maximowiczii. 



Folia ovato-oblonga v, ovato-lanceolata, versus apicem sensim longe acumi- 

 nata, versus basim latissima, margine arjicute serrulata dentibus subad- 

 pressis, nervis lateralibus 12-27. Prophylla dichasiorum masculinorum 

 parva, basi interiore bracteae occulta. Frutices v. pleraeqtie arborea 

 parvae Series b. Firmae. 



Nervi laterales utrinque 12-17; petioli foliorum majorum 1-2 cm. longi. 

 Amenta fructifera crassa, haudpendula; strobili 1-2, majores 1.8-2.5 cm, 

 longi et circiter 1.3-1.5 cm. crassi 16. A.firma, 



Nervi laterales utrinque plerique lS-27; petioli foliorum etiam maximo- 

 rum vix 0.8 cm. longi. Amenta fructifera gracilia, nutantia v. subpen- 

 dentia; strobili 2-5, etiam maxima vix ad 1.5: 1 cm. magna. 



17. A. pendula, 



^ * fide Callier; in speciminibua a me visis ex Ajan Ig. H, Tiling, umbonem dis- 

 tinctum non vidi. 



