404 CLIX. CUPULIFER^. [Betule(e. 



TitiBUS I. Betule^. 



r 



1. Betula, Limu Gen. n. 1052, pro parte.— Florea monoici, ^ in spicis amentaceis 

 pendulis squamoso -bract eat is, sub quaque squama s?epius 3. BracteolfB intra squamam cui 

 basi adnatse 2, collaterales. Perianthia sessilia, membranacea, in segnienta 4 v. abortu 

 pauciora divisa ; segmentnm anticum ovatum antheris oequilongum, cetera saepius minima 

 V. abortiva. Stamina 2, anticum et posticum, filamentis brevissimis ; antherie ovatse, loculis 

 erectis parallelis discretis, ad apicem filamenti brevissime stipitatis. Ovarii rudimentum 

 0. Mores $ in spicis cylindraceis erectis dense imbricato-bracteatis, sub quaque bractea 

 ssepius 3. Bracteolse intra squamam 2, collaterales. Perianthium 0. Ovarium nudum, 

 sessile, plano-compressum, 2-loculaTe ; styli 2, cyiindracei, tenues, apice stigmatosi ; ovula 

 in loculis solitaria, sub apice affixa, micropyle supera. Spic.^ fructiferaj cylindraceje, in- 

 crassatfe, bracteis cum bracteolis in squamam'3-fidam connatis, cum fructibus deciduia. 

 Nuces parvse, compressse, anguste v. late bialatse, stylis persistentibus sjepius coronate, 

 ante casum bractearum in spica inclusse ; exocarpium tenue, endocarpium crustaceum v. 

 leviter induratum. Semen abortu unicum, pendulum, testa membranacea ; cotyledones 

 planse, radicula brevi supera. —Arbores fruticesve. Folia altema, dentata v. serrata, 

 rarius incisa, pennivenia. Spicse terminales v. axillares, ssepe ramulum brevissimum 1-2- 

 foliatiim axillarem terminantes, solitarise v. ^ ssepe ? in speciebus perpaucis, 2-4 sub- 

 racemosie. 



Species ad 25, per Europ^m, Asiara mediam et borealem, et Americam boreaiem late dispersai. 

 Kegel, Monogr. Beiul. in Mem. Soc. Imp. Nat. Mosc. xiii. 9, t. 1 ad 13, in BidL Soc. Imp. Nat. Mosc. 

 1865, ii. t. 6 ad S, et in DC. Prod. xvi. ii. 162. Gartn. Frmt. ii. i. 90. Nees, Gen. Fl, Germ. 

 MonocJil n. 18. Jlcichh. Ic. FL Germ. t. 621 ad Q21. Jacq. Hort. Vind. t 122. Wats. Dendrol. 

 BriL t 94. 95, 97, 144. 151 ad 154. Pall. Fl. Ross. t. 39. 40. Trautv. Imag. Fl. Ptoss. t. 5. et in 

 Middcnd. Hcise, Bot. t. 21. Bene, in Jacquem. Voy. Bot. t. 158. Brandis, For. Fl. t. 6Q. Mich. 

 Arh. Amcr. Sept. ii. t. 1 ad 5. mut. N. Amer. Sylv. t. 7, 8. Torr. Fl. N. Yor/c, if 112 at? 114 S 

 Wats. Bot. U. S. 40 Parall. t. 35. ' ' 



Betuiaster^ Spach in Ann. So. Nat. ser. 2, xy. 198, genus propositum fuit ad B. acuminafam 

 Wall. 11. As. Ear. 1. 109 (cm includonda^ B. cylindrostachys. Wall., et B. nitida, Don), spicis ? sa^pius 

 2-4-nis, et fractus alis .squamas strobili Buperantibus, charaeteres tameu levioris momenti et vix 

 constantes, nam spic^ ? s^pe geiuina; in B. Bhojpattra, Wall., et al^ fructus quoad latitudinem in 

 piTinbus speciebus variant. Kegel genus Spachianum pro sectione admisit addita B. Maximo- 

 k'lcziana, Eeg, e Japonia. Haec species gpicas ? 4-nas exhibet sed alse fructus squamis strobili 

 insjgniter breviores. 



2. Alnus, Gartn. Frnct. ii. 54, t OO.-Flores monoici, ^ in spicis amentaceis pendulis 

 squamoso-bracteatis, sub quaque bractea sicpius 3. Bracteob^ intra squamam cui basi 

 affixPB 3-5. Perianthia sessilia, 4-partita, segmentis fequalibiis leviter imbricatis anthcras 

 a^quantibus v. injequalibus plerisque minute squamiformibus. Stamina 4, filamentis 

 brevissimis ; anther^e ovatte, loculis distinctis parallelis supra basin connective minutf> 

 affixce. Ovarii rudimentum 0. Flores 5 in spica cylindracea v. oblonga imbricato- 

 squamata sub quaque bractea siepius 2. Bracteolfo intra squamam 2-4, minutte. Peri- 

 anthium 0. Ovarium nudum, sessile, plano-compressum, 2-loculare ; styli 2, cyiindracei, 

 breves, apice stigmatosi ; ovula in lociUis solitaria, sub apice lateraliter affixa, micropylo 

 supera. Spicffi fructiferre incrassatm, ovoidese v. breviter cylindracea^, squamis auctis in- 

 duratis lignosis post nuces delapsas persistentibus, primum dense imbricatis, maturitate 

 patentibus apcrtis. Nuces parvse, compressas, bialatse v. nud* ; exocarpium tenue ; 

 endocarpium crustaceum. Semen abortu unicum, pendulum, testa membranacea ; cotyle- 

 dones planse, radicula brovi supera.— Arbores fruticesve. Folia alterna, decidua, 

 pennivenia, serrata v. rarius integerrima. Spicae d* et $ e gemmis distinctis sfepius 3-oo, 

 racemosrc, hieme v. jam autumno prsecedente ad axillas foliorum formatfe, primo vere 

 ante fohorum evolutionem florentes v. rarius foliis novollis coetaneie, tempus tamen 

 evolutionis non semper in eadem specie constans. 



Species ad U, per Europam, Asiam mediam et borealem, Americam borcatem et Andes Americas 



