Excerpta Botanica. .345 



persistente accrescente stipatum. Ovarium (sub antlu^si iuovu- 

 hitiam, vix conspicuum, intus solidum) demum biloculare (nunc 

 3-loculare) (loculis contextu celluloso-carnoso omnino repletis), 

 limbo peria?ithi/io minuto marginiformi coronatum. Ovulu ana- 

 tropa, in quovis loculo solitaria, secus dissepiment! apicera ap- 

 pensa. Stigmata (sola pistilli jam sub anthesi pars rite evoluta) 

 2, exserta, liliformia, colorata, divergentia, marcescentia, basi 

 in stylum brevem confluentia. 



Involuc)-a fi-uctifera subcampaniformia v. tubulosa, nunc monophylla, 

 nunc 2- v. raro 3 -partita, segmentis v. limbo plus minusve aut 

 dentatis, autlaciniatis, foliacea(basi incrassatii, carnosa, rugosa), 

 monocarpa, ad apicem pedunculi incrassati (ramulum foliatum 

 plus minusve elongatum terminantis) solitaria, aut gemina, aut 

 plura (nunc fasciculata, nunc glomerata), bracteis multiformibus 

 involucrisque abortivis sti])ata. 



Nux subexserta v. involucre obtecta, istius fundo inserta, subcom- 

 pressa, v. obscure 3- v. 5-gona, v. subc3'lindrica, ossea, laevi- 

 gata, plus minusve striata, evalvis, obtusiuscula, ecoronata, 

 (limbo perianthino demiim subobsoleto), basi derasa, abortu 1- 

 locularis et 1-sperma, demiim sine involucro decidua. 



Semen nucis cavitati conforme, inadbBerens, crassum, exalbumino- 

 sum, dissepiment! reliquiis affixum. Integumentum tenue, 

 membranaceum, venosura. 



Embryo rectus, carnosus, oleosiis, albidus ; cotyledones magnse, co- 

 hserentes, plano-convexse, baud plicatse, subovales, basi et apice 

 rotundataB, germinatione hypogese ; radicula supera, brevis, co- 

 nica, obtusa, ex toto immersa. 



Arbores v. frutices duraosi. Gemmae disticlise, perulatse ; masculi- 

 floi'se aphyllse ; fceminiflorse simul foliigenae. Ramuli subcylin- 

 drici, flexuosi, epidermide subreticulati!ii rimuloso, mox deci- 

 duo. Folia 2-stipulata, disticha, breve petiolata, annotina, 

 tenuia, conspicue penninervia, j)licata, j)lus minusve rugosa, 

 dentata v. crenata simulque ssepius angulosa v. inciso-angulosa 

 (variatione nonnunquam pinnatilida), variiformia (in quovis in- 

 dividuo) basi ccquali v. iiiaequali, sa?pius cordata. Petiolus cy- 

 lindricus v. subtrigonus, ecanaliculatus. Stijiulse laterales, ca- 

 duca?, forina variabili. Amenta mascula elongata. Squamae 

 staminiferse luteo et fusco variegatse, sub anthesi laxiuscula^. 

 Anthera? virginea; purpurea, sub anthesi citrinse. Stigmata 

 purpurea. 



The genei'ic characters ascribed to Corylus, even in the 

 most recent works, are in many points more or less faulty. 

 Some authors regard the appendages of the staminiferous 

 scales in this genus as a perianth of two leaves adnate to the 

 scale ; but as these appendages also occur on the tloral scales 

 of the male catkins of the Betulaceoi, which, moreover, possess 

 a true pei-ianth, this view is manifestly incorrect. The num- 

 ber of stamens is variable and not constantly eight ; they are 

 inserted without any apparent order towards tlie base of the 



