Excerpta Botanica. 345 



persistente accrescente stipatum. Ovarium (sub anthesi inovu- 

 latum, vix conspicuum, intus solidum) deraum triloculare (nunc 

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

 limbo perianthino minuto marginiformi coronatum. Ovula ana- 

 tropa, in quovis loculo solitaria, secus dissepimenti apicem ap- 

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

 2, exserta, filiformia, colorata, divergentia, marcescentia, basi 

 in stylum brevem confluentia. 



Involucrafructifera subcampaniformia v. tubulosa, nunc monophylla, 

 nunc 2- v. rar6 3-partita, segmentis v. limbo plus minusve aut 

 dentatis, aut laciniatis, foliacea (basi incrassata, 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 stipata. 



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

 pressa, v. obscure 3- v. 5-gona, v. subcylindrica, 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, inadhaerens, crassum, exalbumino- 

 sum, dissepimenti reliquiis affixum. Integumentum tenue, 

 membranaceum, venosum. 



Embryo rectus, carnosus, oleosus, albidus ; cotyledones magnae, co- 

 haerentes, piano- convexae, haud plicatae, subovales, basi et apice 

 rotundatae, germinatione hypogeae ; radicula supera, brevis, co- 

 nica, obtusa, ex toto immersa. 



Arbores v. frutices dumosi. Gemmae distichae, perulatae ; masculi- 

 florae aphyllae ; fceminiflorae simul foliigenae. Ramuli subcylin- 

 drici, flexuosi, epidermide subreticulatim rimuloso, mox deci- 

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

 tenuia, conspicue penninervia, plicata, plus minusve rugosa, 

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

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

 dividuo) basi aequali v. inaequali, saepius cordata. Petiolus cy- 

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

 ducae, forma variabili. Amenta mascula elongata. Squamae 

 staminiferae luteo et fusco variegatae, sub anthesi laxiusculae. 

 Antherae virgineae purpureae, sub anthesi citrinae. Stigmata 

 purpurea. 



The generic 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 floral scales 

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

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

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

 inserted without any apparent order towards the base of the 



