352 Eixerpta Botanica, 



Sectio II. TUBO-A^'ELLANA, Spach. 



Involucrum fruct'iferum inerme, monophylbnn, ultra nucem m tubiini 

 nunc bijid am, nunc trifidum, 7iunc uno latere tantum fissum, ore 

 clausum, apice dentatum v. laciniatum productum, 



3. CORYLUS TUBULOSA,Willd. Guimp.et Hayn.Deutsch. Holz. 

 tab. 152. — Coryhs inaxima. Mill. — Corylus arborescens, Duroi ; 

 Moench. — Corylus rubra, Borkh. — Noisetier franc, Poit. etTurp. 

 Arbres fruitiers, tab. 12. Fruticosa, dumosa, v. rarius sub- 

 arborescens. Cortice laevigato v. demum rimoso nunquam de- 

 ciduo. Foliis ssepius subrotundis v. ovato-subrotuudis. Invo- 

 lucris-fructiferis conoideis, nucibus nunc paulo, nunc subdimidio 

 longioribus. 

 H(ib. in Austria, Hungaria, Italia superiori (Reicb. Fl. Germ, ex- 

 curs.), nee non in austi-alioribus Europe regionibus. 



ft. pu)-purea. — Corylus tubulosa purpurea, Audib. Cat. — Corylus 



purpurea, Hortul. Foliis involucrisque purpureo-fuscis. Va- 

 rietas hortensis. 



The C. tubulosa, known under the name of the true Filbert 

 [Xoisetier franc), has been considered by many authors as 

 only a variety of C. Avellana ; but it appears to us incontest- 

 ably distinct, from the structure of its involucre, although we 

 have been utterly unable to discover other differences between 

 these two species. The leaves and stipules vary as in V. Avel- 

 lana. The fructiferous involucre is 1^ — 2 inches long, downy 

 or hispid, generally glandular, sometimes hi- or trifid, some- 

 times divided on one side only, and m-egularly inciso-dentate 

 or laciniated at the summit. Nut oblong, or oval-oblong, or 

 oval, more or less compressed, sometimes violet, sometimes of 

 a brown-red colour. The integument of the seed is purple 

 or white. 



4. CORYLUS ROSTRATA, Hort. Kew. ; Willd. Arb. tab. 1. fig. 2. 

 Corylus americana, Walt. Carol. — Corylus cornuta, Duroi. Fruti- 

 cosa, pumila. Foliis ssepitis oblongis v. oblongo-obovatis, du- 

 plicato-serrulatis (vix aut ne vix angulosis). Involucro-fructi- 

 fero basi subgloboso, superne longe cylindraceo-tubuloso, nuce 

 multu longiore, ssepius hispidissimo. (V. s. sp.) 

 Hab. in Americse septentrionalis montibus Alleghanies. 



This species, according to the authors of the ' Flora of 

 North America,' does not rise to more than three or four feet. 

 The leaves are much smaller than those of the preceding 

 species, slightly cordiform at the base. The tube of the 

 fructiferous involucre is in length about eighteen lines, 

 slender, ordinarily bifid as far as the middle, with laciniate 

 segments. 



