3o6 The Ohio Naturalist. [Vol. V, No. 5, 



bevond the tendril. They are simple and coil in the usual man- 

 ner. In case of Smilax bona-nox there is a decided widening at 

 the base of the tendril; S. ecirrhata is usually without tendrils. 

 The following greenbriers occur in Ohio: 



1. Smilax herbacea L. .3. Smilax hispicia Muhl. 



2. " ecirrhata (Engelm) Wats. 6. " pseudo-China L. 



3. " glauca Walt. 7. " bona-nox L. 



4. " rotundifolia L. 



In our Raxun'CULace.-e the leaves are the climbing organs, 

 the petiole or petiolule is the sensitive part. In Clematis virgin- 

 iana there are cases showing the transition from leaf to tendril. 

 The leaflets drop off and leave the petiole presistent. There are 

 two species in Ohio: 

 8. Clematis virginiana L. 9. Clennatis viorna L. 



One of the Papaverace.^ has modified leaves which act as 

 tendrils. The petiolule is the sensitive part. The leaflets are very 

 much reduced often .showing a transition from ordinary leaf 

 parts to tendril. Our species is: 



10. Adlumia fungosa (Ait) Greene. 



The Fabace.^ which have tendrils belong to the pea tribe, 

 Vicieae. The ends of the leaves develop into tendrils which have 

 from two to five branches, except Lathyrus ochroleucus in which 

 the tendril is simple. The Ohio species are: 



11. Vicia cracca L. 17. Vicia angustifolia Roth. 



12. " amerlcana Muhl. 18. Lathyrus maritimus (L.) Bigel. 



13. " Carolina Walt. 19. " venosus Muhl. 



14. " tetrasperma (L.) Mtjench. 20. " palustris L. 



1.5. " hirsuta (L.) Koch. 21. " myrtifolius Muhl. 



10. " sativa (L.) 22. " ochroleucus Hook. 



In our species belonging to the Bigngniace.^ there are two 

 leaflets and one branched tendril coming from the end of the 

 presistent petiole. 



23. Bignonia crucigei-a L. 



The twig or shoot tendrils may represent ordinary branches 

 or modified parts of a flower cluster and as in the leaf tendrils 

 they may be either simple or branched. In Ohio are found four 

 families with seventeen species belonging to this division or group. 



In the climbing Sapixdace.-e two tendrils occur at the 

 base of the flower cluster. Our onlv species is the introduced: 



24. Cardiospermum halicacabum L. 



In the ViTACE.^ the tendrils appear on the twig opposite the 

 leaf. They are usuallv branched several times. In some cases 

 one of the branches of the tendril develops a rudimentary bunch 

 of grapes, or there may be a well developed l)unch of grapes with 

 a rudimentary tendril. In Ampelopsis cordata and most other 

 species of this family every third leaf node is without a tendril. 

 The Ohio s])ecies are: 



