i8o 



The Ohio Naturalist. 



[Vol. VII, No. 8, 



Corylus americana (Fig. 12) has glandular emergences of the 

 multi-cellular type. The stalks show from five to ten rows of 

 cells on one side and the glandular heads are also multi-cellular. 

 Cypripedium reginae (Fig. 11) has multi-cellular glandular hairs 

 consisting of three stalk cells and a head cell. The basal cell 

 is rather large and extends below the surface of the epidermis. 

 The top or head cell is enlarged and rounded in shape with a slight 

 depression on the top. The four cells each show large nuclei 

 and the head cell is filled with granular cytoplasm. Juglans 

 has glandular hairs which have multi-cellular heads. The cells 

 are formed by longitudinal divisions and a plate of cells is formed. 

 The stinging hairs of Urtica dioica (Fig. 10) are glandular, but 

 of a difi:erent type. The hair consists of an enlarged multi- 

 cellular base and a single-celled top. This hair gives our formic 

 acid on being broken. 



The following lists represent the Ohio plants having the var- 

 ious types of glands considered: 



Punctate Leaves. 



Polygonum incarnatum Ell. 



" lapathifolium L. 



" pennsylvanicum L. 



" persicaria L. 



" careyi Olney. 



" hydropiperoidesMichx. 



" hydropiper L. 



" punctatuni Ell. 



" virginianuni L. 



" scandens L. 



" sagittatum L. 



" arifolium L. 



Amaranthus hybridus L. 



" retrofle.xus L. 



" spinosus L. 



blitoides S. Wats. 



" graecizans L. 



Acnida tamariscina tuberculata 



(Moq.) Uline and Bray. 

 Magnolia acuminata L. 

 Liriodendron tulipifera L. 

 Caltha palustris L. 

 Psoralea pedunculata (Mill.) Vail. 

 Psoralea onobrychis Nutt. 

 Amorpha fruticosa L. 

 Kuhnislera purpurea (Vent.) MacM. 

 Xanthoxvlum americanum Mill. 

 Ptelea trifoliata L. 

 Polygala cruciata L. 



verticillata L. 

 " ambigua Nutt. 

 incarnata L. 



Polygala viridescens L. 

 " senega L. 

 " polygama Walt. 

 " paucifolia Willd. 

 Ascyrum hypericoides L. 

 Hypericum ascyron L. 



kalmianum L. 

 prolificum L. 

 adpressum Bart, 

 spaerocarpum ]\Iichx. 

 ellipticum Hook, 

 virgatum Lam. 

 maculatum Walt, 

 perforatum L. 

 subpetiolatum Bickn. 

 boreale (Britt.) Bickn 

 mutilum L. 

 gymnanthum Engelm. 



and Gray. 

 ma jus (Gr.) Britt. 

 drummondii (Grev. and 

 Hook.) T. and G. 

 Triadenum virginicum (L.) Raf. 

 Lysimachia quadrifolia L. 



terrcstris (L.) B. S. P. 

 " nummularia L. 



Naumbergia thyrsiflora (L.) Duby. 

 Grindelia squarrosa (Pursh )Dunal. 

 Euthamia gramini folia (L.) Xutt. 



" caroliniana (L.) Greene. 



Boebera papposa (Vent.) Rydb. 



