MIDDLESEX FLOEA. 97 



Thuta, 'I'oi™- 

 T. ocHdentalis, L. American Akbor-Vit^e. 

 Concord, introduced by Minot Pratt. May-June. 



Cham^ctpahis, Spach. 



C. sphaeroidea, Spach. (Cupressus thyoides, L., Man.) White 

 Cedajr. 



Beading, Bedford, Natick, Hopkinton, et al. Not very common. 

 May. 



JUNIPEKUS, L. 



J. communis, L. Juniper. 



Common. May-June. 

 J. Virginiana, L. Red Cedar. Savin. 



Common. May. 



TAX0S, Toum. 



T. baccata, li., var. Canadensis, Gray. 

 Amekican Yew. Geouni) Hemlock. 

 Common in Ashby (L. L. Dame) ; very rare elsewhere. Apr. 



ENDOGENS. 



ARACEvC. ARUM FAMILY. 



Aeis^ma, Mart. 



A. triphyllum, Torr. Indian Turnip. Jack-in-the-pulpit. 

 Common. May-June. 



Peltandra, Eaf. 



P. undulata, Eaf. (P. Virginica, Raf., Man., in part). 

 Not uncommon. June. 



Again separated, in Engler's Monograph, from P. Virginica, Raf. 

 The most obvious distinction is to be found in the spadix, the 

 pistillate part of whicli, in P. undulat^, is from 1-4 to 1-5, while in 

 P. Virginica, it is 2-3 the length of tlie staminate part. All the 

 county specimens examined seem to be P. uadulata. 



Calla, L. 



C. palustris, L. Water Ajkum. 

 Widely distributed, but not very common. May-June. 



